test(material-experimental/mdc-tabs): fix failing tests (#19165)

Recently #16869 was merged which was created before we had MDC-based tabs which means that the MDC tests were never updated.

Author: crisbeto

src/material-experimental/mdc-tabs/tab-nav-bar/tab-nav-bar.spec.ts

@@ -147,27 +147,29 @@ describe('MDC-based MatTabNavBar', () => {
       expect(tabLinkElement.classList).toContain('mat-mdc-tab-disabled');
     });
 
-    it('should re-align the ink bar when the direction changes', () => {
+    it('should re-align the ink bar when the direction changes', fakeAsync(() => {
       const inkBar = fixture.componentInstance.tabNavBar._inkBar;
 
       spyOn(inkBar, 'alignToElement');
 
       dirChange.next();
+      tick();
       fixture.detectChanges();
 
       expect(inkBar.alignToElement).toHaveBeenCalled();
-    });
+    }));
 
-    it('should re-align the ink bar when the tabs list change', () => {
+    it('should re-align the ink bar when the tabs list change', fakeAsync(() => {
       const inkBar = fixture.componentInstance.tabNavBar._inkBar;
 
       spyOn(inkBar, 'alignToElement');
 
       fixture.componentInstance.tabs = [1, 2, 3, 4];
       fixture.detectChanges();
+      tick();
 
       expect(inkBar.alignToElement).toHaveBeenCalled();
-    });
+    }));
 
     it('should re-align the ink bar when the tab labels change the width', done => {
       const inkBar = fixture.componentInstance.tabNavBar._inkBar;