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diff --git a/src/test/java/org/onap/aai/cacher/service/rest/util/CacheKeyRequestValidationTest.java b/src/test/java/org/onap/aai/cacher/service/rest/util/CacheKeyRequestValidationTest.java
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+++ b/src/test/java/org/onap/aai/cacher/service/rest/util/CacheKeyRequestValidationTest.java
@@ -0,0 +1,90 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.aai
+ * ================================================================================
+ * Copyright © 2017-2018 AT&T Intellectual Property. 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.aai.cacher.service.rest.util;
+
+import com.google.gson.JsonParser;
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.Mockito;
+import org.onap.aai.cacher.service.helper.CacheHelperService;
+
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+public class CacheKeyRequestValidationTest {
+	
+    protected CacheHelperService cacheHelperService;
+    protected CacheKeyRequestValidation addCacheKeyRequestValidation;
+    protected CacheKeyRequestValidation updateCacheKeyRequestValidation;
+    
+	private String emptyPayload = "{}";
+	private String nonEmptyPayload = "{\"cacheKey\" : \"complex\"}";
+	private JsonParser parser;
+    
+    @Before
+    public void setup() {
+    	cacheHelperService = Mockito.mock(CacheHelperService.class);
+    	addCacheKeyRequestValidation = new CacheKeyRequestValidation(CacheKeyRequestValidationType.ADD);
+    	updateCacheKeyRequestValidation = new CacheKeyRequestValidation(CacheKeyRequestValidationType.UPDATE);
+    	parser = new JsonParser();
+    }
+    
+    @Test
+    public void testNullPayload() {
+    	List<String> results = addCacheKeyRequestValidation.validateCacheKeyRequest(null, cacheHelperService);
+    	assertEquals("null payload ok", "Unsupported CacheKey request format, empty payload.", results.get(0));
+    }
+    
+    @Test
+    public void testEmptyPayload() {
+    	List<String> results = addCacheKeyRequestValidation.validateCacheKeyRequest(parser.parse(emptyPayload).getAsJsonObject(), cacheHelperService);
+    	assertEquals("empty payload ok", "Unsupported CacheKey request format, unspecified cacheKey.", results.get(0));
+    }
+    
+    @Test
+    public void testAddNewCacheKey() {
+    	Mockito.when(cacheHelperService.isKeyPresent(Mockito.any(), Mockito.anyString())).thenReturn(false);
+    	List<String> results = addCacheKeyRequestValidation.validateCacheKeyRequest(parser.parse(nonEmptyPayload).getAsJsonObject(), cacheHelperService);
+    	assertEquals("add new CacheKey ok", 0, results.size());
+    }
+    
+    @Test
+    public void testAddExistingCacheKey() {
+    	Mockito.when(cacheHelperService.isKeyPresent(Mockito.any(), Mockito.anyString())).thenReturn(true);
+    	List<String> results = addCacheKeyRequestValidation.validateCacheKeyRequest(parser.parse(nonEmptyPayload).getAsJsonObject(), cacheHelperService);
+    	assertEquals("add existing CacheKey ok", "Invalid request to add cacheKey complex, cacheKey exists.", results.get(0));
+    }
+    
+    
+    @Test
+    public void testUpdateNewCacheKey() {
+    	Mockito.when(cacheHelperService.isKeyPresent(Mockito.any(), Mockito.anyString())).thenReturn(false);
+    	List<String> results = updateCacheKeyRequestValidation.validateCacheKeyRequest(parser.parse(nonEmptyPayload).getAsJsonObject(), cacheHelperService);
+    	assertEquals("update new CacheKey ok", "Invalid request to update cacheKey complex, cacheKey does not exist.", results.get(0));
+    }
+    
+    @Test
+    public void testUpdateExistingCacheKey() {
+    	Mockito.when(cacheHelperService.isKeyPresent(Mockito.any(), Mockito.anyString())).thenReturn(true);
+    	List<String> results = updateCacheKeyRequestValidation.validateCacheKeyRequest(parser.parse(nonEmptyPayload).getAsJsonObject(), cacheHelperService);
+    	assertEquals("update existing CacheKey ok", 0, results.size());
+    }   
+}