Create link head spec file

src/app/core/services/link-head.service.spec.ts

@@ -0,0 +1,45 @@
+import { DOCUMENT } from '@angular/common';
+import { Renderer2, RendererFactory2 } from '@angular/core';
+import { TestBed, waitForAsync } from '@angular/core/testing';
+import { MockProvider } from 'ng-mocks';
+import { LinkHeadService } from './link-head.service';
+
+describe('LinkHeadService', () => {
+
+    let service: LinkHeadService;
+
+    const renderer2: Renderer2 = {
+        createRenderer: jasmine.createSpy('createRenderer'),
+        createElement: jasmine.createSpy('createElement'),
+        setAttribute: jasmine.createSpy('setAttribute'),
+        appendChild: jasmine.createSpy('appendChild')
+    } as unknown as Renderer2;
+
+    beforeEach(waitForAsync(() => {
+        return TestBed.configureTestingModule({
+          providers: [
+            MockProvider(RendererFactory2, {
+                createRenderer: () => renderer2
+            }),
+            { provide: Document, useExisting: DOCUMENT },
+          ]
+        });
+    }));
+
+    beforeEach(() => {
+        service = new LinkHeadService(TestBed.inject(RendererFactory2), TestBed.inject(DOCUMENT));
+    });
+
+    describe('link', () => {
+        it('should create a link tag', () => {
+            const link = service.addTag({
+                href: 'test',
+                type: 'application/atom+xml',
+                rel: 'alternate',
+                title: 'Sitewide Atom feed'
+              });
+            expect(link).not.toBeUndefined();
+        });
+    });
+
+});

src/app/core/services/link-head.service.ts

@@ -12,7 +12,13 @@ export class LinkHeadService {
   ) {
 
   }
-  addTag(tag: LinkDefinition, forceCreation?: boolean) {
+
+  /**
+   * Method to create a Link tag in the HEAD of the html.
+   * @param tag LinkDefition is the paramaters to define a link tag.
+   * @returns Link tag that was created
+   */
+  addTag(tag: LinkDefinition) {
 
     try {
       const renderer = this.rendererFactory.createRenderer(this.document, {
@@ -23,7 +29,8 @@ export class LinkHeadService {
       });
 
       const link = renderer.createElement('link');
-
+      console.log(tag);
+      console.log(link);
       const head = this.document.head;
 
       if (head === null) {
@@ -35,12 +42,16 @@ export class LinkHeadService {
       });
 
       renderer.appendChild(head, link);
-
+      return renderer;
     } catch (e) {
       console.error('Error within linkService : ', e);
     }
   }
 
+  /**
+   * Removes a link tag in header based on the given attrSelector.
+   * @param attrSelector The attr assigned to a link tag which will be used to determine what link to remove.
+   */
   removeTag(attrSelector: string) {
     if (attrSelector) {
       try {