chore: random test leaks (#4380)

Fixes some unit tests that were leaking elements into other tests.

src/lib/autocomplete/autocomplete.spec.ts

@@ -80,6 +80,10 @@ describe('MdAutocomplete', () => {
     TestBed.compileComponents();
   }));
 
+  afterEach(() => {
+    document.body.removeChild(overlayContainerElement);
+  });
+
   describe('panel toggling', () => {
     let fixture: ComponentFixture<SimpleAutocomplete>;
     let input: HTMLInputElement;

src/lib/core/overlay/overlay.spec.ts

@@ -393,6 +393,10 @@ describe('OverlayContainer theming', () => {
     overlayContainerElement = overlayContainer.getContainerElement();
   }));
 
+  afterEach(() => {
+    overlayContainerElement.parentNode.removeChild(overlayContainerElement);
+  });
+
   it('should be able to set a theme on the overlay container', () => {
     overlayContainer.themeClass = 'my-theme';
     expect(overlayContainerElement.classList).toContain('my-theme');

src/lib/core/overlay/position/global-position-strategy.spec.ts

@@ -17,6 +17,7 @@ describe('GlobalPositonStrategy', () => {
   });
 
   afterEach(() => {
+    element.parentNode.removeChild(element);
     strategy.dispose();
   });
 

src/lib/core/overlay/scroll/close-scroll-strategy.spec.ts

@@ -43,6 +43,10 @@ describe('CloseScrollStrategy', () => {
     componentPortal = new ComponentPortal(MozarellaMsg);
   }));
 
+  afterEach(() => {
+    overlayRef.dispose();
+  });
+
   it('should detach the overlay as soon as the user scrolls', () => {
     overlayRef.attach(componentPortal);
     spyOn(overlayRef, 'detach');

src/lib/core/overlay/scroll/reposition-scroll-strategy.spec.ts

@@ -43,6 +43,10 @@ describe('RepositionScrollStrategy', () => {
     componentPortal = new ComponentPortal(PastaMsg);
   }));
 
+  afterEach(() => {
+    overlayRef.dispose();
+  });
+
   it('should update the overlay position when the page is scrolled', () => {
     overlayRef.attach(componentPortal);
     spyOn(overlayRef, 'updatePosition');

src/lib/snack-bar/snack-bar.spec.ts

@@ -349,6 +349,7 @@ describe('MdSnackBar with parent MdSnackBar', () => {
   let childSnackBar: MdSnackBar;
   let overlayContainerElement: HTMLElement;
   let fixture: ComponentFixture<ComponentThatProvidesMdSnackBar>;
+  let liveAnnouncer: LiveAnnouncer;
 
   beforeEach(async(() => {
     TestBed.configureTestingModule({
@@ -365,8 +366,9 @@ describe('MdSnackBar with parent MdSnackBar', () => {
     TestBed.compileComponents();
   }));
 
-  beforeEach(inject([MdSnackBar], (sb: MdSnackBar) => {
+  beforeEach(inject([MdSnackBar, LiveAnnouncer], (sb: MdSnackBar, la: LiveAnnouncer) => {
     parentSnackBar = sb;
+    liveAnnouncer = la;
 
     fixture = TestBed.createComponent(ComponentThatProvidesMdSnackBar);
     childSnackBar = fixture.componentInstance.snackBar;
@@ -375,6 +377,7 @@ describe('MdSnackBar with parent MdSnackBar', () => {
 
   afterEach(() => {
     overlayContainerElement.innerHTML = '';
+    liveAnnouncer._removeLiveElement();
   });
 
   it('should close snackBars opened by parent when opening from child MdSnackBar', fakeAsync(() => {

src/lib/tooltip/tooltip.spec.ts

@@ -50,6 +50,10 @@ describe('MdTooltip', () => {
     TestBed.compileComponents();
   }));
 
+  afterEach(() => {
+    document.body.removeChild(overlayContainerElement);
+  });
+
   describe('basic usage', () => {
     let fixture: ComponentFixture<BasicTooltipDemo>;
     let buttonDebugElement: DebugElement;