Class AsyncMethodController<WrappingObject, FunctionName>

Controller to be used in tests, that allows for mocking and flushing any asynchronous function. For example, to mock the browser's paste functionality:

 it('can paste', () => {
  const clipboard = navigator.clipboard;
  const ctx = new AngularContext();

  // mock the browser API for pasting
  const controller = new AsyncMethodController(clipboard, 'readText');
  ctx.run(() => {
    // BEGIN production code that copies to the clipboard
    let pastedText: string;
    clipboard.readText().then((text) => {
      pastedText = text;
    });
    // END production code that copies to the clipboard

    controller.expectOne([]).flush('mock clipboard contents');

    // BEGIN expect the correct results after a successful copy
    expect(pastedText!).toBe('mock clipboard contents');
    // END expect the correct results after a successful copy
  });
});

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