describe('behaviors', () => {
    let testDebugElement: DebugElement;
    let testNativeElement: HTMLElement;
    let testInstance: MdcTabBarScroller;
    let testComponent: ScrollingTabs;

    beforeEach(() => {
      fixture = TestBed.createComponent(ScrollingTabs);
      fixture.detectChanges();

      testDebugElement = fixture.debugElement.query(By.directive(MdcTabBarScroller));
      testNativeElement = testDebugElement.nativeElement;
      testInstance = testDebugElement.componentInstance;
      testComponent = fixture.debugElement.componentInstance;
    });

    it('#should have mdc-tab-bar-scroller by default', () => {
      expect(testDebugElement.nativeElement.classList)
        .toContain('mdc-tab-bar-scroller', 'Expected to have mdc-tab-bar-scroller');
    });

    it('#should scrollToTabAtIndex', () => {
      expect(testInstance.scrollToTabAtIndex(2));
    });

    it('#should scroll forward', () => {
      expect(testInstance.scrollForward());
    });

    it('#should scroll back', () => {
      expect(testInstance.scrollBack());
    });

    it('#should refresh layout', () => {
      expect(testInstance.layout());
    });
  });

 it('#should refresh layout', () => {
   expect(testInstance.layout());
 });