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src/app/modules/songs/song-list/song-list.component.spec.ts

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+import {async, ComponentFixture, fakeAsync, TestBed, tick} from '@angular/core/testing';
+
+import {SongListComponent} from './song-list.component';
+import {of} from 'rxjs';
+import {SongService} from '../services/song.service';
+import {NO_ERRORS_SCHEMA} from '@angular/core';
+
+describe('SongListComponent', () => {
+  let component: SongListComponent;
+  let fixture: ComponentFixture<SongListComponent>;
+
+  const songs = [
+    {title: 'title1'}
+  ];
+
+  const mockSongService = {
+    list: () => of(songs)
+  };
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [SongListComponent],
+      providers: [
+        {provide: SongService, useValue: mockSongService}
+      ],
+      schemas: [NO_ERRORS_SCHEMA]
+    })
+      .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(SongListComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+
+  it('should read songs from SongService', fakeAsync(() => {
+    tick();
+    expect(component.songs$).toEqual([
+      {title: 'title1'}
+    ] as any);
+  }));
+});