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diff --git a/openecomp-be/lib/openecomp-tosca-converter-lib/openecomp-tosca-converter-core/src/test/java/org/openecomp/core/impl/ToscaConverterImplTest.java b/openecomp-be/lib/openecomp-tosca-converter-lib/openecomp-tosca-converter-core/src/test/java/org/openecomp/core/impl/ToscaConverterImplTest.java
new file mode 100644
index 0000000000..3e4e62a0d1
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+++ b/openecomp-be/lib/openecomp-tosca-converter-lib/openecomp-tosca-converter-core/src/test/java/org/openecomp/core/impl/ToscaConverterImplTest.java
@@ -0,0 +1,296 @@
+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation
+ *  ================================================================================
+ *  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.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *  ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.core.impl;
+
+import org.apache.commons.collections.CollectionUtils;
+import org.junit.Assert;
+import org.junit.Test;
+import org.onap.sdc.tosca.datatypes.model.*;
+import org.onap.sdc.tosca.services.ToscaExtensionYamlUtil;
+import org.onap.sdc.tosca.services.YamlUtil;
+import org.openecomp.core.converter.ToscaConverter;
+import org.openecomp.core.utilities.file.FileContentHandler;
+import org.openecomp.core.utilities.file.FileUtils;
+import org.openecomp.core.utilities.json.JsonUtil;
+import org.openecomp.sdc.tosca.datatypes.ToscaServiceModel;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.nio.file.NotDirectoryException;
+import java.util.*;
+
+import static org.junit.Assert.assertEquals;
+import static org.openecomp.core.converter.datatypes.Constants.globalStName;
+import static org.openecomp.core.converter.datatypes.Constants.mainStName;
+
+public class ToscaConverterImplTest {
+
+  private static final ToscaConverter toscaConverter = new ToscaConverterImpl();
+  private static final String VIRTUAL_LINK = "virtualLink";
+  private static final String UNBOUNDED = "UNBOUNDED";
+  private static final String BASE_DIR = "/mock/toscaConverter";
+
+
+  @Test
+  public void testConvertMainSt() throws IOException {
+    String inputFilesPath = BASE_DIR + "/convertMainSt/in";
+    String outputFilesPath = BASE_DIR + "/convertMainSt/out";
+
+    convertAndValidate(inputFilesPath, outputFilesPath);
+  }
+
+  @Test
+  public void testNodesConversion() throws IOException {
+    String inputFilesPath = BASE_DIR + "/convertCsar/in";
+    String outputFilesPath = BASE_DIR + "/convertCsar/out";
+
+    convertAndValidate(inputFilesPath, outputFilesPath);
+  }
+
+  @Test
+  public void testParameterConversion() throws IOException {
+    String inputFilesPath = BASE_DIR + "/convertParameters/in";
+    String outputFilesPath = BASE_DIR + "/convertParameters/out";
+
+    convertAndValidate(inputFilesPath, outputFilesPath);
+  }
+
+  @Test
+  public void testConversionWithInt() throws IOException {
+    String inputFilesPath = BASE_DIR + "/conversionWithInt/in";
+    String outputFilesPath = BASE_DIR + "/conversionWithInt/out";
+
+    convertAndValidate(inputFilesPath, outputFilesPath);
+  }
+
+  @Test
+  public void testOccurrencesUpperString() {
+    Object[] occurrences = buildOccurrences("0", UNBOUNDED);
+    Assert.assertEquals(occurrences[0], 0);
+    Assert.assertEquals(occurrences[1], UNBOUNDED);
+  }
+
+  @Test
+  public void testOccurrencesAsInts() {
+    Object[] occurrences = buildOccurrences("0", "1");
+    Assert.assertEquals(occurrences[0], 0);
+    Assert.assertEquals(occurrences[1], 1);
+  }
+
+  @Test
+  public void testOccurrencesAsStrings() {
+    String test = "TEST_A";
+    Object[] occurrences = buildOccurrences(UNBOUNDED, test);
+    Assert.assertEquals(occurrences[0], UNBOUNDED);
+    Assert.assertEquals(occurrences[1], test);
+  }
+
+  @Test
+  public void testOccurrencesLowerString() {
+    Object[] occurrences = buildOccurrences(UNBOUNDED, "100");
+    Assert.assertEquals(occurrences[0], UNBOUNDED);
+    Assert.assertEquals(occurrences[1], 100);
+  }
+
+  @Test
+  public void testOccurrencesEmpty() {
+    Object[] occurrences = buildOccurrences();
+    Assert.assertEquals(occurrences.length, 0);
+  }
+
+  @Test
+  public void testOccurrencesMany() {
+    String test = "TEST_B";
+    Object[] occurrences = buildOccurrences("1", "2", test);
+    Assert.assertEquals(occurrences[0], 1);
+    Assert.assertEquals(occurrences[1], 2);
+    Assert.assertEquals(occurrences[2], test);
+  }
+
+  @Test
+  public void testDefaultOccurrences() {
+    Object[] occurrences = buildOccurrences((List<String>) null);
+    Assert.assertEquals(1, occurrences[0]);
+    Assert.assertEquals(1, occurrences[1]);
+  }
+
+  private Object[] buildOccurrences(String... bounds) {
+    return buildOccurrences(Arrays.asList(bounds));
+  }
+
+  private void convertAndValidate(String inputFilesPath, String outputFilesPath)
+      throws IOException {
+    FileContentHandler fileContentHandler =
+        createFileContentHandlerFromInput(inputFilesPath);
+
+    ToscaServiceModel toscaServiceModel = toscaConverter.convert(fileContentHandler);
+    validateConvertorOutput(outputFilesPath, toscaServiceModel);
+  }
+
+  private void validateConvertorOutput(String outputFilesPath, ToscaServiceModel toscaServiceModel)
+      throws IOException {
+    ServiceTemplate mainSt = toscaServiceModel.getServiceTemplates().get(mainStName);
+    Map<String, ServiceTemplate> expectedOutserviceTemplates = new HashMap<>();
+    loadServiceTemplates(outputFilesPath, new ToscaExtensionYamlUtil(),
+        expectedOutserviceTemplates);
+
+    checkSTResults(expectedOutserviceTemplates, null, mainSt);
+  }
+
+  private Object[] buildOccurrences(List<String> bounds) {
+    NodeType nodeType = JsonUtil.json2Object("{derived_from=tosca.nodes.Root, description=MME_VFC, " +
+            "properties={vendor={type=string, default=ERICSSON}, " +
+            "csarVersion={type=string, default=v1.0}, csarProvider={type=string, default=ERICSSON}, " +
+            "id={type=string, default=vMME}, version={type=string, default=v1.0}, csarType={type=string, default=NFAR}}, " +
+            "requirements=[{virtualLink={" +
+            (bounds == null ? "" : "occurrences=[" + String.join(", ", bounds) +   "], ") +
+            "capability=tosca.capabilities.network.Linkable}}]}", NodeType.class);
+    List<Map<String, RequirementDefinition>> requirements = nodeType.getRequirements();
+    return requirements.get(0).get(VIRTUAL_LINK).getOccurrences();
+  }
+
+  private FileContentHandler createFileContentHandlerFromInput(String inputFilesPath)
+      throws IOException {
+    URL inputFilesUrl = this.getClass().getResource(inputFilesPath);
+    String path = inputFilesUrl.getPath();
+    File directory = new File(path);
+    File[] listFiles = directory.listFiles();
+
+    FileContentHandler fileContentHandler = new FileContentHandler();
+    insertFilesIntoFileContentHandler(listFiles, fileContentHandler);
+    return fileContentHandler;
+  }
+
+  private void insertFilesIntoFileContentHandler(File[] listFiles,
+                                                 FileContentHandler fileContentHandler)
+      throws IOException {
+    byte[] fileContent;
+    if(CollectionUtils.isEmpty(fileContentHandler.getFileList())) {
+      fileContentHandler.setFiles(new HashMap<>());
+    }
+
+    for (File file : listFiles) {
+      if(!file.isDirectory()) {
+        try (FileInputStream fis = new FileInputStream(file)) {
+          fileContent = FileUtils.toByteArray(fis);
+          fileContentHandler.addFile(file.getPath(), fileContent);
+        }
+      }else{
+        File[] currFileList = file.listFiles();
+        insertFilesIntoFileContentHandler(currFileList, fileContentHandler);
+      }
+
+    }
+  }
+
+  private void checkSTResults(
+      Map<String, ServiceTemplate> expectedOutserviceTemplates,
+      ServiceTemplate gloablSubstitutionServiceTemplate, ServiceTemplate mainServiceTemplate) {
+    YamlUtil yamlUtil = new YamlUtil();
+    if (Objects.nonNull(gloablSubstitutionServiceTemplate)) {
+      assertEquals("difference global substitution service template: ",
+          yamlUtil.objectToYaml(expectedOutserviceTemplates.get(globalStName)),
+          yamlUtil.objectToYaml(gloablSubstitutionServiceTemplate));
+    }
+    if (Objects.nonNull(mainServiceTemplate)) {
+      assertEquals("difference main service template: ",
+          yamlUtil.objectToYaml(expectedOutserviceTemplates.get(mainStName)),
+          yamlUtil.objectToYaml(mainServiceTemplate));
+    }
+  }
+
+  public static void loadServiceTemplates(String serviceTemplatesPath,
+                                          ToscaExtensionYamlUtil toscaExtensionYamlUtil,
+                                          Map<String, ServiceTemplate> serviceTemplates)
+      throws IOException {
+    URL urlFile = ToscaConverterImplTest.class.getResource(serviceTemplatesPath);
+    if (urlFile != null) {
+      File pathFile = new File(urlFile.getFile());
+      File[] files = pathFile.listFiles();
+      if (files != null) {
+        addServiceTemplateFiles(serviceTemplates, files, toscaExtensionYamlUtil);
+      } else {
+        throw new NotDirectoryException(serviceTemplatesPath);
+      }
+    } else {
+      throw new NotDirectoryException(serviceTemplatesPath);
+    }
+  }
+
+  private static void addServiceTemplateFiles(Map<String, ServiceTemplate> serviceTemplates,
+                                              File[] files,
+                                              ToscaExtensionYamlUtil toscaExtensionYamlUtil) throws IOException {
+
+    for (File file : files) {
+
+      try (InputStream yamlFile = new FileInputStream(file)) {
+        ServiceTemplate serviceTemplateFromYaml =
+            toscaExtensionYamlUtil.yamlToObject(yamlFile, ServiceTemplate.class);
+        createConcreteRequirementObjectsInServiceTemplate(serviceTemplateFromYaml, toscaExtensionYamlUtil);
+        serviceTemplates.put(file.getName(), serviceTemplateFromYaml);
+      }
+    }
+  }
+
+  private static void createConcreteRequirementObjectsInServiceTemplate(ServiceTemplate
+                                                                            serviceTemplateFromYaml,
+                                                                        ToscaExtensionYamlUtil
+                                                                            toscaExtensionYamlUtil) {
+
+    if (serviceTemplateFromYaml == null
+        || serviceTemplateFromYaml.getTopology_template() == null
+        || serviceTemplateFromYaml.getTopology_template().getNode_templates() == null) {
+      return;
+    }
+
+    //Creating concrete objects
+    Map<String, NodeTemplate> nodeTemplates =
+        serviceTemplateFromYaml.getTopology_template().getNode_templates();
+    for (Map.Entry<String, NodeTemplate> entry : nodeTemplates.entrySet()) {
+      NodeTemplate nodeTemplate = entry.getValue();
+      List<Map<String, RequirementAssignment>> requirements = nodeTemplate.getRequirements();
+      List<Map<String, RequirementAssignment>> concreteRequirementList = new ArrayList<>();
+      if (requirements != null) {
+        ListIterator<Map<String, RequirementAssignment>> reqListIterator = requirements
+            .listIterator();
+        while (reqListIterator.hasNext()){
+          Map<String, RequirementAssignment> requirement = reqListIterator.next();
+          Map<String, RequirementAssignment> concreteRequirement = new HashMap<>();
+          for (Map.Entry<String, RequirementAssignment> reqEntry : requirement.entrySet()) {
+            RequirementAssignment requirementAssignment = (toscaExtensionYamlUtil
+                .yamlToObject(toscaExtensionYamlUtil.objectToYaml(reqEntry.getValue()),
+                    RequirementAssignment.class));
+            concreteRequirement.put(reqEntry.getKey(), requirementAssignment);
+            concreteRequirementList.add(concreteRequirement);
+            reqListIterator.remove();
+          }
+        }
+        requirements.clear();
+        requirements.addAll(concreteRequirementList);
+        nodeTemplate.setRequirements(requirements);
+      }
+      System.out.println();
+      //toscaExtensionYamlUtil.yamlToObject(nodeTemplate, NodeTemplate.class);
+    }
+  }
+}