Async testing examples #testing

async-examples.spec.ts

import { isMainThread } from "worker_threads";

fdescribe("Async testing examples", () => {
  it("Asynchronous test example with jasmine done()", (done: DoneFn) => {
    let test = false;
    setTimeout(() => {
      console.log("running assertions");
      test = true;
      expect(test).toBeTruthy();
      done();
    });
  });

  it("Asynchronous test example with jasmine tick()", fakeAsync(() => {
    let test = false;
    setTimeout(() => {
      console.log("running assertions");
      test = true;
    }, 1000);
    tick(1000);
    expect(test).toBeTruthy();
  }));

  it("Asynchronous test example with jasmine flush()", fakeAsync(() => {
    let test = false;
    setTimeout(() => {
      console.log("running assertions");
      test = true;
    }, 1000);
    flush();
    expect(test).toBeTruthy();
  }));

  it("Asynchronous test with promises with flushMicrotasks()", fakeAsync(() => {
    let test = false;
    Promise.resolve().then(() => {
      test = true;
    });
    flushMicrotasks();
    expect(test).toBeTruthy();
  }));
});