Fix comment-editor.component tests (#1200)

Fix comment-editor.component tests

Async tests in `comment-editor.component.spec.ts` never fail even when
written to intentionally fail.

Let's fix the tests so that they fail when they should.

tests/app/shared/comment-editor/comment-editor.component.spec.ts

@@ -103,7 +103,7 @@ describe('CommentEditor', () => {
         buttonDe.nativeElement.click();
 
         fixture.detectChanges();
-        fixture.whenStable().then(() => {
+        await fixture.whenStable().then(() => {
           const textBox: any = debugElement.query(By.css('textarea')).nativeElement;
           expect(textBox.value).toEqual(expectedMarkup);
         });
@@ -151,7 +151,7 @@ describe('CommentEditor', () => {
         buttonDe.nativeElement.click();
         fixture.detectChanges();
 
-        fixture.whenStable().then(() => {
+        await fixture.whenStable().then(() => {
           expect(textBoxDe.nativeElement.value).toEqual(expectedMarkup);
         });
       });
@@ -188,7 +188,7 @@ describe('CommentEditor', () => {
       textBox.value = '123';
       textBox.dispatchEvent(new Event('input'));
 
-      fixture.whenStable().then(() => {
+      await fixture.whenStable().then(() => {
         expect(textBox.value).toEqual('123');
       });
     });