import { async, fakeAsync, tick } from '@angular/core/testing';

import { Observable } from 'rxjs/Observable';

describe('Angular async helper', () => {
  let actuallyDone = false;

  beforeEach(() => { actuallyDone = false; });

  afterEach(() => { expect(actuallyDone).toBe(true, 'actuallyDone should be true'); });

  it('should run normal test', () => { actuallyDone = true; });

  it('should run normal async test', (done: DoneFn) => {
    setTimeout(() => {
      actuallyDone = true;
      done();
    }, 0);
  });

  it('should run async test with task',
      async(() => { setTimeout(() => { actuallyDone = true; }, 0); }));

  it('should run async test with successful promise', async(() => {
    const p = new Promise(resolve => { setTimeout(resolve, 10); });
    p.then(() => { actuallyDone = true; });
  }));

  it('should run async test with failed promise', async(() => {
    const p = new Promise((resolve, reject) => { setTimeout(reject, 10); });
    p.catch(() => { actuallyDone = true; });
  }));

  // Fail message: Cannot use setInterval from within an async zone test
  // See https://github.com/angular/angular/issues/10127
  xit('should run async test with successful delayed Observable', async(() => {
    const source = Observable.of(true).delay(10);
    source.subscribe(
      val => actuallyDone = true,
      err => fail(err)
    );
  }));

  // Fail message: Error: 1 periodic timer(s) still in the queue
  // See https://github.com/angular/angular/issues/10127
  xit('should run async test with successful delayed Observable', fakeAsync(() => {
    const source = Observable.of(true).delay(10);
    source.subscribe(
      val => actuallyDone = true,
      err => fail(err)
    );

    tick();
  }));

});