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diff --git a/cps-service/src/test/groovy/org/onap/cps/utils/JsonObjectMapperSpec.groovy b/cps-service/src/test/groovy/org/onap/cps/utils/JsonObjectMapperSpec.groovy
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+/*
+ *  ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 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.onap.cps.utils
+
+
+import com.fasterxml.jackson.databind.ObjectMapper
+import groovy.json.JsonSlurper
+import org.onap.cps.TestUtils
+import org.onap.cps.spi.exceptions.DataValidationException
+import spock.lang.Specification
+
+class JsonObjectMapperSpec extends Specification {
+
+    def spiedObjectMapper = Spy(ObjectMapper)
+    def jsonObjectMapper = new JsonObjectMapper(spiedObjectMapper)
+
+    def 'Map a structured object to json String.'() {
+        given: 'an object model'
+            def object = spiedObjectMapper.readValue(TestUtils.getResourceFileContent('bookstore.json'), Object)
+        when: 'the object is mapped to string'
+            def content = jsonObjectMapper.asJsonString(object);
+        then: 'the result is a valid json string (can be parsed)'
+            def contentMap = new JsonSlurper().parseText(content)
+        and: 'the parsed content is as expected'
+            assert contentMap.'test:bookstore'.'bookstore-name' == 'Chapters'
+    }
+
+    def 'Map a structurally compatible object to class object of specific class type T.'() {
+        given: 'a map object model'
+            def contentMap = new JsonSlurper().parseText(TestUtils.getResourceFileContent('bookstore.json'))
+        when: 'converted into a Map'
+            def result = jsonObjectMapper.convertToValueType(contentMap, Map);
+        then: 'the result is a mapped into class of type Map'
+            assert result instanceof Map
+        and: 'the map contains the expected key'
+            assert result.containsKey('test:bookstore')
+            assert result.'test:bookstore'.categories[0].name == 'SciFi'
+
+    }
+
+    def 'Mapping an unstructured json string to class object of specific class type T.'() {
+        given: 'Unstructured json string'
+            def content = '{ "nest": { "birds": "bird"] } }'
+        when: 'mapping json string to given class type'
+            def contentMap = jsonObjectMapper.convertJsonString(content, Map);
+        then: 'an exception is thrown'
+            thrown(DataValidationException)
+    }
+
+    def 'Map an incompatible object to class object of specific class type T.'() {
+        given: 'a map object model'
+            def contentMap = new JsonSlurper().parseText(TestUtils.getResourceFileContent('bookstore.json'))
+        and: 'Object mapper throws an exception'
+            spiedObjectMapper.convertValue(*_) >> { throw new IllegalArgumentException() }
+        when: 'converted into specific class type'
+            jsonObjectMapper.convertToValueType(contentMap, Object);
+        then: 'an exception is thrown'
+            thrown(DataValidationException)
+    }
+
+    def 'Map a unstructured object to json String.'() {
+        given: 'Unstructured object'
+            def object = new Object()
+        when: 'the object is mapped to string'
+            jsonObjectMapper.asJsonString(object);
+        then: 'an exception is thrown'
+            thrown(DataValidationException)
+    }
+}