--- /dev/null
+/*
+============LICENSE_START==========================================
+===================================================================
+Copyright (C) 2018 IBM Intellectual Property. All rights reserved.
+===================================================================
+
+Unless otherwise specified, all software contained herein is licensed
+under the Apache License, Version 2.0 (the License);
+you may not use this software 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============================================
+*/
+
+import { inject, TestBed, ComponentFixture } from '@angular/core/testing';
+import { MappingEditorService } from './mapping-editor.service';
+
+fdescribe('MappingEditorService', () => {
+    let service;
+    beforeEach(() => {
+        TestBed.configureTestingModule({
+            providers: [MappingEditorService]
+        });
+    });
+
+    beforeEach(() => {
+        service = new MappingEditorService();
+        service.editor = {};
+    })
+
+    it('should be created', inject([MappingEditorService], (service: MappingEditorService) => {
+        expect(service).toBeTruthy();
+    }));
+
+    it('should test setSelectedWord function', () => {
+        service.setSelectedWord('word');
+        expect(service.selectedWord).toBe('word');
+    });
+
+    it('should test getSelectedWord function', () => {
+        service.setSelectedWord('word');
+        expect(service.getSelectedWord()).toBe('word');
+    });
+
+    it('should test changeNav function', () => {
+        service.changeNav(null);
+        expect(service._navItem).toBe(null);
+        expect(service.referenceNameObjects).toBe(null);
+    });
+
+    it('should test changeNavAppData function', () => {
+        service.changeNavAppData(null);
+        expect(service._navItem).toBe(null);
+        expect(service.appDataObject).toBe(null);
+    });
+
+    it('should test changeNavDownloadData function', () => {
+        service.changeNavDownloadData(null);
+        expect(service._navItem).toBe(null);
+        expect(service.downloadDataObject).toBe(null);
+    });
+
+    it('should test saveLatestAction function', () => {
+        service.saveLatestAction(null);
+        expect(service.latestAction).toBe(null);
+    });
+
+    it('should test saveLatestIdentifier function', () => {
+        service.saveLatestIdentifier(null);
+        expect(service.identifier).toBe(null);
+    });
+
+    it('should test getParamContent function', () => {
+        let paramContetnt = service.getParamContent('{}');
+        expect(paramContetnt).toBe('{}');
+    });
+
+    it('should test saveTempAllData function', () => {
+        service.saveTempAllData(null);
+        expect(service.tempAllData).toBe(null);
+    });
+
+    it('should test navItem function', () => {
+        service.changeNavAppData(null);
+        let navItem = service.navItem();
+        expect(service._navItem).toBe(null);
+    });
+
+    it('should test checkToDataAdd function to return true', () => {
+        let toAdd = service.checkToDataAdd('><');
+        expect(toAdd).toBe(true);
+    });
+
+    it('should test setParamContent function', () => {
+        service.setParamContent('');
+        expect(service.paramContent).toBe('');
+    });
+
+    it('should test checkToDataAdd function to return false', () => {
+        let toAdd = service.checkToDataAdd('.');
+        expect(toAdd).toBe(false);
+    });
+});