Add helm validator sources

Issue-ID: SDC-3185
Signed-off-by: Remigiusz Janeczek <remigiusz.janeczek@nokia.com>
Change-Id: I32dea3b4294a90c4dfc75864fb4200f044e7a0b6

50 files changed, 2986 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..23cc2f4
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,14 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+/scripts/helm_tmp/*
+/scripts/helm_versions/*
+
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..e22a242
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,25 @@
+FROM nexus3.onap.org:10001/onap/integration-java11:8.0.0
+
+ARG VERSION=${version}
+
+USER root
+RUN adduser -G onap -D validator
+
+RUN apk add --no-cache bash vim curl wget
+
+ENV HELM_SUPPORTED_VERSIONS=3.5.2,3.4.1,3.3.4,2.17.0,2.14.3
+
+#Installing Helm
+COPY scripts/collect_helm_versions_from_web.sh ./opt/helmvalidator/tmp/collect_helm_versions_from_web.sh
+RUN chmod +x ./opt/helmvalidator/tmp/collect_helm_versions_from_web.sh
+RUN ./opt/helmvalidator/tmp/collect_helm_versions_from_web.sh
+RUN rm -r ./opt/helmvalidator/tmp
+
+RUN mkdir /charts
+RUN chown -R validator:onap /charts
+
+USER validator:onap
+
+COPY target/sdc-helm-validator-${VERSION}.jar ./opt/helmvalidator/helmvalidator.jar
+
+ENTRYPOINT ["java","-XX:+UseParallelGC","-XX:MinRAMPercentage=50","-XX:MaxRAMPercentage=50","-XX:MinHeapFreeRatio=10","-XX:MaxHeapFreeRatio=20","-jar","./opt/helmvalidator/helmvalidator.jar"]
diff --git a/Dockerfile-local b/Dockerfile-local
new file mode 100644
index 0000000..b1b378a
--- /dev/null
+++ b/Dockerfile-local
@@ -0,0 +1,21 @@
+FROM nexus3.onap.org:10001/onap/integration-java11:8.0.0
+
+ARG VERSION=${version}
+ENV HELM_SUPPORTED_VERSIONS=${HELM_SUPPORTED_VERSIONS}
+
+USER root
+RUN adduser -G onap -D validator
+
+RUN apk add --no-cache bash vim curl wget
+
+#Installing Helm
+COPY scripts/helm_versions/* /usr/local/bin/
+
+RUN mkdir /charts
+RUN chown -R validator:onap /charts
+
+USER validator:onap
+
+COPY target/sdc-helm-validator-${VERSION}.jar ./opt/helmvalidator/helmvalidator.jar
+
+ENTRYPOINT ["java","-XX:+UseParallelGC","-XX:MinRAMPercentage=50","-XX:MaxRAMPercentage=50","-XX:MinHeapFreeRatio=10","-XX:MaxHeapFreeRatio=20","-jar","./opt/helmvalidator/helmvalidator.jar"]
diff --git a/Makefile b/Makefile
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index 0000000..a318769
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,18 @@
+build:
+	mvn clean install
+
+build-docker:
+	mvn clean install -Pdocker
+
+build-docker-local:
+	export HELM_SUPPORTED_VERSIONS=3.5.2,3.4.1,3.3.4,2.17.0 && \
+	cd scripts && \
+	./collect_helm_versions_from_web.sh local && \
+	cd ../ && \
+	mvn clean install -Pdocker-local
+
+clean-local-files:
+	rm -rf ./scripts/helm_tmp ./scripts/helm_versions
+
+run-docker:
+	docker run -p 8080:8080 onap/org.onap.sdc.sdc-helm-validator:latest
diff --git a/README.md b/README.md
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index 0000000..bb506c0
--- /dev/null
+++ b/README.md
@@ -0,0 +1,76 @@
+# helm-client-validator
+
+Docker container with Spring-Boot application for validating helm charts.
+
+#### Development
+To build image use:
+```
+make build-docker
+```
+or
+```
+make build-docker-local
+```
+
+To modify helm versions: 
+
+1. Modify `Dockerfile`, add desired version in line:
+```shell script
+ENV HELM_SUPPORTED_VERSIONS=3.5.2,3.4.1,3.3.4,2.17.0,2.14.3
+```
+2. In local development, edit file: `Makefile` and add desired version in lines:
+```shell script
+build-docker-local:
+	export HELM_SUPPORTED_VERSIONS=3.5.2,3.4.1,3.3.4,2.17.0
+```
+If you want to clean downloaded files run: `make clean-local-files`
+
+In order to run docker container locally use: 
+```
+make run-docker
+```
+Example charts are located in the following directory:
+```
+./charts
+```
+
+## Available endpoints
+* Chart validation:
+
+    `http://localhost:[PORT]/validate`
+
+#### Request
+This should be a POST with `multipart/form-data` encoding with the following fields:
+
+        "versionDesired": [String] - helm version, which will be used for validation. If param not provided then version will be taken from apiVersion
+        "file": [FILE] - helm chart to be validated packed in .txz format
+        "isLinted": ["true"/"false"] - if false, there will be an attempt to render the chart without linting it first        
+        "isStrictLinted": ["true"/"false"] - linting should be strict or not
+
+It is possible to provide helm version in three ways:
+1. Select exact version from supported versions e.g. "3.4.1"
+2. Select major helm version e.g. "v2" for Helm 2 or "v3" for Helm 3. In this case app will use the latest supported version.
+3. In case when field version is not present in request then app gets helm version from "apiVersion" field located in the main chart (Chart.yaml).
+Mapping rules:
+
+apiVersion: v1 -> the latest available helm 2
+
+apiVersion: v2 -> the latest available helm 3
+
+#### Response
+Json with the following fields:
+        
+        "valid": ["true"/"false"] - passed linting without errors
+        "deployable": ["true"/"false"] - passed template rendering without errors
+        "lintErrors": [ARRAY OF STRINGS] - linting errors
+        "lintWarnings": [ARRAY OF STRINGS] - linting warnings
+        "renderErrors": [ARRAY OF STRINGS] - rendering errors
+
+* Supported versions [GET]
+
+    `http://localhost:[PORT]/versions` 
+
+#### Response
+Following Json:
+
+        [ARRAY OF STRINGS] - supported helm versions
diff --git a/charts/correct-apiVersion-v1.tgz b/charts/correct-apiVersion-v1.tgz
new file mode 100644
index 0000000..9782071
--- /dev/null
+++ b/charts/correct-apiVersion-v1.tgz
diff --git a/charts/correct-apiVersion-v2.tgz b/charts/correct-apiVersion-v2.tgz
new file mode 100644
index 0000000..a1a99ba
--- /dev/null
+++ b/charts/correct-apiVersion-v2.tgz
diff --git a/charts/error-bad-chart-yaml.tar.gz b/charts/error-bad-chart-yaml.tar.gz
new file mode 100644
index 0000000..b7ce4e5
--- /dev/null
+++ b/charts/error-bad-chart-yaml.tar.gz
diff --git a/charts/one-lint-one-render-error-apiVersion-v1.tgz b/charts/one-lint-one-render-error-apiVersion-v1.tgz
new file mode 100644
index 0000000..d17c118
--- /dev/null
+++ b/charts/one-lint-one-render-error-apiVersion-v1.tgz
diff --git a/charts/one-lint-one-render-error-apiVersion-v2.tgz b/charts/one-lint-one-render-error-apiVersion-v2.tgz
new file mode 100644
index 0000000..874dd3c
--- /dev/null
+++ b/charts/one-lint-one-render-error-apiVersion-v2.tgz
diff --git a/charts/one-lint-warning-apiVersion-v2.tgz b/charts/one-lint-warning-apiVersion-v2.tgz
new file mode 100644
index 0000000..51f4dd1
--- /dev/null
+++ b/charts/one-lint-warning-apiVersion-v2.tgz
diff --git a/charts/two-lint-warnings-apiVersion-v1.tgz b/charts/two-lint-warnings-apiVersion-v1.tgz
new file mode 100644
index 0000000..54422c9
--- /dev/null
+++ b/charts/two-lint-warnings-apiVersion-v1.tgz
diff --git a/deployment.yaml b/deployment.yaml
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index 0000000..43b6f15
--- /dev/null
+++ b/deployment.yaml
@@ -0,0 +1,44 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: helm-client-validator
+  namespace: onap
+  labels:
+    app: helm-client-validator
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: helm-client-validator
+  template:
+    metadata:
+      labels:
+        app: helm-client-validator
+    spec:
+      containers:
+        - name: helm-client-validator
+          imagePullPolicy: IfNotPresent
+          image: onap-dev-local.esisoj70.emea.nsn-net.net/towrobel/helm-client-validator:1.5.0
+          resources:
+            requests:
+              memory: "256Mi"
+            limits:
+              memory: "256Mi"
+
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: helm-client-validator-service
+  namespace: onap
+  labels:
+    app: helm-client-validator
+spec:
+  selector:
+    app: helm-client-validator
+  type: NodePort
+  ports:
+    - port: 8244
+      targetPort: 8080
+      nodePort: 32244
diff --git a/pom.xml b/pom.xml
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index 0000000..d569680
--- /dev/null
+++ b/pom.xml
@@ -0,0 +1,176 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>org.onap.oparent</groupId>
+    <artifactId>oparent</artifactId>
+    <version>3.2.0</version>
+    <relativePath/>
+  </parent>
+  <groupId>org.onap.sdc</groupId>
+  <artifactId>sdc-helm-validator</artifactId>
+  <version>0.0.1-SNAPSHOT</version>
+  <name>helmvalidator</name>
+  <description>Spring-Boot application for validating helm charts</description>
+
+  <properties>
+    <java.version>11</java.version>
+
+    <maven.build.timestamp.format>yyyyMMdd'T'HHmmss</maven.build.timestamp.format>
+		<skipDockerPush>true</skipDockerPush>
+
+		<docker-maven-plugin.version>0.34.1</docker-maven-plugin.version>
+		<spring.version>2.4.3</spring.version>
+		<apache.commons.compress.version>1.20</apache.commons.compress.version>
+
+    <docker.dockerfile>Dockerfile</docker.dockerfile>
+    <docker-image.name>onap/${project.groupId}.${project.artifactId}</docker-image.name>
+    <docker-image.registry>${onap.nexus.dockerregistry.daily}</docker-image.registry>
+    <docker-image.tag.latest>latest</docker-image.tag.latest>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-actuator</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-web</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-test</artifactId>
+      <scope>test</scope>
+    </dependency>
+
+    <dependency>
+      <groupId>org.apache.commons</groupId>
+      <artifactId>commons-compress</artifactId>
+      <version>${apache.commons.compress.version}</version>
+    </dependency>
+
+  </dependencies>
+
+  <dependencyManagement>
+    <dependencies>
+      <dependency>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-dependencies</artifactId>
+        <version>${spring.version}</version>
+        <type>pom</type>
+        <scope>import</scope>
+      </dependency>
+    </dependencies>
+  </dependencyManagement>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-maven-plugin</artifactId>
+        <version>${spring.version}</version>
+        <executions>
+          <execution>
+            <goals>
+              <goal>repackage</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+      <plugin>
+        <groupId>io.fabric8</groupId>
+        <artifactId>docker-maven-plugin</artifactId>
+        <version>${docker-maven-plugin.version}</version>
+        <configuration>
+          <skipPush>${skipDockerPush}</skipPush>
+          <verbose>true</verbose>
+          <imagePullPolicy>IfNotPresent</imagePullPolicy>
+          <images>
+            <image>
+              <alias>${project.artifactId}</alias>
+              <name>${docker-image.name}:${docker-image.tag.latest}</name>
+              <registry>${docker-image.registry}</registry>
+              <build>
+                <dockerFile>${docker.dockerfile}</dockerFile>
+                <contextDir>${project.basedir}</contextDir>
+                <tags>
+                  <tag>${project.version}-${maven.build.timestamp}Z</tag>
+                </tags>
+              </build>
+            </image>
+          </images>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+
+  <profiles>
+<!--DEV-->
+    <profile>
+      <id>dev</id>
+      <dependencies>
+        <dependency>
+          <groupId>org.springframework.boot</groupId>
+          <artifactId>spring-boot-devtools</artifactId>
+          <optional>true</optional>
+        </dependency>
+      </dependencies>
+    </profile>
+
+<!--DOCKER-->
+    <profile>
+      <id>docker</id>
+      <activation>
+        <activeByDefault>false</activeByDefault>
+      </activation>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>io.fabric8</groupId>
+            <artifactId>docker-maven-plugin</artifactId>
+            <executions>
+              <execution>
+                <id>docker-build-image</id>
+                <phase>package</phase>
+                <goals>
+                  <goal>build</goal>
+                </goals>
+              </execution>
+            </executions>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+
+    <profile>
+      <id>docker-local</id>
+      <activation>
+        <activeByDefault>false</activeByDefault>
+      </activation>
+      <properties>
+        <docker.dockerfile>Dockerfile-local</docker.dockerfile>
+      </properties>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>io.fabric8</groupId>
+            <artifactId>docker-maven-plugin</artifactId>
+            <executions>
+              <execution>
+                <id>docker-build-image</id>
+                <phase>package</phase>
+                <goals>
+                  <goal>build</goal>
+                </goals>
+              </execution>
+            </executions>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+  </profiles>
+</project>
diff --git a/scripts/collect_helm_versions_from_web.sh b/scripts/collect_helm_versions_from_web.sh
new file mode 100755
index 0000000..6155149
--- /dev/null
+++ b/scripts/collect_helm_versions_from_web.sh
@@ -0,0 +1,43 @@
+#!/bin/bash
+
+set -e
+
+HELM_TMP_DIR=helm_tmp
+HELM_VERSIONS_DIR=helm_versions
+IS_LOCAL=false
+if [ "$1" == "local" ]; then
+  IS_LOCAL=true
+fi
+
+readarray -d , -t SUPPORTED_VERSION_ARRAY <<<"$HELM_SUPPORTED_VERSIONS"
+
+mkdir -p $HELM_VERSIONS_DIR
+mkdir -p $HELM_TMP_DIR
+
+getHelm() {
+  VERSION=$1
+  echo "Attempt to collect HELM ${VERSION}"
+
+  if [ -a "$HELM_VERSIONS_DIR/helm-v${VERSION}" ]; then
+    echo "HELM ${VERSION} already exists"
+  else
+    mkdir -p $HELM_TMP_DIR/v${VERSION}
+    echo "Downloading..."
+    wget -q https://get.helm.sh/helm-v${VERSION}-linux-amd64.tar.gz -O $HELM_TMP_DIR/helm-v${VERSION}.tar.gz
+    echo "Archive Extracting..."
+    tar -zxvf $HELM_TMP_DIR/helm-v${VERSION}.tar.gz -C $HELM_TMP_DIR/v${VERSION} linux-amd64/helm
+    mv $HELM_TMP_DIR/v${VERSION}/linux-amd64/helm $HELM_VERSIONS_DIR/helm-v${VERSION}
+  fi
+
+  echo "DONE"
+}
+
+for i in "${SUPPORTED_VERSION_ARRAY[@]}"; do
+  getHelm $i
+done
+
+if [ $IS_LOCAL == false ]; then
+  mv $HELM_VERSIONS_DIR/* /usr/local/bin/
+  rm -r $HELM_VERSIONS_DIR
+  rm -r $HELM_TMP_DIR
+fi
diff --git a/src/main/java/org/onap/sdc/helmvalidator/HelmValidatorApplication.java b/src/main/java/org/onap/sdc/helmvalidator/HelmValidatorApplication.java
new file mode 100644
index 0000000..b8bed69
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/HelmValidatorApplication.java
@@ -0,0 +1,33 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class HelmValidatorApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(HelmValidatorApplication.class, args);
+    }
+
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/api/SupportedVersionsController.java b/src/main/java/org/onap/sdc/helmvalidator/api/SupportedVersionsController.java
new file mode 100644
index 0000000..1a92624
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/api/SupportedVersionsController.java
@@ -0,0 +1,52 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.api;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import org.onap.sdc.helmvalidator.helm.versions.SupportedVersionsProvider;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class SupportedVersionsController {
+
+    private final SupportedVersionsProvider versionsProvider;
+
+    @Autowired
+    public SupportedVersionsController(SupportedVersionsProvider provider) {
+        this.versionsProvider = provider;
+    }
+
+    @GetMapping("/versions")
+    public ResponseEntity<Map<String, List<String>>> supportedVersions() {
+        return mapVersionsToResponseEntity(versionsProvider.getVersions());
+    }
+
+    private ResponseEntity<Map<String, List<String>>> mapVersionsToResponseEntity(List<String> versions) {
+
+        return new ResponseEntity<>(Collections.singletonMap("versions", versions), HttpStatus.OK);
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/api/ValidationController.java b/src/main/java/org/onap/sdc/helmvalidator/api/ValidationController.java
new file mode 100644
index 0000000..a4e476c
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/api/ValidationController.java
@@ -0,0 +1,68 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.api;
+
+import org.onap.sdc.helmvalidator.helm.validation.ValidationService;
+import org.onap.sdc.helmvalidator.helm.validation.model.ValidationResult;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.multipart.MultipartFile;
+
+@RestController
+public class ValidationController {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(ValidationController.class);
+
+    private final ValidationService validationService;
+
+    @Autowired
+    public ValidationController(ValidationService validationService) {
+        this.validationService = validationService;
+    }
+
+    /**
+     * Validates Helm chart.
+     *
+     * @param version        requested version of Helm client to be used
+     * @param file           packaged Helm chart file
+     * @param isLinted       flag deciding if chart should be linted
+     * @param isStrictLinted flag deciding if chart should be linted with strict option turned on
+     * @return Response with result of validation
+     */
+    @PostMapping("/validate")
+    public ResponseEntity<ValidationResult> validate(
+        @RequestParam(value = "versionDesired", required = false) String version,
+        @RequestParam("file") MultipartFile file,
+        @RequestParam(value = "isLinted", required = false, defaultValue = "false") boolean isLinted,
+        @RequestParam(value = "isStrictLinted", required = false, defaultValue = "false") boolean isStrictLinted) {
+        LOGGER.debug("Received file: {}, size: {}, helm version: {}",
+            file.getOriginalFilename(), file.getSize(), version);
+        ValidationResult result = validationService
+            .process(version, file, isLinted, isStrictLinted);
+        return new ResponseEntity<>(result, HttpStatus.OK);
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/errorhandling/ValidationErrorHandler.java b/src/main/java/org/onap/sdc/helmvalidator/errorhandling/ValidationErrorHandler.java
new file mode 100644
index 0000000..332a923
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/errorhandling/ValidationErrorHandler.java
@@ -0,0 +1,129 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.errorhandling;
+
+import org.onap.sdc.helmvalidator.api.ValidationController;
+import org.onap.sdc.helmvalidator.helm.validation.exception.BashExecutionException;
+import org.onap.sdc.helmvalidator.helm.validation.exception.NotSupportedVersionException;
+import org.onap.sdc.helmvalidator.helm.validation.exception.SaveFileException;
+import org.onap.sdc.helmvalidator.helm.versions.exception.ApiVersionNotFoundException;
+import org.onap.sdc.helmvalidator.helm.versions.exception.NotSupportedApiVersionException;
+import org.onap.sdc.helmvalidator.helm.versions.exception.ReadFileException;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@RestControllerAdvice(assignableTypes = ValidationController.class)
+public class ValidationErrorHandler {
+
+    /**
+     * BashExecutionException handler.
+     *
+     * @param exception Exception that occurs during execution of bash command
+     * @return ResponseEntity with ValidationErrorResponse created from given exception
+     */
+    @ExceptionHandler(value = BashExecutionException.class)
+    public ResponseEntity<ValidationErrorResponse> handle(BashExecutionException exception) {
+        return getErrorResponseEntity(
+            exception.getMessage(),
+            HttpStatus.INTERNAL_SERVER_ERROR
+        );
+    }
+
+    /**
+     * SaveFileException handler.
+     *
+     * @param exception Exception that occurs during file saving
+     * @return ResponseEntity with ValidationErrorResponse created from given exception
+     */
+    @ExceptionHandler(value = SaveFileException.class)
+    public ResponseEntity<ValidationErrorResponse> handle(SaveFileException exception) {
+        return getErrorResponseEntity(
+            exception.getMessage(),
+            HttpStatus.INTERNAL_SERVER_ERROR
+        );
+    }
+
+    /**
+     * NotSupportedVersionException handler.
+     *
+     * @param exception Exception that occurs when not supported Helm version is requested for validation
+     * @return ResponseEntity with ValidationErrorResponse created from given exception
+     */
+    @ExceptionHandler(value = NotSupportedVersionException.class)
+    public ResponseEntity<ValidationErrorResponse> handle(NotSupportedVersionException exception) {
+        return getErrorResponseEntity(
+            exception.getMessage(),
+            HttpStatus.BAD_REQUEST
+        );
+    }
+
+    /**
+     * ApiVersionNotFoundException handler.
+     *
+     * @param exception Exception that occurs when API version cannot be derived from Helm chart
+     * @return ResponseEntity with ValidationErrorResponse created from given exception
+     */
+    @ExceptionHandler(value = ApiVersionNotFoundException.class)
+    public ResponseEntity<ValidationErrorResponse> handle(ApiVersionNotFoundException exception) {
+        return getErrorResponseEntity(
+            exception.getMessage(),
+            HttpStatus.BAD_REQUEST
+        );
+    }
+
+    /**
+     * NotSupportedApiVersionException handler.
+     *
+     * @param exception Exception that occurs when API version from Helm chart is not supported
+     * @return ResponseEntity with ValidationErrorResponse created from given exception
+     */
+    @ExceptionHandler(value = NotSupportedApiVersionException.class)
+    public ResponseEntity<ValidationErrorResponse> handle(NotSupportedApiVersionException exception) {
+        return getErrorResponseEntity(
+            exception.getMessage(),
+            HttpStatus.BAD_REQUEST
+        );
+    }
+
+    /**
+     * ReadFileException handler.
+     *
+     * @param exception Exception that occurs during reading of Helm chart
+     * @return ResponseEntity with ValidationErrorResponse created from given exception
+     */
+    @ExceptionHandler(value = ReadFileException.class)
+    public ResponseEntity<ValidationErrorResponse> handle(ReadFileException exception) {
+        return getErrorResponseEntity(
+            exception.getMessage(),
+            HttpStatus.INTERNAL_SERVER_ERROR
+        );
+    }
+
+    private ResponseEntity<ValidationErrorResponse> getErrorResponseEntity(String errorMessage, HttpStatus status) {
+        ValidationErrorResponse errorResponse = new ValidationErrorResponse(errorMessage);
+        return new ResponseEntity<>(
+            errorResponse,
+            status
+        );
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/errorhandling/ValidationErrorResponse.java b/src/main/java/org/onap/sdc/helmvalidator/errorhandling/ValidationErrorResponse.java
new file mode 100644
index 0000000..0f1fded
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/errorhandling/ValidationErrorResponse.java
@@ -0,0 +1,34 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.errorhandling;
+
+class ValidationErrorResponse {
+
+    private final String message;
+
+    ValidationErrorResponse(String message) {
+        this.message = message;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/validation/BashExecutor.java b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/BashExecutor.java
new file mode 100644
index 0000000..0bebc0a
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/BashExecutor.java
@@ -0,0 +1,69 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.List;
+import java.util.stream.Collectors;
+import org.onap.sdc.helmvalidator.helm.validation.exception.BashExecutionException;
+import org.onap.sdc.helmvalidator.helm.validation.model.BashOutput;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.stereotype.Service;
+
+@Service
+public class BashExecutor {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(
+        ValidationService.class);
+
+    BashOutput execute(String helmCommand) {
+
+        try {
+            ProcessBuilder pb = new ProcessBuilder("bash", "-c", helmCommand);
+            pb.redirectErrorStream(true);
+            LOGGER.debug("Start process");
+            Process process = pb.start();
+
+            List<String> processOutput = readOutputAndCloseProcess(process);
+            return new BashOutput(process.exitValue(), processOutput);
+        } catch (IOException | InterruptedException e) {
+            throw new BashExecutionException("Error during bash execution: ", e);
+        }
+    }
+
+    private List<String> readOutputAndCloseProcess(Process process) throws IOException, InterruptedException {
+
+        final InputStream inputStream = process.getInputStream();
+        final List<String> lines = new BufferedReader(new InputStreamReader(inputStream))
+            .lines().collect(Collectors.toList());
+
+        // For compatibility with Helm2 and Helm3
+        process.waitFor();
+        inputStream.close();
+        process.destroy();
+
+        return lines;
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/validation/FileManager.java b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/FileManager.java
new file mode 100644
index 0000000..3617df7
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/FileManager.java
@@ -0,0 +1,72 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.nio.file.StandardCopyOption;
+import java.time.Instant;
+import org.onap.sdc.helmvalidator.helm.validation.exception.SaveFileException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+import org.springframework.web.multipart.MultipartFile;
+
+@Service
+public class FileManager {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(FileManager.class);
+    private final String basePath;
+
+    @Autowired
+    FileManager(@Value("${app.config.charts-base-path}") String basePath) {
+        this.basePath = basePath;
+    }
+
+    String saveFile(MultipartFile file) {
+        LOGGER.debug("Base PATH: {}", basePath);
+        try {
+            String filePath = basePath + File.separator + generateFileName(file.getOriginalFilename());
+            LOGGER.info("Attempt to save file : {}", filePath);
+            Files.copy(file.getInputStream(), Paths.get(filePath), StandardCopyOption.REPLACE_EXISTING);
+            return filePath;
+        } catch (IOException e) {
+            throw new SaveFileException("Cannot save file: " + file.getOriginalFilename(), e);
+        }
+    }
+
+    void removeFile(String path) {
+        try {
+            LOGGER.debug("Attempt to delete file : {}", path);
+            Files.deleteIfExists(Paths.get(path));
+        } catch (IOException e) {
+            LOGGER.warn("Cannot delete file: {}, Exception: {}", path, e.getStackTrace());
+        }
+    }
+
+    private String generateFileName(String fileName) {
+        return Instant.now().toEpochMilli() + "_" + fileName;
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/validation/ValidationService.java b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/ValidationService.java
new file mode 100644
index 0000000..1e6cedb
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/ValidationService.java
@@ -0,0 +1,221 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+import org.onap.sdc.helmvalidator.helm.validation.exception.BashExecutionException;
+import org.onap.sdc.helmvalidator.helm.validation.exception.NotSupportedVersionException;
+import org.onap.sdc.helmvalidator.helm.validation.model.BashOutput;
+import org.onap.sdc.helmvalidator.helm.validation.model.LintValidationResult;
+import org.onap.sdc.helmvalidator.helm.validation.model.TemplateValidationResult;
+import org.onap.sdc.helmvalidator.helm.validation.model.ValidationResult;
+import org.onap.sdc.helmvalidator.helm.versions.ChartBasedVersionProvider;
+import org.onap.sdc.helmvalidator.helm.versions.SupportedVersionsProvider;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.web.multipart.MultipartFile;
+
+@Service
+public class ValidationService {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(ValidationService.class);
+    private static final String TEMPLATE_OPTION = "template";
+    private static final String LINT_OPTION = "lint";
+    private static final String HELM_SUMMARY_MESSAGE_PATTERN =
+        "Error: \\d* chart\\(s\\) linted, \\d* chart\\(s\\) failed";
+    private static final boolean INVALID_RESULT = false;
+
+    private final FileManager fileManager;
+
+    private final BashExecutor executor;
+
+    private final SupportedVersionsProvider supportedVersionsProvider;
+
+    private final ChartBasedVersionProvider chartBasedVersionProvider;
+
+
+    /**
+     * Constructor for ValidationService.
+     *
+     * @param fileManager               object responsible for file manging
+     * @param executor                  object responsible for running shell commands
+     * @param supportedVersionsProvider object providing supported versions of Helm
+     * @param chartBasedVersionProvider object allowing to derive Helm version from a chart
+     */
+    @Autowired
+    public ValidationService(
+        FileManager fileManager, BashExecutor executor,
+        SupportedVersionsProvider supportedVersionsProvider,
+        ChartBasedVersionProvider chartBasedVersionProvider) {
+        this.fileManager = fileManager;
+        this.executor = executor;
+        this.supportedVersionsProvider = supportedVersionsProvider;
+        this.chartBasedVersionProvider = chartBasedVersionProvider;
+    }
+
+    /**
+     * Process Helm chart package with given options.
+     *
+     * @param desiredVersion requested version of Helm client to be used
+     * @param file           packaged Helm chart file
+     * @param isLinted       flag deciding if chart should be linted
+     * @param isStrictLinted flag deciding if chart should be linted with strict option turned on
+     * @return Result of Helm chart validation
+     */
+    public ValidationResult process(String desiredVersion, MultipartFile file, boolean isLinted,
+        boolean isStrictLinted) {
+        String chartPath = fileManager.saveFile(file);
+        try {
+            String helmVersion = getSupportedHelmVersion(desiredVersion, chartPath);
+            return validateChart(helmVersion, file, isLinted, isStrictLinted, chartPath);
+        } finally {
+            LOGGER.info("File process finished");
+            fileManager.removeFile(chartPath);
+        }
+    }
+
+    private String getSupportedHelmVersion(String desiredVersion, String chartPath) {
+        String helmVersion = getHelmVersion(desiredVersion, chartPath);
+
+        if (isNotSupportedVersion(helmVersion)) {
+            throw new NotSupportedVersionException(helmVersion);
+        }
+
+        return helmVersion;
+    }
+
+    private String getHelmVersion(String desiredVersion, String chartPath) {
+        if (desiredVersion == null) {
+            return chartBasedVersionProvider.getVersion(chartPath);
+        }
+
+        if (desiredVersion.startsWith("v")) {
+            String helmMajorVersion = desiredVersion.substring(1);
+            return supportedVersionsProvider.getLatestVersion(helmMajorVersion);
+        }
+
+        return desiredVersion;
+    }
+
+    private ValidationResult validateChart(String version, MultipartFile file, boolean isLinted, boolean isStrictLinted,
+        String chartPath) {
+        LOGGER.info("Start validation of file: {}, with helm version: {}",
+            file.getOriginalFilename(), version);
+
+        TemplateValidationResult templateValidationResult = runHelmTemplate(
+            buildHelmTemplateCommand(version, chartPath));
+        LOGGER.info("Helm template finished");
+
+        if (isLinted) {
+            LOGGER.info("Start helm lint, strict: {}", isStrictLinted);
+            LintValidationResult lintValidationResult = runHelmLint(
+                buildHelmLintCommand(version, chartPath, isStrictLinted));
+            LOGGER.info("Helm lint finished");
+            return new ValidationResult(templateValidationResult, lintValidationResult, version);
+        }
+
+        return new ValidationResult(templateValidationResult, version);
+    }
+
+    private boolean isNotSupportedVersion(String version) {
+        return !supportedVersionsProvider.getVersions().contains(version);
+    }
+
+
+    private String buildHelmTemplateCommand(String version, String chartPath) {
+        return "helm-v" + version + " " + TEMPLATE_OPTION + " " + chartPath;
+    }
+
+    private TemplateValidationResult runHelmTemplate(String helmCommand)
+        throws BashExecutionException {
+
+        LOGGER.debug("Command executions: {} ", helmCommand);
+        BashOutput chartTemplateResult = executor.execute(helmCommand);
+        LOGGER.debug("Status code: " + chartTemplateResult.getExitValue());
+        if (chartTemplateResult.getExitValue() != 0) {
+            List<String> renderingErrors = parseTemplateError(chartTemplateResult.getOutputLines());
+            return new TemplateValidationResult(false, renderingErrors);
+        }
+        return new TemplateValidationResult(true, Collections.emptyList());
+    }
+
+    private String buildHelmLintCommand(String version, String chartPath, boolean isStrictLint) {
+        String command = "helm-v" + version + " " + LINT_OPTION + " " + chartPath;
+        if (isStrictLint) {
+            return command + " --strict";
+        }
+        return command;
+    }
+
+    private LintValidationResult runHelmLint(String helmCommand) {
+        BashOutput chartLintResult = executor.execute(helmCommand);
+
+        List<String> lintErrors = parseLintError(chartLintResult.getOutputLines());
+        List<String> lintWarnings = parseWarningError(chartLintResult.getOutputLines());
+
+        boolean isSuccessExitStatus = isSuccessExitStatus(chartLintResult.getExitValue());
+
+        if (isInvalidWithoutStandardError(isSuccessExitStatus, lintErrors, lintWarnings)) {
+            return new LintValidationResult(INVALID_RESULT, chartLintResult.getOutputLines(), new ArrayList<>());
+        }
+
+        return new LintValidationResult(isSuccessExitStatus, lintErrors, lintWarnings);
+    }
+
+    private boolean isInvalidWithoutStandardError(boolean isValid, List<String> lintErrors, List<String> lintWarnings) {
+        return !isValid && lintErrors.isEmpty() && lintWarnings.isEmpty();
+    }
+
+    private boolean isSuccessExitStatus(int exitValue) {
+        return exitValue == 0;
+    }
+
+    private List<String> parseTemplateError(List<String> outputLines) {
+
+        return outputLines.stream()
+            .filter(s -> s.startsWith("Error:"))
+            .collect(Collectors.toList());
+    }
+
+    private List<String> parseWarningError(List<String> outputLines) {
+        return outputLines.stream()
+            .filter(s -> s.startsWith("[WARNING]"))
+            .collect(Collectors.toList());
+    }
+
+    private List<String> parseLintError(List<String> outputLines) {
+        return outputLines.stream()
+            .filter(s -> s.startsWith("[ERROR]") || s.startsWith("Error"))
+            .filter(this::isNotHelmSummaryMessage)
+            .collect(Collectors.toList());
+    }
+
+    private boolean isNotHelmSummaryMessage(String line) {
+        Pattern pattern = Pattern.compile(HELM_SUMMARY_MESSAGE_PATTERN);
+        return !pattern.matcher(line).matches();
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/validation/exception/BashExecutionException.java b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/exception/BashExecutionException.java
new file mode 100644
index 0000000..2d70d39
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/exception/BashExecutionException.java
@@ -0,0 +1,28 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation.exception;
+
+public class BashExecutionException extends RuntimeException {
+
+    public BashExecutionException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/validation/exception/NotSupportedVersionException.java b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/exception/NotSupportedVersionException.java
new file mode 100644
index 0000000..753a08d
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/exception/NotSupportedVersionException.java
@@ -0,0 +1,28 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation.exception;
+
+public class NotSupportedVersionException extends RuntimeException {
+
+    public NotSupportedVersionException(String version) {
+        super("Version: " + version + " is not supported");
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/validation/exception/SaveFileException.java b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/exception/SaveFileException.java
new file mode 100644
index 0000000..cdb9079
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/exception/SaveFileException.java
@@ -0,0 +1,28 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation.exception;
+
+public class SaveFileException extends RuntimeException {
+
+    public SaveFileException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/BashOutput.java b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/BashOutput.java
new file mode 100644
index 0000000..88942e5
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/BashOutput.java
@@ -0,0 +1,43 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation.model;
+
+import java.util.List;
+
+public class BashOutput {
+
+    private final int exitValue;
+
+    private final List<String> outputLines;
+
+    public BashOutput(int exitValue, List<String> outputLines) {
+        this.exitValue = exitValue;
+        this.outputLines = outputLines;
+    }
+
+    public int getExitValue() {
+        return exitValue;
+    }
+
+    public List<String> getOutputLines() {
+        return outputLines;
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/LintValidationResult.java b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/LintValidationResult.java
new file mode 100644
index 0000000..09cbe36
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/LintValidationResult.java
@@ -0,0 +1,55 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation.model;
+
+import java.util.List;
+
+public class LintValidationResult {
+
+    private final boolean isValid;
+
+    private final List<String> lintErrors;
+    private final List<String> lintWarnings;
+
+    /**
+     * Validation result of linting a Helm chart.
+     * @param isValid flag indicating if chart is valid
+     * @param lintErrors list of errors occurred during linting
+     * @param lintWarnings list of warning occurred during linting
+     */
+    public LintValidationResult(boolean isValid, List<String> lintErrors, List<String> lintWarnings) {
+        this.isValid = isValid;
+        this.lintErrors = lintErrors;
+        this.lintWarnings = lintWarnings;
+    }
+
+    boolean isValid() {
+        return isValid;
+    }
+
+    List<String> getLintErrors() {
+        return lintErrors;
+    }
+
+    List<String> getLintWarnings() {
+        return lintWarnings;
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/TemplateValidationResult.java b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/TemplateValidationResult.java
new file mode 100644
index 0000000..1ba20f9
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/TemplateValidationResult.java
@@ -0,0 +1,48 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation.model;
+
+import java.util.List;
+
+public class TemplateValidationResult {
+
+    private final boolean isDeployable;
+
+    private final List<String> renderErrors;
+
+    /**
+     * Validation result of templating a Helm chart.
+     * @param isDeployable flag indicating if chart can be templated
+     * @param renderErrors list of errors occurred during templating
+     */
+    public TemplateValidationResult(boolean isDeployable, List<String> renderErrors) {
+        this.isDeployable = isDeployable;
+        this.renderErrors = renderErrors;
+    }
+
+    boolean isDeployable() {
+        return isDeployable;
+    }
+
+    List<String> getRenderErrors() {
+        return renderErrors;
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/ValidationResult.java b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/ValidationResult.java
new file mode 100644
index 0000000..bb4fccc
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/ValidationResult.java
@@ -0,0 +1,98 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation.model;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Optional;
+
+public class ValidationResult {
+
+    private final Boolean isDeployable;
+    private final List<String> renderErrors;
+    private final Boolean isValid;
+    private final List<String> lintWarning;
+    private final List<String> lintError;
+    private final String versionUsed;
+
+
+    /**
+     * ValidationResult constructor when linting is enabled.
+     * @param templateValidationResult result of helm chart templating
+     * @param lintValidationResult result of helm chart linting
+     * @param versionUsed version of helm client used
+     */
+    public ValidationResult(
+        TemplateValidationResult templateValidationResult,
+        LintValidationResult lintValidationResult,
+        String versionUsed) {
+        this.isDeployable = templateValidationResult.isDeployable();
+        this.renderErrors = templateValidationResult.getRenderErrors();
+
+        this.isValid = lintValidationResult.isValid();
+        this.lintWarning = lintValidationResult.getLintWarnings();
+        this.lintError = lintValidationResult.getLintErrors();
+        this.versionUsed = versionUsed;
+    }
+
+    /**
+     * ValidationResult constructor when linting is disabled.
+     * @param templateValidationResult result of helm chart templating
+     * @param versionUsed version of helm client used
+     */
+    public ValidationResult(
+        TemplateValidationResult templateValidationResult, String versionUsed) {
+        this.isDeployable = templateValidationResult.isDeployable();
+        this.renderErrors = templateValidationResult.getRenderErrors();
+
+        this.isValid = null;
+        this.lintWarning = null;
+        this.lintError = null;
+        this.versionUsed = versionUsed;
+    }
+
+    public Boolean isDeployable() {
+        return isDeployable;
+    }
+
+    public List<String> getRenderErrors() {
+        return Optional.ofNullable(renderErrors)
+            .map(Collections::unmodifiableList).orElse(null);
+    }
+
+    public Boolean isValid() {
+        return isValid;
+    }
+
+    public List<String> getLintWarning() {
+        return Optional.ofNullable(lintWarning)
+            .map(Collections::unmodifiableList).orElse(null);
+    }
+
+    public List<String> getLintError() {
+        return Optional.ofNullable(lintError)
+            .map(Collections::unmodifiableList).orElse(null);
+    }
+
+    public String getVersionUsed() {
+        return versionUsed;
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/versions/ApiVersionsReader.java b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/ApiVersionsReader.java
new file mode 100644
index 0000000..e5c1a2e
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/ApiVersionsReader.java
@@ -0,0 +1,80 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.versions;
+
+import java.io.BufferedReader;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.nio.file.Path;
+import java.util.Optional;
+import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
+import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
+import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
+import org.onap.sdc.helmvalidator.helm.versions.exception.ApiVersionNotFoundException;
+import org.onap.sdc.helmvalidator.helm.versions.exception.ReadFileException;
+import org.springframework.stereotype.Service;
+
+@Service
+public class ApiVersionsReader {
+
+    private static final int MAIN_CHART_DIR_DEPTH = 2;
+    private static final String API_VERSION_PREFIX = "apiVersion:";
+    private static final Path CHART_FILE_NAME = Path.of("Chart.yaml");
+
+    String readVersion(String chartPath) {
+        return tryReadVersionFromChart(chartPath)
+            .orElseThrow(ApiVersionNotFoundException::new);
+    }
+
+    private Optional<String> tryReadVersionFromChart(String chartPath) {
+        try (TarArchiveInputStream tarInput = new TarArchiveInputStream(
+            new GzipCompressorInputStream(new FileInputStream(chartPath)))) {
+            return readVersionFromChart(tarInput);
+        } catch (IOException e) {
+            throw new ReadFileException("Cannot read tar from path: " + chartPath, e);
+        }
+    }
+
+    private Optional<String> readVersionFromChart(TarArchiveInputStream tarInput) throws IOException {
+        TarArchiveEntry currentEntry;
+        while ((currentEntry = tarInput.getNextTarEntry()) != null) {
+            if (isMainChartYaml(currentEntry)) {
+                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(tarInput));
+                return bufferedReader.lines()
+                    .filter(chartLine -> chartLine.contains(API_VERSION_PREFIX))
+                    .map(apiVersionLine -> apiVersionLine.replaceAll(API_VERSION_PREFIX, ""))
+                    .map(String::trim)
+                    .findFirst();
+            }
+        }
+        return Optional.empty();
+    }
+
+    private boolean isMainChartYaml(TarArchiveEntry currentEntry) {
+        Path entryPath = Path.of(currentEntry.getName());
+        return currentEntry.isFile()
+            && CHART_FILE_NAME.equals(entryPath.getFileName())
+            && (entryPath.getNameCount() == MAIN_CHART_DIR_DEPTH);
+    }
+
+
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/versions/ChartBasedVersionProvider.java b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/ChartBasedVersionProvider.java
new file mode 100644
index 0000000..b892a33
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/ChartBasedVersionProvider.java
@@ -0,0 +1,57 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.versions;
+
+import org.onap.sdc.helmvalidator.helm.versions.exception.NotSupportedApiVersionException;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class ChartBasedVersionProvider {
+
+    private final SupportedVersionsProvider supportedVersionsProvider;
+    private final ApiVersionsReader apiVersionsReader;
+
+    @Autowired
+    public ChartBasedVersionProvider(
+        SupportedVersionsProvider supportedVersionsProvider,
+        ApiVersionsReader apiVersionsReader) {
+        this.supportedVersionsProvider = supportedVersionsProvider;
+        this.apiVersionsReader = apiVersionsReader;
+    }
+
+    public String getVersion(String chartPath) {
+        String apiVersion = apiVersionsReader.readVersion(chartPath);
+        return mapToChartVersion(apiVersion);
+    }
+
+    private String mapToChartVersion(String apiVersion) {
+        switch (apiVersion) {
+            case "v1":
+                return supportedVersionsProvider.getLatestVersion("2");
+            case "v2":
+                return supportedVersionsProvider.getLatestVersion("3");
+            default:
+                throw new NotSupportedApiVersionException("Cannot obtain Helm version from API version: " + apiVersion);
+        }
+    }
+
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/versions/SupportedVersionsProvider.java b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/SupportedVersionsProvider.java
new file mode 100644
index 0000000..ff1cdde
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/SupportedVersionsProvider.java
@@ -0,0 +1,65 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.versions;
+
+import java.util.Comparator;
+import java.util.List;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+import org.onap.sdc.helmvalidator.helm.validation.exception.NotSupportedVersionException;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class SupportedVersionsProvider {
+
+    private final SystemEnvVersionsReader versionsReader;
+
+    @Autowired
+    public SupportedVersionsProvider(SystemEnvVersionsReader versionsReader) {
+        this.versionsReader = versionsReader;
+    }
+
+    /**
+     * Retrieves list of available Helm client versions.
+     *
+     * @return list of available Helm client versions
+     */
+    public List<String> getVersions() {
+        return versionsReader.readVersions().stream()
+            .filter(Predicate.not(String::isBlank))
+            .sorted(Comparator.reverseOrder())
+            .collect(Collectors.toList());
+    }
+
+    /**
+     * Retrieves latest available Helm client with given major version.
+     *
+     * @param helmMajorVersion major version of Helm client
+     * @return latest available Helm client with given major version
+     */
+    public String getLatestVersion(String helmMajorVersion) {
+        return getVersions().stream()
+            .filter(supportedVersion -> supportedVersion.startsWith(helmMajorVersion + "."))
+            .findFirst()
+            .orElseThrow(() -> new NotSupportedVersionException(helmMajorVersion));
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/versions/SystemEnvVersionsReader.java b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/SystemEnvVersionsReader.java
new file mode 100644
index 0000000..8cccd2b
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/SystemEnvVersionsReader.java
@@ -0,0 +1,47 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.versions;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Optional;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+import org.springframework.stereotype.Service;
+
+@Service
+public class SystemEnvVersionsReader {
+
+    private static final String HELM_SUPPORTED_VERSIONS = "HELM_SUPPORTED_VERSIONS";
+    private static final String DELIMITER = ",";
+
+    List<String> readVersions() {
+        return Arrays.stream(getSupportedVersionsFromEnv()
+            .split(DELIMITER))
+            .filter(Predicate.not(String::isBlank))
+            .collect(Collectors.toList());
+    }
+
+    String getSupportedVersionsFromEnv() {
+        return Optional.ofNullable(System.getenv(HELM_SUPPORTED_VERSIONS))
+            .orElse("");
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/versions/exception/ApiVersionNotFoundException.java b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/exception/ApiVersionNotFoundException.java
new file mode 100644
index 0000000..fadcc2a
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/exception/ApiVersionNotFoundException.java
@@ -0,0 +1,29 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.versions.exception;
+
+public class ApiVersionNotFoundException extends RuntimeException {
+
+    public ApiVersionNotFoundException() {
+        super("Cannot find apiVersion value in a main chart");
+    }
+
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/versions/exception/NotSupportedApiVersionException.java b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/exception/NotSupportedApiVersionException.java
new file mode 100644
index 0000000..368f9f1
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/exception/NotSupportedApiVersionException.java
@@ -0,0 +1,28 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.versions.exception;
+
+public class NotSupportedApiVersionException extends RuntimeException {
+
+    public NotSupportedApiVersionException(String message) {
+        super(message);
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/versions/exception/ReadFileException.java b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/exception/ReadFileException.java
new file mode 100644
index 0000000..a6a1ec4
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/exception/ReadFileException.java
@@ -0,0 +1,28 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.versions.exception;
+
+public class ReadFileException extends RuntimeException {
+
+    public ReadFileException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}
diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties
new file mode 100644
index 0000000..3fef31f
--- /dev/null
+++ b/src/main/resources/application.properties
@@ -0,0 +1,4 @@
+logging.level.web="ERROR"
+spring.mvc.log-request-details=false
+app.config.charts-base-path=/charts
+spring.jackson.default-property-inclusion=NON_NULL
diff --git a/src/test/java/org/onap/sdc/helmvalidator/HelmValidatorApplicationTests.java b/src/test/java/org/onap/sdc/helmvalidator/HelmValidatorApplicationTests.java
new file mode 100644
index 0000000..5b81936
--- /dev/null
+++ b/src/test/java/org/onap/sdc/helmvalidator/HelmValidatorApplicationTests.java
@@ -0,0 +1,33 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class HelmValidatorApplicationTests {
+
+    @Test
+    void contextLoads() {
+    }
+
+}
diff --git a/src/test/java/org/onap/sdc/helmvalidator/api/SupportedVersionsControllerTest.java b/src/test/java/org/onap/sdc/helmvalidator/api/SupportedVersionsControllerTest.java
new file mode 100644
index 0000000..ef93a90
--- /dev/null
+++ b/src/test/java/org/onap/sdc/helmvalidator/api/SupportedVersionsControllerTest.java
@@ -0,0 +1,67 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.api;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.when;
+
+import java.util.List;
+import java.util.Map;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.onap.sdc.helmvalidator.helm.versions.SupportedVersionsProvider;
+import org.springframework.http.ResponseEntity;
+
+@ExtendWith(MockitoExtension.class)
+class SupportedVersionsControllerTest {
+
+    private static final String SAMPLE_VERSION1 = "3.4.1";
+    private static final String SAMPLE_VERSION2 = "3.3.4";
+    private static final String SAMPLE_VERSION3 = "2.17.0";
+    private static final String VERSIONS = "versions";
+    private static final int EXPECTED_SIZE = 3;
+
+    private SupportedVersionsController supportedVersionsController;
+
+    @Mock
+    private SupportedVersionsProvider versionsProvider;
+
+    @BeforeEach
+    void setUp() {
+        supportedVersionsController = new SupportedVersionsController(versionsProvider);
+    }
+
+    @Test
+    void shouldReturnVersions() {
+        when(versionsProvider.getVersions()).thenReturn(List.of(SAMPLE_VERSION1, SAMPLE_VERSION2, SAMPLE_VERSION3));
+
+        ResponseEntity<Map<String, List<String>>> supportedVersionsResponse = supportedVersionsController
+            .supportedVersions();
+        List<String> supportedVersions = supportedVersionsResponse.getBody().get(VERSIONS);
+
+        assertThat(supportedVersions).isNotNull();
+        assertThat(supportedVersions).hasSize(EXPECTED_SIZE);
+        assertThat(supportedVersions).contains(SAMPLE_VERSION1, SAMPLE_VERSION2, SAMPLE_VERSION3);
+    }
+}
diff --git a/src/test/java/org/onap/sdc/helmvalidator/api/ValidationControllerTest.java b/src/test/java/org/onap/sdc/helmvalidator/api/ValidationControllerTest.java
new file mode 100644
index 0000000..03f976a
--- /dev/null
+++ b/src/test/java/org/onap/sdc/helmvalidator/api/ValidationControllerTest.java
@@ -0,0 +1,195 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.api;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.mockito.Mockito.when;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.multipart;
+
+import java.util.ArrayList;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.onap.sdc.helmvalidator.helm.validation.ValidationService;
+import org.onap.sdc.helmvalidator.helm.validation.exception.BashExecutionException;
+import org.onap.sdc.helmvalidator.helm.validation.exception.NotSupportedVersionException;
+import org.onap.sdc.helmvalidator.helm.validation.exception.SaveFileException;
+import org.onap.sdc.helmvalidator.helm.validation.model.LintValidationResult;
+import org.onap.sdc.helmvalidator.helm.validation.model.TemplateValidationResult;
+import org.onap.sdc.helmvalidator.helm.validation.model.ValidationResult;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.mock.web.MockMultipartFile;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.MvcResult;
+import org.springframework.web.multipart.MultipartFile;
+
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.MOCK)
+@AutoConfigureMockMvc
+@ExtendWith(SpringExtension.class)
+@ExtendWith(MockitoExtension.class)
+class ValidationControllerTest {
+
+    private static final String SAMPLE_VERSION = "3.3.4";
+    private static final String VERSION_PARAM = "versionDesired";
+    private static final String IS_LINTED_PARAM = "isLinted";
+    private static final String IS_STRICT_LINTED_PARAM = "isStrictLinted";
+    private static final String VALID = "valid";
+    private static final String DEPLOYABLE = "deployable";
+    private static final String RENDER_ERRORS = "renderErrors";
+    private static final String LINT_WARNING = "lintWarning";
+    private static final String LINT_ERROR = "lintError";
+    private static final String SAMPLE_ORIGINAL_FILENAME = "sampleChart.tar.gz";
+    private static final String FILE_KEY = "file";
+    private static final String VALIDATION_ENDPOINT = "/validate";
+    private static final String VERSION_USED = "versionUsed";
+
+    private ValidationController validationController;
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @MockBean
+    private ValidationService validationService;
+
+    @Mock
+    private MultipartFile multipartFile;
+
+    @BeforeEach
+    void setUp() {
+        validationController = new ValidationController(validationService);
+    }
+
+    @Test
+    void shouldReturnValidResponseForMockedFile() {
+        TemplateValidationResult templateValidationResult = new TemplateValidationResult(true, new ArrayList<>());
+        LintValidationResult lintValidationResult = new LintValidationResult(true, new ArrayList<>(),
+            new ArrayList<>());
+
+        when(validationService.process(SAMPLE_VERSION, multipartFile, true, true))
+            .thenReturn(new ValidationResult(templateValidationResult, lintValidationResult, SAMPLE_VERSION));
+
+        ResponseEntity<ValidationResult> result = validationController
+            .validate(SAMPLE_VERSION, multipartFile, true, true);
+
+        assertThat(result.getStatusCode()).isEqualTo(HttpStatus.OK);
+        assertThat(result.getBody().isDeployable()).isTrue();
+        assertThat(result.getBody().isValid()).isTrue();
+        assertThat(result.getBody().getRenderErrors()).isEmpty();
+        assertThat(result.getBody().getLintError()).isEmpty();
+        assertThat(result.getBody().getLintWarning()).isEmpty();
+        assertThat(result.getBody().getVersionUsed()).isEqualTo(SAMPLE_VERSION);
+
+    }
+
+    @Test
+    void shouldThrowExceptionWhenCannotSaveFile() {
+        when(validationService.process(SAMPLE_VERSION, multipartFile, true, true)).thenThrow(SaveFileException.class);
+
+        assertThatExceptionOfType(SaveFileException.class)
+            .isThrownBy(() -> validationController.validate(SAMPLE_VERSION, multipartFile, true, true));
+    }
+
+    @Test
+    void shouldThrowExceptionIfErrorOccursDuringBashExecution() {
+        when(validationService.process(SAMPLE_VERSION, multipartFile, true, true))
+            .thenThrow(BashExecutionException.class);
+
+        assertThatExceptionOfType(BashExecutionException.class)
+            .isThrownBy(() -> validationController.validate(SAMPLE_VERSION, multipartFile, true, true));
+    }
+
+    @Test
+    void shouldThrowExceptionWhenProvidedVersionIsNotSupported() {
+        when(validationService.process(SAMPLE_VERSION, multipartFile, true, true)).thenThrow(
+            NotSupportedVersionException.class);
+
+        assertThatExceptionOfType(NotSupportedVersionException.class)
+            .isThrownBy(() -> validationController.validate(SAMPLE_VERSION, multipartFile, true, true));
+    }
+
+    @Test
+    void shouldContainDeployAndValidParametersInResponseBodyIfLintedIsTrue() throws Exception {
+
+        TemplateValidationResult templateValidationResult = new TemplateValidationResult(true, new ArrayList<>());
+        LintValidationResult lintValidationResult = new LintValidationResult(true, new ArrayList<>(),
+            new ArrayList<>());
+        MockMultipartFile file = new MockMultipartFile(FILE_KEY, SAMPLE_ORIGINAL_FILENAME,
+            MediaType.MULTIPART_FORM_DATA_VALUE, "test".getBytes());
+
+        when(validationService.process(SAMPLE_VERSION, file, true, true))
+            .thenReturn(new ValidationResult(templateValidationResult, lintValidationResult, SAMPLE_VERSION));
+
+        MvcResult mvcResult = mockMvc.perform(
+            multipart(VALIDATION_ENDPOINT)
+                .file(file)
+                .param(VERSION_PARAM, SAMPLE_VERSION)
+                .param(IS_LINTED_PARAM, "true")
+                .param(IS_STRICT_LINTED_PARAM, "true"))
+            .andReturn();
+        String contentAsString = mvcResult.getResponse().getContentAsString();
+
+        assertThat(contentAsString).contains(VALID);
+        assertThat(contentAsString).contains(DEPLOYABLE);
+        assertThat(contentAsString).contains(RENDER_ERRORS);
+        assertThat(contentAsString).contains(LINT_WARNING);
+        assertThat(contentAsString).contains(LINT_ERROR);
+        assertThat(contentAsString).contains(VERSION_USED);
+        assertThat(mvcResult.getResponse().getStatus()).isEqualTo(HttpStatus.OK.value());
+    }
+
+    @Test
+    void shouldNotContainValidParametersInResponseBodyIfLintedIsFalse() throws Exception {
+
+        TemplateValidationResult templateValidationResult = new TemplateValidationResult(true, new ArrayList<>());
+        MockMultipartFile file = new MockMultipartFile(FILE_KEY, SAMPLE_ORIGINAL_FILENAME,
+            MediaType.MULTIPART_FORM_DATA_VALUE, "test".getBytes());
+
+        when(validationService.process(SAMPLE_VERSION, file, false, false))
+            .thenReturn(new ValidationResult(templateValidationResult, SAMPLE_VERSION));
+
+        MvcResult mvcResult = mockMvc.perform(
+            multipart(VALIDATION_ENDPOINT)
+                .file(file)
+                .param(VERSION_PARAM, SAMPLE_VERSION)
+                .param(IS_LINTED_PARAM, "false")
+                .param(IS_STRICT_LINTED_PARAM, "false"))
+            .andReturn();
+        String contentAsString = mvcResult.getResponse().getContentAsString();
+
+        assertThat(contentAsString).doesNotContain(VALID);
+        assertThat(contentAsString).contains(DEPLOYABLE);
+        assertThat(contentAsString).contains(RENDER_ERRORS);
+        assertThat(contentAsString).doesNotContain(LINT_WARNING);
+        assertThat(contentAsString).doesNotContain(LINT_ERROR);
+        assertThat(contentAsString).contains(VERSION_USED);
+        assertThat(mvcResult.getResponse().getStatus()).isEqualTo(HttpStatus.OK.value());
+    }
+}
diff --git a/src/test/java/org/onap/sdc/helmvalidator/errorhandling/ValidationErrorHandlerTest.java b/src/test/java/org/onap/sdc/helmvalidator/errorhandling/ValidationErrorHandlerTest.java
new file mode 100644
index 0000000..5fbad30
--- /dev/null
+++ b/src/test/java/org/onap/sdc/helmvalidator/errorhandling/ValidationErrorHandlerTest.java
@@ -0,0 +1,125 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.errorhandling;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.onap.sdc.helmvalidator.helm.validation.exception.BashExecutionException;
+import org.onap.sdc.helmvalidator.helm.validation.exception.NotSupportedVersionException;
+import org.onap.sdc.helmvalidator.helm.validation.exception.SaveFileException;
+import org.onap.sdc.helmvalidator.helm.versions.exception.ApiVersionNotFoundException;
+import org.onap.sdc.helmvalidator.helm.versions.exception.NotSupportedApiVersionException;
+import org.onap.sdc.helmvalidator.helm.versions.exception.ReadFileException;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+
+@ExtendWith(MockitoExtension.class)
+class ValidationErrorHandlerTest {
+
+    private ValidationErrorHandler errorHandler;
+
+    @Mock
+    private Throwable cause;
+
+    @BeforeEach
+    void setUp() {
+        errorHandler = new ValidationErrorHandler();
+    }
+
+    @Test
+    void shouldReturnResponseEntityWithMessageWhenCannotSaveFile() {
+        String expectedMessage = "Cannot save file test-chart.tar.gz";
+        SaveFileException saveFileException = new SaveFileException(expectedMessage, cause);
+
+        ResponseEntity<ValidationErrorResponse> responseEntity = errorHandler.handle(saveFileException);
+
+        assertThat(responseEntity.getStatusCode()).isEqualTo(HttpStatus.INTERNAL_SERVER_ERROR);
+        assertThat(responseEntity.getBody().getMessage()).isEqualTo(expectedMessage);
+    }
+
+    @Test
+    void shouldReturnResponseEntityWithMessageWhenProvidedVersionIsNotSupported() {
+        String version = "3.3.3";
+        String expectedMessage = "Version: " + version + " is not supported";
+
+        NotSupportedVersionException notSupportedVersionException = new NotSupportedVersionException(version);
+
+        ResponseEntity<ValidationErrorResponse> responseEntity = errorHandler.handle(notSupportedVersionException);
+
+        assertThat(responseEntity.getStatusCode()).isEqualTo(HttpStatus.BAD_REQUEST);
+        assertThat(responseEntity.getBody().getMessage()).isEqualTo(expectedMessage);
+    }
+
+    @Test
+    void shouldReturnResponseEntityWithMessageWhenErrorOccursDuringBashExecution() {
+        String expectedMessage = "Error in bash executions";
+        BashExecutionException bashExecutionException = new BashExecutionException(expectedMessage, cause);
+
+        ResponseEntity<ValidationErrorResponse> responseEntity = errorHandler.handle(bashExecutionException);
+
+        assertThat(responseEntity.getStatusCode()).isEqualTo(HttpStatus.INTERNAL_SERVER_ERROR);
+        assertThat(responseEntity.getBody().getMessage()).isEqualTo(expectedMessage);
+
+    }
+
+    @Test
+    void shouldReturnResponseEntityWithMessageWhenHelmApiVersionNotFoundInChart() {
+        String expectedMessage = "Cannot find apiVersion value in a main chart";
+        ApiVersionNotFoundException apiVersionNotFoundException = new ApiVersionNotFoundException();
+
+        ResponseEntity<ValidationErrorResponse> responseEntity = errorHandler.handle(apiVersionNotFoundException);
+
+        assertThat(responseEntity.getStatusCode()).isEqualTo(HttpStatus.BAD_REQUEST);
+        assertThat(responseEntity.getBody().getMessage()).isEqualTo(expectedMessage);
+
+    }
+
+    @Test
+    void shouldReturnResponseEntityWithMessageWhenHelmApiVersionIsNotSupported() {
+        String expectedMessage = "Cannot obtain Helm version from API version";
+        NotSupportedApiVersionException notSupportedApiVersionException = new NotSupportedApiVersionException(
+            expectedMessage);
+
+        ResponseEntity<ValidationErrorResponse> responseEntity = errorHandler.handle(notSupportedApiVersionException);
+
+        assertThat(responseEntity.getStatusCode()).isEqualTo(HttpStatus.BAD_REQUEST);
+        assertThat(responseEntity.getBody().getMessage()).isEqualTo(expectedMessage);
+
+    }
+
+    @Test
+    void shouldReturnResponseEntityWithMessageWhenCannotReadChartFile() {
+        String expectedMessage = "Cannot read tar file from path";
+        ReadFileException readFileException = new ReadFileException(expectedMessage, cause);
+
+        ResponseEntity<ValidationErrorResponse> responseEntity = errorHandler.handle(readFileException);
+
+        assertThat(responseEntity.getStatusCode()).isEqualTo(HttpStatus.INTERNAL_SERVER_ERROR);
+        assertThat(responseEntity.getBody().getMessage()).isEqualTo(expectedMessage);
+
+    }
+
+}
diff --git a/src/test/java/org/onap/sdc/helmvalidator/helm/validation/BashExecutorTest.java b/src/test/java/org/onap/sdc/helmvalidator/helm/validation/BashExecutorTest.java
new file mode 100644
index 0000000..5f76b83
--- /dev/null
+++ b/src/test/java/org/onap/sdc/helmvalidator/helm/validation/BashExecutorTest.java
@@ -0,0 +1,43 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+import org.onap.sdc.helmvalidator.helm.validation.exception.BashExecutionException;
+import org.onap.sdc.helmvalidator.helm.validation.model.BashOutput;
+
+class BashExecutorTest {
+
+
+    @Test
+    @Disabled("Disabled due to Operating System dependency - allowed on Linux OS")
+    void testExecution() throws BashExecutionException {
+
+        BashExecutor executor = new BashExecutor();
+
+        BashOutput output = executor.execute("ls -al");
+
+        assertThat(output.getOutputLines()).isNotEmpty();
+    }
+}
diff --git a/src/test/java/org/onap/sdc/helmvalidator/helm/validation/FileManagerTest.java b/src/test/java/org/onap/sdc/helmvalidator/helm/validation/FileManagerTest.java
new file mode 100644
index 0000000..2d05cd9
--- /dev/null
+++ b/src/test/java/org/onap/sdc/helmvalidator/helm/validation/FileManagerTest.java
@@ -0,0 +1,100 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.when;
+
+import java.io.ByteArrayInputStream;
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Comparator;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.web.multipart.MultipartFile;
+
+@ExtendWith(MockitoExtension.class)
+class FileManagerTest {
+
+    private static final String TEST_RESOURCES_TMP = "src/test/resources/tmp";
+    private static final File TEST_RESOURCES_DIR = new File(TEST_RESOURCES_TMP);
+    private static final ByteArrayInputStream TEST_INPUT_STREAM = new ByteArrayInputStream("test".getBytes());
+    private static final String SAMPLE_FILE_NAME = "sample_file";
+
+    private FileManager fileManager;
+
+    @Mock
+    private MultipartFile multipartFile;
+
+    @BeforeAll
+    static void createTmpDir() {
+        TEST_RESOURCES_DIR.mkdirs();
+    }
+
+    @AfterAll
+    static void cleanTmpDir() throws IOException {
+        Files.walk(Paths.get(TEST_RESOURCES_TMP))
+            .sorted(Comparator.reverseOrder())
+            .map(Path::toFile)
+            .filter(File::isFile)
+            .forEach(File::delete);
+        TEST_RESOURCES_DIR.delete();
+    }
+
+    @BeforeEach
+    void setUp() {
+        fileManager = new FileManager(TEST_RESOURCES_TMP);
+    }
+
+    @Test
+    void saveMultipartFileAndReturnFilePath() throws IOException {
+        mockMultipartFile();
+
+        String filePath = fileManager.saveFile(multipartFile);
+
+        assertThat(filePath).isNotBlank();
+        assertThat(Files.exists(Paths.get(filePath))).isTrue();
+    }
+
+
+    @Test
+    void removeFileByPath() throws IOException {
+        mockMultipartFile();
+
+        String filePath = fileManager.saveFile(multipartFile);
+        fileManager.removeFile(filePath);
+
+        assertThat(Files.exists(Paths.get(filePath))).isFalse();
+    }
+
+    private void mockMultipartFile() throws IOException {
+        when(multipartFile.getOriginalFilename()).thenReturn(SAMPLE_FILE_NAME);
+        when(multipartFile.getInputStream()).thenReturn(TEST_INPUT_STREAM);
+    }
+}
diff --git a/src/test/java/org/onap/sdc/helmvalidator/helm/validation/ValidationServiceTest.java b/src/test/java/org/onap/sdc/helmvalidator/helm/validation/ValidationServiceTest.java
new file mode 100644
index 0000000..c3c4093
--- /dev/null
+++ b/src/test/java/org/onap/sdc/helmvalidator/helm/validation/ValidationServiceTest.java
@@ -0,0 +1,314 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.mockito.Mockito.lenient;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.onap.sdc.helmvalidator.helm.validation.exception.BashExecutionException;
+import org.onap.sdc.helmvalidator.helm.validation.exception.NotSupportedVersionException;
+import org.onap.sdc.helmvalidator.helm.validation.exception.SaveFileException;
+import org.onap.sdc.helmvalidator.helm.validation.model.BashOutput;
+import org.onap.sdc.helmvalidator.helm.validation.model.ValidationResult;
+import org.onap.sdc.helmvalidator.helm.versions.ChartBasedVersionProvider;
+import org.onap.sdc.helmvalidator.helm.versions.SupportedVersionsProvider;
+import org.springframework.web.multipart.MultipartFile;
+
+@ExtendWith(MockitoExtension.class)
+class ValidationServiceTest {
+
+    private static final String HELM_ERROR_ON_TEMPLATE =
+        "Error: parse error at (sample/templates/fail.yaml:1): function \"deliberateSyntaxError\" not defined";
+    private static final String HELM_ERROR_ON_LINT =
+        "[ERROR] templates/: parse error at (sample/templates/fail.yaml:1): function \"deliberateSyntaxError\" "
+            + "not defined\n";
+    private static final String HELM_WARNING_ON_LINT =
+        "[WARNING] templates/: directory not found\n";
+    private static final String HELM_WITHOUT_STANDARD_ERROR_ON_LINT =
+        "unable to check Chart.yaml file in chart: stat /charts/1610528407457_apiv2.tar.gz/Chart.yaml: not a directory";
+    private static final String HELM_LINT_ERROR_SUMMARY_MESSAGE = "Error: 0 chart(s) linted, 1 chart(s) failed";
+    private static final String HELM_EMPTY_OUTPUT = "";
+
+    private static final boolean LINTED = true;
+    private static final boolean NOT_LINTED = false;
+    private static final boolean STRICT_LINTED = true;
+    private static final boolean NOT_STRICT_LINTED = false;
+    private static final int SUCCESS_HELM_EXIT_CODE = 0;
+    private static final int UNSUCCESSFUL_HELM_EXIT_CODE = 1;
+
+    private static final String SAMPLE_VERSION = "3.3.3";
+    private static final List<String> SAMPLE_VERSIONS = List.of("3.3.4", "3.3.3", "2.3.1", "2.1.4", "2.3.4");
+    private static final String NOT_SUPPORTED_VERSION = "not supported version";
+
+    private static final String SAMPLE_PATH = "samplePath";
+    private static final String HELM_TEMPLATE = "helm-v3.3.3 template samplePath";
+    private static final String HELM_LINT = "helm-v3.3.3 lint samplePath";
+    private static final String HELM_LINT_STRICT = "helm-v3.3.3 lint samplePath --strict";
+    private static final int EXPECTED_ONE = 1;
+
+    private ValidationService validationService;
+
+    @Mock
+    private FileManager fileManager;
+
+    @Mock
+    private SupportedVersionsProvider versionsProvider;
+
+    @Mock
+    private ChartBasedVersionProvider chartBasedProvider;
+
+    @Mock
+    private MultipartFile multipartFile;
+
+    @Mock
+    private BashExecutor bashExecutor;
+
+    @BeforeEach
+    void setUp() {
+        when(fileManager.saveFile(multipartFile)).thenReturn(SAMPLE_PATH);
+        lenient().when(versionsProvider.getVersions()).thenReturn(SAMPLE_VERSIONS);
+        this.validationService = new ValidationService(fileManager, bashExecutor, versionsProvider, chartBasedProvider);
+    }
+
+    @Test
+    void shouldThrowExceptionWhenCannotSaveFile() {
+        when(fileManager.saveFile(multipartFile)).thenThrow(SaveFileException.class);
+
+        assertThatExceptionOfType(SaveFileException.class)
+            .isThrownBy(
+                () -> validationService.process(SAMPLE_VERSION, multipartFile, LINTED, STRICT_LINTED));
+    }
+
+    @Test
+    void shouldThrowExceptionWhenVersionsIsNotSupported() {
+
+        assertThatExceptionOfType(NotSupportedVersionException.class)
+            .isThrownBy(
+                () -> validationService.process(NOT_SUPPORTED_VERSION, multipartFile, LINTED, STRICT_LINTED));
+    }
+
+    @Test
+    void shouldBeValidAndDeployableForNoErrorsAndNoWarning() {
+        mockBashCommand(HELM_TEMPLATE, SUCCESS_HELM_EXIT_CODE, HELM_EMPTY_OUTPUT);
+        mockBashCommand(HELM_LINT_STRICT, SUCCESS_HELM_EXIT_CODE, HELM_EMPTY_OUTPUT);
+
+        ValidationResult validationResult = validationService
+            .process(SAMPLE_VERSION, multipartFile, LINTED, STRICT_LINTED);
+
+        assertThat(validationResult.isDeployable()).isTrue();
+        assertThat(validationResult.isValid()).isTrue();
+        assertThat(validationResult.getRenderErrors()).isEmpty();
+        assertThat(validationResult.getLintError()).isEmpty();
+        assertThat(validationResult.getLintWarning()).isEmpty();
+    }
+
+    @ParameterizedTest
+    @CsvSource({"v2", "v3"})
+    void shouldBeDeployableForLatestHelmVersion(String desiredVersion) {
+        final String majorVersion = desiredVersion.substring(1);
+        final String helmVersion = getLatestSampleHelmVersion(majorVersion);
+        final String helmTemplate = String.format("helm-v%s template samplePath", helmVersion);
+        when(versionsProvider.getLatestVersion(Mockito.anyString())).thenReturn(helmVersion);
+        mockBashCommand(helmTemplate, SUCCESS_HELM_EXIT_CODE, HELM_EMPTY_OUTPUT);
+
+        ValidationResult validationResult = validationService
+            .process(desiredVersion, multipartFile, NOT_LINTED, NOT_STRICT_LINTED);
+
+        assertThat(validationResult.isDeployable()).isTrue();
+        assertThat(validationResult.getRenderErrors()).isEmpty();
+        verify(versionsProvider).getLatestVersion(majorVersion);
+    }
+
+    @Test
+    void shouldBeValidAndDeployableForVersionTakenFromChart() {
+        when(chartBasedProvider.getVersion(Mockito.anyString())).thenReturn(SAMPLE_VERSION);
+        mockBashCommand(HELM_TEMPLATE, SUCCESS_HELM_EXIT_CODE, HELM_EMPTY_OUTPUT);
+        mockBashCommand(HELM_LINT_STRICT, SUCCESS_HELM_EXIT_CODE, HELM_EMPTY_OUTPUT);
+
+        ValidationResult validationResult = validationService
+            .process(null, multipartFile, LINTED, STRICT_LINTED);
+
+        assertThat(validationResult.isDeployable()).isTrue();
+        assertThat(validationResult.isValid()).isTrue();
+        assertThat(validationResult.getRenderErrors()).isEmpty();
+        assertThat(validationResult.getLintError()).isEmpty();
+        assertThat(validationResult.getLintWarning()).isEmpty();
+        verify(chartBasedProvider).getVersion(SAMPLE_PATH);
+    }
+
+    @Test
+    void shouldBeUndeployableForRenderErrorsWithMessages() {
+        mockBashCommand(HELM_TEMPLATE, UNSUCCESSFUL_HELM_EXIT_CODE, HELM_ERROR_ON_TEMPLATE);
+
+        ValidationResult validationResult = validationService
+            .process(SAMPLE_VERSION, multipartFile, NOT_LINTED, NOT_STRICT_LINTED);
+
+        assertThat(validationResult.isDeployable()).isFalse();
+        assertThat(validationResult.getRenderErrors()).isNotEmpty();
+    }
+
+    @Test
+    void shouldBeUndeployableAndValidWhenRenderFailAndLintSuccessfulWithMessages()
+        throws BashExecutionException, SaveFileException {
+        mockBashCommand(HELM_TEMPLATE, UNSUCCESSFUL_HELM_EXIT_CODE, HELM_ERROR_ON_TEMPLATE);
+        mockBashCommand(HELM_LINT_STRICT, SUCCESS_HELM_EXIT_CODE, HELM_EMPTY_OUTPUT);
+
+        ValidationResult validationResult = validationService
+            .process(SAMPLE_VERSION, multipartFile, LINTED, STRICT_LINTED);
+
+        assertThat(validationResult.isDeployable()).isFalse();
+        assertThat(validationResult.isValid()).isTrue();
+        assertThat(validationResult.getRenderErrors()).isNotEmpty();
+        assertThat(validationResult.getLintError()).isEmpty();
+        assertThat(validationResult.getLintWarning()).isEmpty();
+    }
+
+    @Test
+    void shouldBeDeployableAndInvalidForErrorOnLintWithMessages() {
+        mockBashCommand(HELM_TEMPLATE, SUCCESS_HELM_EXIT_CODE, HELM_EMPTY_OUTPUT);
+        mockBashCommand(HELM_LINT, UNSUCCESSFUL_HELM_EXIT_CODE, HELM_ERROR_ON_LINT);
+
+        ValidationResult validationResult = validationService
+            .process(SAMPLE_VERSION, multipartFile, LINTED, NOT_STRICT_LINTED);
+
+        assertThat(validationResult.isDeployable()).isTrue();
+        assertThat(validationResult.isValid()).isFalse();
+        assertThat(validationResult.getRenderErrors()).isEmpty();
+        assertThat(validationResult.getLintError()).isNotEmpty();
+        assertThat(validationResult.getLintWarning()).isEmpty();
+    }
+
+    @Test
+    void shouldBeDeployableAndInvalidForWarningOnLintAndStrictLintWithMessages()
+        throws BashExecutionException, SaveFileException {
+        mockBashCommand(HELM_TEMPLATE, SUCCESS_HELM_EXIT_CODE, HELM_EMPTY_OUTPUT);
+        mockBashCommand(HELM_LINT_STRICT, UNSUCCESSFUL_HELM_EXIT_CODE, HELM_WARNING_ON_LINT);
+
+        ValidationResult validationResult = validationService
+            .process(SAMPLE_VERSION, multipartFile, LINTED, STRICT_LINTED);
+
+        assertThat(validationResult.isDeployable()).isTrue();
+        assertThat(validationResult.isValid()).isFalse();
+        assertThat(validationResult.getRenderErrors()).isEmpty();
+        assertThat(validationResult.getLintError()).isEmpty();
+        assertThat(validationResult.getLintWarning()).isNotEmpty();
+    }
+
+    @Test
+    void shouldBeUndeployableAndInvalidForErrorOnTemplateAndErrorOnLintWithMessages()
+        throws BashExecutionException, SaveFileException {
+        mockBashCommand(HELM_TEMPLATE, UNSUCCESSFUL_HELM_EXIT_CODE, HELM_ERROR_ON_TEMPLATE);
+        mockBashCommand(HELM_LINT_STRICT, UNSUCCESSFUL_HELM_EXIT_CODE, HELM_WARNING_ON_LINT, HELM_ERROR_ON_LINT);
+
+        ValidationResult validationResult = validationService
+            .process(SAMPLE_VERSION, multipartFile, LINTED, STRICT_LINTED);
+
+        assertThat(validationResult.isDeployable()).isFalse();
+        assertThat(validationResult.isValid()).isFalse();
+        assertThat(validationResult.getRenderErrors()).isNotEmpty();
+        assertThat(validationResult.getLintError()).isNotEmpty();
+        assertThat(validationResult.getLintWarning()).isNotEmpty();
+    }
+
+    @Test
+    void shouldBeInvalidForWarningOnStrictLintWithMessages() throws BashExecutionException, SaveFileException {
+        mockBashCommand(HELM_TEMPLATE, SUCCESS_HELM_EXIT_CODE, HELM_EMPTY_OUTPUT);
+        mockBashCommand(HELM_LINT_STRICT, UNSUCCESSFUL_HELM_EXIT_CODE, HELM_WARNING_ON_LINT);
+
+        ValidationResult validationResult = validationService
+            .process(SAMPLE_VERSION, multipartFile, LINTED, STRICT_LINTED);
+
+        assertThat(validationResult.isValid()).isFalse();
+        assertThat(validationResult.getLintError()).isEmpty();
+        assertThat(validationResult.getLintWarning()).isNotEmpty();
+    }
+
+    @Test
+    void shouldAddUsedVersionToValidationResultOnLinted() {
+        mockBashCommand(HELM_TEMPLATE, SUCCESS_HELM_EXIT_CODE, HELM_EMPTY_OUTPUT);
+        mockBashCommand(HELM_LINT_STRICT, SUCCESS_HELM_EXIT_CODE, HELM_EMPTY_OUTPUT);
+
+        ValidationResult validationResult = validationService
+            .process(SAMPLE_VERSION, multipartFile, LINTED, STRICT_LINTED);
+        assertThat(validationResult.getVersionUsed()).isEqualTo(SAMPLE_VERSION);
+    }
+
+    @Test
+    void shouldAddUsedVersionToValidationResultOnNotLinted() {
+        mockBashCommand(HELM_TEMPLATE, SUCCESS_HELM_EXIT_CODE, HELM_EMPTY_OUTPUT);
+
+        ValidationResult validationResult = validationService
+            .process(SAMPLE_VERSION, multipartFile, NOT_LINTED, NOT_STRICT_LINTED);
+        assertThat(validationResult.getVersionUsed()).isEqualTo(SAMPLE_VERSION);
+    }
+
+    @Test
+    void shouldAddBashOutputToResultWhenHelmReturnNonStandardError() {
+        mockBashCommand(HELM_TEMPLATE, SUCCESS_HELM_EXIT_CODE, HELM_EMPTY_OUTPUT);
+        mockBashCommand(HELM_LINT_STRICT, UNSUCCESSFUL_HELM_EXIT_CODE, HELM_WITHOUT_STANDARD_ERROR_ON_LINT);
+
+        ValidationResult validationResult = validationService
+            .process(SAMPLE_VERSION, multipartFile, LINTED, STRICT_LINTED);
+        assertThat(validationResult.getLintError()).isNotEmpty();
+    }
+
+    @Test
+    void shouldNotAddSummaryMessageToLintErrors() {
+        mockBashCommand(HELM_TEMPLATE, SUCCESS_HELM_EXIT_CODE, HELM_EMPTY_OUTPUT);
+        mockBashCommand(HELM_LINT_STRICT, UNSUCCESSFUL_HELM_EXIT_CODE, HELM_ERROR_ON_LINT,
+            HELM_LINT_ERROR_SUMMARY_MESSAGE);
+
+        ValidationResult validationResult = validationService
+            .process(SAMPLE_VERSION, multipartFile, LINTED, STRICT_LINTED);
+        assertThat(validationResult.getLintError()).isNotEmpty();
+        assertThat(validationResult.getLintError()).hasSize(EXPECTED_ONE);
+    }
+
+    private String getLatestSampleHelmVersion(String majorVersion) {
+        return SAMPLE_VERSIONS.stream()
+            .filter(version -> version.startsWith(majorVersion))
+            .findFirst()
+            .orElseThrow(() -> new IllegalArgumentException("Not supported version"));
+    }
+
+    private void mockBashCommand(String command, int exitValue, String... consoleOutput) {
+        when(bashExecutor.execute(command))
+            .thenReturn(new BashOutput(exitValue, mockBashConsoleLog(consoleOutput)));
+    }
+
+    private List<String> mockBashConsoleLog(String... args) {
+        return Arrays.stream(args).collect(Collectors.toList());
+    }
+}
diff --git a/src/test/java/org/onap/sdc/helmvalidator/helm/versions/ApiVersionsReaderTest.java b/src/test/java/org/onap/sdc/helmvalidator/helm/versions/ApiVersionsReaderTest.java
new file mode 100644
index 0000000..7343e59
--- /dev/null
+++ b/src/test/java/org/onap/sdc/helmvalidator/helm/versions/ApiVersionsReaderTest.java
@@ -0,0 +1,128 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.versions;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.List;
+import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
+import org.apache.commons.compress.archivers.tar.TarArchiveOutputStream;
+import org.apache.commons.compress.compressors.gzip.GzipCompressorOutputStream;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+import org.onap.sdc.helmvalidator.helm.versions.exception.ApiVersionNotFoundException;
+import org.onap.sdc.helmvalidator.helm.versions.exception.ReadFileException;
+
+class ApiVersionsReaderTest {
+
+    private static final String TEST_RESOURCES_TMP = "src/test/resources/tmp";
+    private static final Path TEST_CHART_PATH = Path.of(TEST_RESOURCES_TMP).resolve(Path.of("Chart.yaml"));
+
+    private static final Path TEST_TAR_PATH = Path.of(TEST_RESOURCES_TMP, "test.tar");
+
+    private ApiVersionsReader apiVersionsReader;
+
+    @BeforeEach
+    void setUp() {
+        apiVersionsReader = new ApiVersionsReader();
+    }
+
+    @ParameterizedTest
+    @ValueSource(strings = {"v1", "v2"})
+    void shouldCorrectlyReadApiVersionFromTar(String apiVersion) throws IOException {
+        prepareTestTar(apiVersion);
+
+        String helmVersion = apiVersionsReader.readVersion(TEST_TAR_PATH.toString());
+
+        assertThat(helmVersion).isEqualTo(apiVersion);
+    }
+
+    @Test
+    void shouldThrowExceptionWhenApiVersionIsNotProvided() throws IOException {
+        prepareTestTar(null);
+
+        Exception exception = assertThrows(ApiVersionNotFoundException.class,
+            () -> apiVersionsReader.readVersion(TEST_TAR_PATH.toString()));
+
+        assertThat(exception).hasMessageContaining("Cannot find apiVersion value in a main chart");
+    }
+
+    @Test
+    void shouldThrowExceptionForNotExistingPath() {
+        String notExistingChartPath = "not/exiting/chart/path";
+
+        Exception exception = assertThrows(ReadFileException.class,
+            () -> apiVersionsReader.readVersion(notExistingChartPath));
+
+        assertThat(exception).hasMessageContaining("Cannot read tar from path: " + notExistingChartPath);
+    }
+
+    @AfterEach
+    void cleanTmpDir() throws IOException {
+        Files.walk(Paths.get(TEST_RESOURCES_TMP))
+            .map(Path::toFile)
+            .filter(File::isFile)
+            .forEach(File::delete);
+    }
+
+    private void prepareTestTar(String apiVersion) throws IOException {
+        createTestChart(apiVersion);
+        createTestTar();
+    }
+
+    private void createTestTar() throws IOException {
+        TarArchiveOutputStream tarOutput = null;
+        try {
+            tarOutput = new TarArchiveOutputStream(
+                new GzipCompressorOutputStream(new FileOutputStream(String.valueOf(TEST_TAR_PATH))));
+
+            final String tarChartPath = "test/Chart.yaml";
+            TarArchiveEntry tarArchiveEntry = new TarArchiveEntry(TEST_CHART_PATH.toFile(), tarChartPath);
+            tarOutput.putArchiveEntry(tarArchiveEntry);
+
+            Files.copy(TEST_CHART_PATH, tarOutput);
+        } finally {
+            if (tarOutput != null) {
+                tarOutput.closeArchiveEntry();
+                tarOutput.close();
+            }
+        }
+    }
+
+    private void createTestChart(String apiVersion) throws IOException {
+        String apiVersionLine = apiVersion != null ? "apiVersion: " + apiVersion : "";
+
+        Files.createDirectories(TEST_CHART_PATH.getParent());
+        Files.createFile(TEST_CHART_PATH);
+        Files.write(TEST_CHART_PATH, List.of("appVersion: 1.0", apiVersionLine, "name: test-chart"));
+    }
+
+}
diff --git a/src/test/java/org/onap/sdc/helmvalidator/helm/versions/ChartBasedVersionProviderTest.java b/src/test/java/org/onap/sdc/helmvalidator/helm/versions/ChartBasedVersionProviderTest.java
new file mode 100644
index 0000000..64daf2d
--- /dev/null
+++ b/src/test/java/org/onap/sdc/helmvalidator/helm/versions/ChartBasedVersionProviderTest.java
@@ -0,0 +1,73 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.versions;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.mockito.Mockito.when;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.onap.sdc.helmvalidator.helm.versions.exception.NotSupportedApiVersionException;
+
+@ExtendWith(MockitoExtension.class)
+class ChartBasedVersionProviderTest {
+
+    private final String testChartPath = "test/path";
+    @Mock
+    private SupportedVersionsProvider versionsProvider;
+    @Mock
+    private ApiVersionsReader apiVersionsReader;
+    private ChartBasedVersionProvider chartBasedVersionProvider;
+
+    @BeforeEach
+    void setUp() {
+        chartBasedVersionProvider = new ChartBasedVersionProvider(versionsProvider, apiVersionsReader);
+    }
+
+    @ParameterizedTest
+    @CsvSource({"v1,2.18", "v2,3.11"})
+    void shouldGetLatestHelmVersionBasedOnApiVersion(String apiVersion, String expectedHelmVersion) {
+        when(apiVersionsReader.readVersion(testChartPath)).thenReturn(apiVersion);
+        when(versionsProvider.getLatestVersion(Mockito.anyString())).thenReturn(expectedHelmVersion);
+
+        String helmVersion = chartBasedVersionProvider.getVersion(testChartPath);
+
+        assertThat(helmVersion).isEqualTo(expectedHelmVersion);
+    }
+
+    @Test
+    void shouldThrowExceptionWhenApiVersionIsNotSupported() {
+        when(apiVersionsReader.readVersion(testChartPath)).thenReturn("v3");
+
+        Exception exception = assertThrows(NotSupportedApiVersionException.class,
+            () -> chartBasedVersionProvider.getVersion(testChartPath));
+
+        assertThat(exception).hasMessageContaining("Cannot obtain Helm version from API version: v3");
+    }
+
+}
diff --git a/src/test/java/org/onap/sdc/helmvalidator/helm/versions/SupportedVersionsProviderTest.java b/src/test/java/org/onap/sdc/helmvalidator/helm/versions/SupportedVersionsProviderTest.java
new file mode 100644
index 0000000..c28d339
--- /dev/null
+++ b/src/test/java/org/onap/sdc/helmvalidator/helm/versions/SupportedVersionsProviderTest.java
@@ -0,0 +1,72 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.versions;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.when;
+
+import java.util.List;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+@ExtendWith(MockitoExtension.class)
+class SupportedVersionsProviderTest {
+
+    private static final List<String> UNSORTED_VERSIONS = List.of("1.0.0", "2.2.1", "2.0.0", "3.0.0");
+    private static final List<String> SORTED_VERSIONS = List.of("3.0.0", "2.2.1", "2.0.0", "1.0.0");
+    private static final List<String> SUPPORTED_VERSIONS = List.of("4.2.0", "3.11.3", "3.1.0", "3.0.4", "2.18.2",
+        "2.1.5", "1.5.6");
+
+    private SupportedVersionsProvider versionsProvider;
+
+    @Mock
+    private SystemEnvVersionsReader versionsReader;
+
+    @BeforeEach
+    void setUp() {
+        versionsProvider = new SupportedVersionsProvider(versionsReader);
+    }
+
+    @Test
+    void shouldReturnSortedVersionsInRevertOrder() {
+
+        when(versionsReader.readVersions()).thenReturn(UNSORTED_VERSIONS);
+
+        List<String> versions = versionsProvider.getVersions();
+
+        assertThat(versions).isEqualTo(SORTED_VERSIONS);
+    }
+
+    @ParameterizedTest
+    @CsvSource({"2,2.18.2", "3,3.11.3"})
+    void shouldGetLatestHelmVersionBasedOnDesiredMajorVersion(String desiredMajorVersion, String expectedHelmVersion) {
+        when(versionsProvider.getVersions()).thenReturn(SUPPORTED_VERSIONS);
+
+        String helmVersion = versionsProvider.getLatestVersion(desiredMajorVersion);
+
+        assertThat(helmVersion).isEqualTo(expectedHelmVersion);
+    }
+}
diff --git a/src/test/java/org/onap/sdc/helmvalidator/helm/versions/SystemEnvVersionsReaderTest.java b/src/test/java/org/onap/sdc/helmvalidator/helm/versions/SystemEnvVersionsReaderTest.java
new file mode 100644
index 0000000..7748355
--- /dev/null
+++ b/src/test/java/org/onap/sdc/helmvalidator/helm/versions/SystemEnvVersionsReaderTest.java
@@ -0,0 +1,69 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.versions;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.when;
+
+import java.util.List;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+@ExtendWith(MockitoExtension.class)
+class SystemEnvVersionsReaderTest {
+
+    private static final String SINGLE_VERSION_VALUE = "3.2.1";
+    private static final String MULTIPLE_VERSIONS_VALUE = "3.2.1,2.0.0,1.0.0";
+    private static final int EXPECTED_SIZE_ONE = 1;
+    private static final int EXPECTED_SIZE_THREE = 3;
+
+    @Spy
+    private SystemEnvVersionsReader versionsReader;
+
+    @Test
+    void canReadSingleValue() {
+        when(versionsReader.getSupportedVersionsFromEnv()).thenReturn(SINGLE_VERSION_VALUE);
+
+        List<String> versions = versionsReader.readVersions();
+
+        assertThat(versions).hasSize(EXPECTED_SIZE_ONE);
+    }
+
+    @Test
+    void canReadMultipleValues() {
+        when(versionsReader.getSupportedVersionsFromEnv()).thenReturn(MULTIPLE_VERSIONS_VALUE);
+
+        List<String> versions = versionsReader.readVersions();
+
+        assertThat(versions).hasSize(EXPECTED_SIZE_THREE);
+    }
+
+    @Test
+    void returnEmptyListWhenVariableIsNotPresent() {
+        when(versionsReader.getSupportedVersionsFromEnv()).thenReturn("");
+
+        List<String> versions = versionsReader.readVersions();
+
+        assertThat(versions).isEmpty();
+    }
+}
diff --git a/version.properties b/version.properties
new file mode 100644
index 0000000..e8f8e5a
--- /dev/null
+++ b/version.properties
@@ -0,0 +1,6 @@
+major=0
+minor=0
+patch=1
+base_version=${major}.${minor}.${patch}
+release_version=${base_version}
+snapshot_version=${base_version}-SNAPSHOT