message: test(common): Add test for NgForOfContext.count
  `NgForOfContext.count` is the length of the iterable.
  PR Close
diff: @@ -203,6 +203,17 @@ let thisArg: any;
  detectChangesAndExpectText('0123456789');
  }));
  + it('should display count correctly', async(() => {
  + const template = '<span *ngFor="let item of items; let len=count">{{len}}</span>';
  + fixture = createTestComponent(template);
  +
  + getComponent().items = [0, 1, 2];
  + detectChangesAndExpectText('333');
  +
  + getComponent().items = [4, 3, 2, 1, 0, -1];
  + detectChangesAndExpectText('666666');
  + }));
  +
  it('should display first item correctly', async(() => {
  const template =
  '<span *ngFor="let item of items; let isFirst=first">{{isFirst.toString()}}</span>';
  