Add loading configuration from env to truststore merger

Issue-ID: DCAEGEN2-2253
Signed-off-by: Remigiusz Janeczek <remigiusz.janeczek@nokia.com>
Change-Id: I06b3e3fcebbca96a4b9cbb4c693ae16eb29366eb

13 files changed, 557 insertions, 4 deletions

diff --git a/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/TrustStoreMerger.java b/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/TrustStoreMerger.java
index f280800b..ee57b3aa 100644
--- a/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/TrustStoreMerger.java
+++ b/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/TrustStoreMerger.java
@@ -20,6 +20,13 @@
 package org.onap.oom.truststoremerger;
 
 import org.onap.oom.truststoremerger.api.ExitStatus;
+import org.onap.oom.truststoremerger.api.ExitableException;
+import org.onap.oom.truststoremerger.certification.file.EnvProvider;
+import org.onap.oom.truststoremerger.certification.file.TruststoresPathsProvider;
+import org.onap.oom.truststoremerger.configuration.MergerConfiguration;
+import org.onap.oom.truststoremerger.configuration.MergerConfigurationException;
+import org.onap.oom.truststoremerger.configuration.MergerConfigurationFactory;
+import org.onap.oom.truststoremerger.certification.file.PathValidator;
 
 class TrustStoreMerger {
 
@@ -30,6 +37,21 @@ class TrustStoreMerger {
     }
 
     void run() {
-        appExitHandler.exit(ExitStatus.SUCCESS);
+        try {
+            mergeTruststores();
+            appExitHandler.exit(ExitStatus.SUCCESS);
+        } catch (ExitableException e) {
+            appExitHandler.exit(e.applicationExitStatus());
+        }
+    }
+
+    private void mergeTruststores() throws ExitableException {
+        MergerConfiguration configuration = loadConfiguration();
+    }
+
+    private MergerConfiguration loadConfiguration() throws ExitableException {
+        TruststoresPathsProvider truststoresPathsProvider = new TruststoresPathsProvider(new EnvProvider(), new PathValidator());
+        MergerConfigurationFactory factory = new MergerConfigurationFactory(truststoresPathsProvider);
+        return factory.createConfiguration();
     }
 }
diff --git a/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/api/ExitStatus.java b/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/api/ExitStatus.java
index 84184e89..ae145f7e 100644
--- a/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/api/ExitStatus.java
+++ b/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/api/ExitStatus.java
@@ -21,7 +21,9 @@ package org.onap.oom.truststoremerger.api;
 
 public enum ExitStatus {
 
-    SUCCESS(0, "Success");
+    SUCCESS(0, "Success"),
+    TRUSTSTORES_PATHS_PROVIDER_EXCEPTION(1, "Invalid paths in environment variables"),
+    MERGER_CONFIGURATION_EXCEPTION(2, "Invalid merger configuration");
 
     private final int value;
     private final String message;
diff --git a/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/certification/file/EnvProvider.java b/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/certification/file/EnvProvider.java
new file mode 100644
index 00000000..f64edc89
--- /dev/null
+++ b/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/certification/file/EnvProvider.java
@@ -0,0 +1,29 @@
+/*============LICENSE_START=======================================================
+ * oom-truststore-merger
+ * ================================================================================
+ * Copyright (C) 2020 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.oom.truststoremerger.certification.file;
+
+import java.util.Optional;
+
+public class EnvProvider {
+
+    Optional<String> getEnv(String name) {
+        return Optional.ofNullable(System.getenv(name));
+    }
+}
diff --git a/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/certification/file/PathValidator.java b/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/certification/file/PathValidator.java
new file mode 100644
index 00000000..05b80f14
--- /dev/null
+++ b/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/certification/file/PathValidator.java
@@ -0,0 +1,38 @@
+/*============LICENSE_START=======================================================
+ * oom-truststore-merger
+ * ================================================================================
+ * Copyright (C) 2020 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.oom.truststoremerger.certification.file;
+
+public class PathValidator {
+
+    private static final String TRUSTSTORE_PATH_REGEX = "^(/[a-zA-Z0-9_-]+)+\\.(pem|jks|p12)";
+    private static final String TRUSTSTORE_PASSWORD_PATH_REGEX = "^(/[a-zA-Z0-9_-]+)+\\.pass";
+
+    public boolean isTruststorePathValid(String truststorePath) {
+        return isPathValid(truststorePath, TRUSTSTORE_PATH_REGEX);
+    }
+
+    public boolean isTruststorePasswordPathValid(String truststorePasswordPath) {
+        return truststorePasswordPath.isEmpty() || isPathValid(truststorePasswordPath, TRUSTSTORE_PASSWORD_PATH_REGEX);
+    }
+
+    private boolean isPathValid(String path, String regex) {
+        return path.matches(regex);
+    }
+}
diff --git a/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/certification/file/TruststoresPathsProvider.java b/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/certification/file/TruststoresPathsProvider.java
new file mode 100644
index 00000000..b7b73e6b
--- /dev/null
+++ b/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/certification/file/TruststoresPathsProvider.java
@@ -0,0 +1,69 @@
+/*============LICENSE_START=======================================================
+ * oom-truststore-merger
+ * ================================================================================
+ * Copyright (C) 2020 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.oom.truststoremerger.certification.file;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.function.Predicate;
+
+public class TruststoresPathsProvider {
+
+    static final String TRUSTSTORES_ENV = "TRUSTSTORES";
+    static final String TRUSTSTORES_PASSWORDS_ENV = "TRUSTSTORES_PASSWORDS";
+    private static final String DELIMITER = ":";
+    private static final int NEGATIVE_SPLIT_LIMIT = -1;
+
+    private EnvProvider envProvider;
+    private PathValidator pathValidator;
+
+    public TruststoresPathsProvider(EnvProvider envProvider, PathValidator pathValidator) {
+        this.envProvider = envProvider;
+        this.pathValidator = pathValidator;
+    }
+
+    public List<String> getTruststores() throws TruststoresPathsProviderException {
+        return envProvider.getEnv(TRUSTSTORES_ENV)
+                .filter(Predicate.not(String::isEmpty))
+                .map(this::splitToList)
+                .filter(this::validateTruststores)
+                .orElseThrow(() -> new TruststoresPathsProviderException("TRUSTSTORES environment variable does not contain valid truststores paths"));
+    }
+
+    public List<String> getTruststoresPasswords() throws TruststoresPathsProviderException {
+        return envProvider.getEnv(TRUSTSTORES_PASSWORDS_ENV)
+                .map(this::splitToList)
+                .filter(this::validateTruststoresPasswords)
+                .orElseThrow(() -> new TruststoresPathsProviderException("TRUSTSTORES_PASSWORDS environment variable does not contain valid passwords paths"));
+    }
+
+    private boolean validateTruststores(List<String> truststores) {
+        return truststores.stream()
+                .allMatch(pathValidator::isTruststorePathValid);
+    }
+
+    private boolean validateTruststoresPasswords(List<String> truststoresPasswords) {
+        return truststoresPasswords.stream()
+                .allMatch(pathValidator::isTruststorePasswordPathValid);
+    }
+
+    private List<String> splitToList(String stringToSplit) {
+        return Arrays.asList(stringToSplit.split(DELIMITER, NEGATIVE_SPLIT_LIMIT));
+    }
+}
diff --git a/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/certification/file/TruststoresPathsProviderException.java b/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/certification/file/TruststoresPathsProviderException.java
new file mode 100644
index 00000000..5f491c36
--- /dev/null
+++ b/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/certification/file/TruststoresPathsProviderException.java
@@ -0,0 +1,30 @@
+/*============LICENSE_START=======================================================
+ * oom-truststore-merger
+ * ================================================================================
+ * Copyright (C) 2020 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.oom.truststoremerger.certification.file;
+
+import org.onap.oom.truststoremerger.api.ExitStatus;
+import org.onap.oom.truststoremerger.api.ExitableException;
+
+public class TruststoresPathsProviderException extends ExitableException {
+
+    TruststoresPathsProviderException(String message) {
+        super(message, ExitStatus.TRUSTSTORES_PATHS_PROVIDER_EXCEPTION);
+    }
+}
diff --git a/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/configuration/MergerConfiguration.java b/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/configuration/MergerConfiguration.java
new file mode 100644
index 00000000..f3b7d935
--- /dev/null
+++ b/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/configuration/MergerConfiguration.java
@@ -0,0 +1,44 @@
+/*============LICENSE_START=======================================================
+ * oom-truststore-merger
+ * ================================================================================
+ * Copyright (C) 2020 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.oom.truststoremerger.configuration;
+
+import java.util.Collections;
+import java.util.List;
+
+public class MergerConfiguration {
+    private final List<String> truststoreFilePaths;
+    private final List<String> truststoreFilePasswordPaths;
+
+    public MergerConfiguration(List<String> truststoreFilePaths,
+                               List<String> truststoreFilePasswordPaths) {
+        this.truststoreFilePaths = List.copyOf(truststoreFilePaths);
+        this.truststoreFilePasswordPaths = List.copyOf(truststoreFilePasswordPaths);
+    }
+
+    public List<String> getTruststoreFilePaths() {
+        return Collections.unmodifiableList(truststoreFilePaths);
+    }
+
+
+    public List<String> getTruststoreFilePasswordPaths() {
+        return Collections.unmodifiableList(truststoreFilePasswordPaths);
+    }
+
+}
diff --git a/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/configuration/MergerConfigurationException.java b/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/configuration/MergerConfigurationException.java
new file mode 100644
index 00000000..54982f5f
--- /dev/null
+++ b/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/configuration/MergerConfigurationException.java
@@ -0,0 +1,30 @@
+/*============LICENSE_START=======================================================
+ * oom-truststore-merger
+ * ================================================================================
+ * Copyright (C) 2020 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.oom.truststoremerger.configuration;
+
+import org.onap.oom.truststoremerger.api.ExitStatus;
+import org.onap.oom.truststoremerger.api.ExitableException;
+
+public class MergerConfigurationException extends ExitableException {
+
+    MergerConfigurationException(String message) {
+        super(message, ExitStatus.MERGER_CONFIGURATION_EXCEPTION);
+    }
+}
diff --git a/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/configuration/MergerConfigurationFactory.java b/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/configuration/MergerConfigurationFactory.java
new file mode 100644
index 00000000..eea0551d
--- /dev/null
+++ b/trustStoreMerger/src/main/java/org/onap/oom/truststoremerger/configuration/MergerConfigurationFactory.java
@@ -0,0 +1,45 @@
+/*============LICENSE_START=======================================================
+ * oom-truststore-merger
+ * ================================================================================
+ * Copyright (C) 2020 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.oom.truststoremerger.configuration;
+
+import org.onap.oom.truststoremerger.certification.file.TruststoresPathsProvider;
+import org.onap.oom.truststoremerger.certification.file.TruststoresPathsProviderException;
+
+import java.util.List;
+
+public class MergerConfigurationFactory {
+
+    private final TruststoresPathsProvider pathsProvider;
+
+    public MergerConfigurationFactory(TruststoresPathsProvider pathsProvider) {
+        this.pathsProvider = pathsProvider;
+    }
+
+    public MergerConfiguration createConfiguration() throws MergerConfigurationException, TruststoresPathsProviderException {
+        List<String> truststores = pathsProvider.getTruststores();
+        List<String> truststoresPasswords = pathsProvider.getTruststoresPasswords();
+
+        if (truststores.size() != truststoresPasswords.size()) {
+            throw new MergerConfigurationException("Size of TRUSTSTORES does not match size of TRUSTSTORES_PASSWORDS environment variables");
+        }
+
+        return new MergerConfiguration(truststores, truststoresPasswords);
+    }
+}
diff --git a/trustStoreMerger/src/test/java/org/onap/oom/truststoremerger/TrustStoreMergerTest.java b/trustStoreMerger/src/test/java/org/onap/oom/truststoremerger/TrustStoreMergerTest.java
index 11b18bf1..4787897a 100644
--- a/trustStoreMerger/src/test/java/org/onap/oom/truststoremerger/TrustStoreMergerTest.java
+++ b/trustStoreMerger/src/test/java/org/onap/oom/truststoremerger/TrustStoreMergerTest.java
@@ -34,9 +34,9 @@ class TrustStoreMergerTest {
     AppExitHandler appExitHandler;
 
     @Test
-    void shouldExitWithSuccess() {
+    void shouldExitWithMergeConfigurationExceptionDueToMissingEnvs() {
         new TrustStoreMerger(appExitHandler).run();
 
-        verify(appExitHandler).exit(ExitStatus.SUCCESS);
+        verify(appExitHandler).exit(ExitStatus.MERGER_CONFIGURATION_EXCEPTION);
     }
 }
diff --git a/trustStoreMerger/src/test/java/org/onap/oom/truststoremerger/certification/file/PathValidatorTest.java b/trustStoreMerger/src/test/java/org/onap/oom/truststoremerger/certification/file/PathValidatorTest.java
new file mode 100644
index 00000000..1c455764
--- /dev/null
+++ b/trustStoreMerger/src/test/java/org/onap/oom/truststoremerger/certification/file/PathValidatorTest.java
@@ -0,0 +1,58 @@
+/*============LICENSE_START=======================================================
+ * oom-truststore-merger
+ * ================================================================================
+ * Copyright (C) 2020 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.oom.truststoremerger.certification.file;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class PathValidatorTest {
+
+    private final PathValidator validator = new PathValidator();
+
+    @ParameterizedTest()
+    @ValueSource(strings = {"/opt/app/truststore.pem", "/opt/app/truststore.jks",
+            "/opt/app/truststore.p12", "/truststore.pem"})
+    void shouldAcceptValidTruststorePaths(String path) {
+        assertThat(validator.isTruststorePathValid(path)).isTrue();
+    }
+
+    @ParameterizedTest()
+    @ValueSource(strings = {"/opt/app/truststore.pass", "/opt/app/truststore.invalid", "/",
+            "truststore", "opt/app/truststore.p12", "/?.pem", "/.pem"})
+    void shouldRejectInValidTruststorePaths(String path) {
+        assertThat(validator.isTruststorePathValid(path)).isFalse();
+    }
+
+    @ParameterizedTest()
+    @ValueSource(strings = {"", "/opt/app/truststore.pass", "/truststore.pass"})
+    void shouldAcceptValidTruststorePasswordPaths(String path) {
+        assertThat(validator.isTruststorePasswordPathValid(path)).isTrue();
+    }
+
+    @ParameterizedTest()
+    @ValueSource(strings = {"/opt/app/truststore.pem", "/opt/app/truststore.jks",
+            "/opt/app/truststore.p12", "/", "truststore", "opt/app/truststore.p12", "/?.pass", "/.pass"})
+    void shouldRejectInValidTruststorePasswordPaths(String path) {
+        assertThat(validator.isTruststorePasswordPathValid(path)).isFalse();
+    }
+
+}
diff --git a/trustStoreMerger/src/test/java/org/onap/oom/truststoremerger/certification/file/TruststoresPathsProviderTest.java b/trustStoreMerger/src/test/java/org/onap/oom/truststoremerger/certification/file/TruststoresPathsProviderTest.java
new file mode 100644
index 00000000..d52d1899
--- /dev/null
+++ b/trustStoreMerger/src/test/java/org/onap/oom/truststoremerger/certification/file/TruststoresPathsProviderTest.java
@@ -0,0 +1,88 @@
+package org.onap.oom.truststoremerger.certification.file;
+
+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 java.util.Optional;
+
+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.onap.oom.truststoremerger.certification.file.TruststoresPathsProvider.TRUSTSTORES_ENV;
+import static org.onap.oom.truststoremerger.certification.file.TruststoresPathsProvider.TRUSTSTORES_PASSWORDS_ENV;
+
+@ExtendWith(MockitoExtension.class)
+class TruststoresPathsProviderTest {
+
+    private static final String VALID_TRUSTSTORES = "/opt/app/certificates/truststore.jks:/opt/app/certificates/truststore.pem";
+    private static final String VALID_TRUSTSTORES_PASSWORDS = "/opt/app/certificates/truststore.pass:";
+    private static final String INVALID_TRUSTSTORES = "/opt/app/certificates/truststore.jks:/opt/app/certificates/truststore.invalid";
+    private static final String INVALID_TRUSTSTORES_PASSWORDS = "/opt/app/certificates/truststore.pass:/.pass";
+
+    @Mock
+    private EnvProvider envProvider;
+    private TruststoresPathsProvider truststoresPathsProvider;
+
+    @BeforeEach
+    void setUp() {
+        truststoresPathsProvider = new TruststoresPathsProvider(envProvider, new PathValidator());
+    }
+
+    @Test
+    void shouldReturnCorrectListWhenTruststoresValid() throws TruststoresPathsProviderException {
+        mockTruststoresEnv(VALID_TRUSTSTORES);
+
+        assertThat(truststoresPathsProvider.getTruststores())
+                .contains("/opt/app/certificates/truststore.jks",
+                        "/opt/app/certificates/truststore.pem");
+    }
+
+    @Test
+    void shouldReturnCorrectListWhenTruststoresPasswordsValid() throws TruststoresPathsProviderException {
+        mockTruststoresPasswordsEnv(VALID_TRUSTSTORES_PASSWORDS);
+
+        assertThat(truststoresPathsProvider.getTruststoresPasswords())
+                .contains("/opt/app/certificates/truststore.pass",
+                        "");
+    }
+
+    @Test
+    void shouldThrowExceptionWhenTruststoresEmpty() {
+        mockTruststoresEnv("");
+
+        assertThatExceptionOfType(TruststoresPathsProviderException.class)
+                .isThrownBy(truststoresPathsProvider::getTruststores);
+    }
+
+    @Test
+    void shouldThrowExceptionWhenOneOfTruststoresPathsInvalid() {
+        mockTruststoresEnv(INVALID_TRUSTSTORES);
+
+        assertThatExceptionOfType(TruststoresPathsProviderException.class)
+                .isThrownBy(truststoresPathsProvider::getTruststores);
+    }
+
+    @Test
+    void shouldThrowExceptionWhenOneOfTruststorePasswordPathsInvalid() {
+        mockTruststoresPasswordsEnv(INVALID_TRUSTSTORES_PASSWORDS);
+
+        assertThatExceptionOfType(TruststoresPathsProviderException.class)
+                .isThrownBy(truststoresPathsProvider::getTruststoresPasswords);
+    }
+
+    private void mockTruststoresEnv(String truststores) {
+        mockEnv(truststores, TRUSTSTORES_ENV);
+    }
+
+    private void mockTruststoresPasswordsEnv(String truststoresPasswords) {
+        mockEnv(truststoresPasswords, TRUSTSTORES_PASSWORDS_ENV);
+    }
+
+    private void mockEnv(String envValue, String envName) {
+        when(envProvider.getEnv(envName))
+                .thenReturn(Optional.of(envValue));
+    }
+}
diff --git a/trustStoreMerger/src/test/java/org/onap/oom/truststoremerger/configuration/MergerConfigurationFactoryTest.java b/trustStoreMerger/src/test/java/org/onap/oom/truststoremerger/configuration/MergerConfigurationFactoryTest.java
new file mode 100644
index 00000000..336ba5da
--- /dev/null
+++ b/trustStoreMerger/src/test/java/org/onap/oom/truststoremerger/configuration/MergerConfigurationFactoryTest.java
@@ -0,0 +1,98 @@
+/*============LICENSE_START=======================================================
+ * oom-truststore-merger
+ * ================================================================================
+ * Copyright (C) 2020 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.oom.truststoremerger.configuration;
+
+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.oom.truststoremerger.certification.file.TruststoresPathsProvider;
+import org.onap.oom.truststoremerger.certification.file.TruststoresPathsProviderException;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.mockito.Mockito.when;
+
+@ExtendWith(MockitoExtension.class)
+class MergerConfigurationFactoryTest {
+
+    private static final String BASE_TRUSTSTORE_PATH = "/opt/app/truststore_";
+    private static final String TRUSTSTORE_EXTENSION = ".jks";
+    private static final String PASSWORD_EXTENSION = ".pass";
+
+    @Mock
+    private TruststoresPathsProvider pathsProvider;
+    private MergerConfigurationFactory factory;
+
+    @BeforeEach
+    void setUp() {
+        factory = new MergerConfigurationFactory(pathsProvider);
+    }
+
+    @Test
+    void shouldReturnConfigurationWithCorrectPaths() throws TruststoresPathsProviderException, MergerConfigurationException {
+        int numberOfPaths = 5;
+        List<String> truststoresPaths = createListOfPathsWithExtension(numberOfPaths, TRUSTSTORE_EXTENSION);
+        List<String> truststorePasswordPaths = createListOfPathsWithExtension(numberOfPaths, PASSWORD_EXTENSION);
+        mockPaths(truststoresPaths, truststorePasswordPaths);
+
+        MergerConfiguration configuration = factory.createConfiguration();
+
+        assertThat(configuration.getTruststoreFilePaths()).containsAll(truststoresPaths);
+        assertThat(configuration.getTruststoreFilePasswordPaths()).containsAll(truststorePasswordPaths);
+    }
+
+    @Test
+    void shouldThrowExceptionWhenTruststoresLenghtDifferentThanTruststoresPasswordsLength() throws TruststoresPathsProviderException {
+        int numberOfTruststores = 5;
+        int numberOfTruststoresPasswords = 4;
+        List<String> truststoresPaths = createListOfPathsWithExtension(numberOfTruststores, TRUSTSTORE_EXTENSION);
+        List<String> truststorePasswordPaths = createListOfPathsWithExtension(numberOfTruststoresPasswords, PASSWORD_EXTENSION);
+        mockPaths(truststoresPaths, truststorePasswordPaths);
+
+        assertThatExceptionOfType(MergerConfigurationException.class)
+                .isThrownBy(factory::createConfiguration);
+    }
+
+    private void mockPaths(List<String> truststores, List<String> truststoresPasswords) throws TruststoresPathsProviderException {
+        mockTruststores(truststores);
+        mockTruststoresPasswords(truststoresPasswords);
+    }
+
+    private void mockTruststores(List<String> truststores) throws TruststoresPathsProviderException {
+        when(pathsProvider.getTruststores()).thenReturn(truststores);
+    }
+
+    private void mockTruststoresPasswords(List<String> truststoresPasswords) throws TruststoresPathsProviderException {
+        when(pathsProvider.getTruststoresPasswords()).thenReturn(truststoresPasswords);
+    }
+
+    private List<String> createListOfPathsWithExtension(int numberOfPaths, String password_extension) {
+        List<String> paths = new ArrayList<>();
+        while (numberOfPaths-- > 0) {
+            paths.add(BASE_TRUSTSTORE_PATH + numberOfPaths + password_extension);
+        }
+        return paths;
+    }
+}