fix(@angular-devkit/build-angular): serve assets

Author: hybrist

packages/angular_devkit/build_angular/src/builders/karma/tests/options/styles_spec.ts

@@ -38,8 +38,9 @@ describeKarmaBuilder(execute, KARMA_BUILDER_INFO, (harness, setupTarget) => {
               declarations: [AppComponent]
             }));
 
-            it('should not contain text that is hidden via css', () => {
+            it('should not contain text that is hidden via css', async () => {
               const fixture = TestBed.createComponent(AppComponent);
+              await fixture.whenStable();
               expect(fixture.nativeElement.innerText).not.toContain('Hello World');
             });
           });`,
@@ -101,8 +102,9 @@ describeKarmaBuilder(execute, KARMA_BUILDER_INFO, (harness, setupTarget) => {
             imports: [HttpClientModule],
             declarations: [AppComponent]
           }));
-          it('should create the app', () => {
+          it('should create the app', async () => {
             const fixture = TestBed.createComponent(AppComponent);
+            await fixture.whenStable();
             const app = fixture.debugElement.componentInstance;
             expect(app).toBeTruthy();
           });