Add tests for SearchService

src/app/+search-page/search-service/search.service.spec.ts

@@ -0,0 +1,56 @@
+import { TestBed, fakeAsync, tick } from '@angular/core/testing';
+import { RouterTestingModule } from '@angular/router/testing';
+
+import { CommonModule } from '@angular/common';
+import { Component } from '@angular/core';
+import { Router } from '@angular/router';
+
+import { SearchService } from './search.service';
+import { ItemDataService } from './../../core/data/item-data.service';
+import { ViewMode } from '../../+search-page/search-options.model';
+
+@Component({ template: '' })
+class DummyComponent { }
+
+describe('SearchService', () => {
+  let searchService: SearchService;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({
+      imports: [
+        CommonModule,
+        RouterTestingModule.withRoutes([
+          { path: 'search', component: DummyComponent, pathMatch: 'full' },
+        ])
+      ],
+      declarations: [
+        DummyComponent
+      ],
+      providers: [
+        { provide: ItemDataService, useValue: {} },
+        SearchService
+      ],
+    });
+    searchService = TestBed.get(SearchService);
+  });
+
+  it('should return list view mode by default', () => {
+    searchService.getViewMode().subscribe((viewMode) => {
+      expect(viewMode).toBe(ViewMode.List);
+    });
+  });
+
+  it('should return the view mode set through setViewMode', fakeAsync(() => {
+    searchService.setViewMode(ViewMode.Grid)
+    tick();
+    let viewMode = ViewMode.List;
+    searchService.getViewMode().subscribe((mode) => viewMode = mode);
+    expect(viewMode).toBe(ViewMode.Grid);
+
+    searchService.setViewMode(ViewMode.List)
+    tick();
+    searchService.getViewMode().subscribe((mode) => viewMode = mode);
+    expect(viewMode).toBe(ViewMode.List);
+  }));
+
+});