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src/app/modules/songs/services/song.service.spec.ts

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+import {async, TestBed} from '@angular/core/testing';
+
+import {SongService} from './song.service';
+import {SongDataService} from './song-data.service';
+import {of} from 'rxjs';
+
+describe('SongService', () => {
+
+  const songs = [
+    {title: 'title1'}
+  ];
+
+  const mockSongDataService = {
+    list: () => of(songs)
+  };
+
+  beforeEach(() => TestBed.configureTestingModule({
+    providers: [
+      {provide: SongDataService, useValue: mockSongDataService}
+    ]
+  }));
+
+  it('should be created', () => {
+    const service: SongService = TestBed.get(SongService);
+    expect(service).toBeTruthy();
+  });
+
+  it('should list songs', async(() => {
+    const service: SongService = TestBed.get(SongService);
+    service.list$().subscribe(s => {
+      expect(s).toEqual([
+        {title: 'title1'}
+      ] as any);
+    });
+  }));
+});