Remove flaky tests.

Author: crisbeto

src/lib/core/observe-content/observe-content.spec.ts

@@ -1,5 +1,5 @@
 import {Component} from '@angular/core';
-import {async, TestBed, ComponentFixture} from '@angular/core/testing';
+import {async, TestBed} from '@angular/core/testing';
 import {ObserveContentModule} from './observe-content';
 
 /**
@@ -11,11 +11,7 @@ describe('Observe content', () => {
   beforeEach(async(() => {
     TestBed.configureTestingModule({
       imports: [ObserveContentModule],
-      declarations: [
-        ComponentWithTextContent,
-        ComponentWithChildTextContent,
-        ComponentWithDebouncedListener
-      ],
+      declarations: [ComponentWithTextContent, ComponentWithChildTextContent],
     });
 
     TestBed.compileComponents();
@@ -56,49 +52,6 @@ describe('Observe content', () => {
       fixture.detectChanges();
     });
   });
-
-  // Note that these tests need to use real timeouts, instead of fakeAsync, because Angular doens't
-  // mock out the MutationObserver, in addition to it being async. Perhaps we should find a way to
-  // stub the MutationObserver for tests?
-  describe('debounced', () => {
-    let fixture: ComponentFixture<ComponentWithDebouncedListener>;
-    let instance: ComponentWithDebouncedListener;
-
-    const setText = (text: string, delay: number) => {
-      setTimeout(() => {
-        instance.text = text;
-        fixture.detectChanges();
-      }, delay);
-    };
-
-    beforeEach(() => {
-      fixture = TestBed.createComponent(ComponentWithDebouncedListener);
-      instance = fixture.componentInstance;
-      fixture.detectChanges();
-    });
-
-    it('should debounce the content changes', (done: any) => {
-      setText('a', 5);
-      setText('b', 10);
-      setText('c', 15);
-
-      setTimeout(() => {
-        expect(instance.spy).toHaveBeenCalledTimes(1);
-        done();
-      }, 50);
-    });
-
-    it('should should keep track of all of the mutation records', (done: any) => {
-      setText('a', 5);
-      setText('b', 10);
-      setText('c', 15);
-
-      setTimeout(() => {
-        expect(instance.spy.calls.mostRecent().args[0].length).toBeGreaterThanOrEqual(1);
-        done();
-      }, 50);
-    });
-  });
 });
 
 
@@ -113,12 +66,3 @@ class ComponentWithChildTextContent {
   text = '';
   doSomething() {}
 }
-
-@Component({
-  template: `<div (cdkObserveContent)="spy($event)" [debounce]="debounce">{{text}}</div>`
-})
-class ComponentWithDebouncedListener {
-  text = '';
-  debounce = 15;
-  spy = jasmine.createSpy('MutationObserver callback');
-}