rx-well-tests.tsx

import { of } from 'rxjs';
import { flatMap, tap } from 'rxjs/operators';

describe('containers', () => {
  it('promise works', () => {
    const c =
      Promise.resolve(1).then(a =>
        Promise.resolve(2).then(b =>
          a + b
        )
      );

    return c.then((d: number) => expect(d).toBe(3));
  });

  it('async/await works', async () => {
    const a = await Promise.resolve(1);
    const b = await Promise.resolve(2);
    const c = a + b;

    expect(c).toBe(3);
  });

  it('rx works', () => {
    const c =
      of(1).pipe(flatMap(a =>
        of(2).pipe(flatMap(b =>
          of(a + b)
        ))
      ));

    c.pipe(
      tap((d: number) => expect(d).toBe(3)),
    );
  });
});