1test.js

'use strict';

const expect = require('chai').expect;

describe('foo', () => {
  it('should finish', (done) => {
    Promise
    .reject(new Error())
    .catch(() => expect(false).to.be.true)
    .then(() => done(), done);
  });

  it("should finish but won't", (done) => {
    Promise.resolve(true)
    .then(() => {expect(false).to.be.true; done()}, done);
  });

  it("should be rejected but isn't", (done) => {
    Promise.resolve(true)
    .then(() => {expect(false).to.be.true; done()})
    .catch(() => done());
  });

  it("Wooooo this works", (done) => {
    Promise.resolve(true)
    .then(() => {expect(false).to.be.true; done()})
    .catch(done);
  });

});

2output.log

  foo
    1) should finish
    2) should finish but won't
    ✓ should be rejected but isn't
    3) Wooooo this works


  1 passing (2s)
  3 failing

  1) foo should finish:
     AssertionError: expected false to be true
      at /Users/colwem/workshop/autocron/test/temp.test.js:9:36
      at runMicrotasksCallback (node.js:337:7)
      at doNTCallback0 (node.js:430:9)
      at process._tickCallback (node.js:359:13)

  2) foo should finish but won't:
     Error: timeout of 2000ms exceeded. Ensure the done() callback is being called in this test.
      at null.<anonymous> (/usr/local/lib/node_modules/mocha/lib/runnable.js:170:19)
      at Timer.listOnTimeout (timers.js:92:15)

  3) foo Wooooo this works:
     AssertionError: expected false to be true
      at /Users/colwem/workshop/autocron/test/temp.test.js:26:36