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

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+import {async, ComponentFixture, fakeAsync, TestBed, tick} from '@angular/core/testing';
+
+import {SongComponent} from './song.component';
+import {of} from 'rxjs';
+import {ActivatedRoute} from '@angular/router';
+
+describe('SongComponent', () => {
+  let component: SongComponent;
+  let fixture: ComponentFixture<SongComponent>;
+
+  const mockActivatedRoute = {
+    params: of({songId: '4711'})
+  };
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [SongComponent],
+      providers: [
+        {provide: ActivatedRoute, useValue: mockActivatedRoute}
+      ]
+    })
+      .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(SongComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+
+  it('should provide songId', fakeAsync(() => {
+    tick();
+    expect(component.songId).toBe('4711');
+  }));
+});