fakeschedulers-mocha.ts

import { expect } from "chai";
import { fakeSchedulers } from "rxjs-marbles/mocha";
import { timer } from "rxjs";
import * as sinon from "sinon";

describe("timer", () => {

  let clock: sinon.SinonFakeTimers;

  beforeEach(() => {
    clock = sinon.useFakeTimers();
  });

  it("should be testable with fake time", fakeSchedulers(() => {
    let received: number | undefined;
    timer(100).subscribe(value => received = value);
    clock.tick(50);
    expect(received).to.be.undefined;
    clock.tick(50);
    expect(received).to.equal(0);
  }));

  afterEach(() => {
    clock.restore();
  });
});