Does fakeAsync guarantee promise completion after tick/flushMicroservice

Question

Main issue is how to test that expected actions were performed once a Promise was completed, for example to test if a component correctly updates its states after receiving

Answer 1

So yes, as Thierry explained in his answer fakeAsync allows testing synchronously the business logic behind handling promises.

I just wanted to add, that the test for fakeAsync have even specs for promise related scenarios:

describe('Promise', () => {
      it('should run asynchronous code', fakeAsync(() => {
...
      it('should run chained thens', fakeAsync(() => {
...
      it('should run Promise created in Promise', fakeAsync(() => {

I found those tests at: https://github.com/angular/angular/blob/master/packages/core/test/fake_async_spec.ts