runAllTimers is a superset of runAllTicks, but only sometimes

[cesarkawakami]

Do you want to request a feature or report a bug?

A bug, or a documentation issue.

What is the current behavior?

The following code and test work:

// code
const tickThenTimeout = (state) => {
  process.nextTick(() => {
    setTimeout(() => {
      state.ok = true;
    });
  });
};

// test
it('tickThenTimeout should work', () => {
  const state = { ok: false };
  timers.tickThenTimeout(state);
  expect(state.ok).toBe(false);
  jest.runAllTimers();
  expect(state.ok).toBe(true);
});

This could make one believe that runAllTimers is a superset of runAllTicks. Current implementation here would also make one believe so, since it calls runAllTicks() at the beginning of the function.

But the following code/test don't work:

// code
const timeoutThenTick = (state) => {
  setTimeout(() => {
    process.nextTick(() => {
      state.ok = true;
    });
  }, 0);
};

// test
it('timeoutThenTick should work?', () => {
  const state = { ok: false };
  timers.timeoutThenTick(state);
  expect(state.ok).toBe(false);
  jest.runAllTimers();
  expect(state.ok).toBe(true);
});

My impression is that this behavior is inconsistent:

• The docs mention that runAllTicks works exclusively for the micro-queue, and runAllTimers for the macro-queue. But the code above shows that runAllTimers affects both micro and macro tasks.

• Even though runAllTimers dispatches micro-queues in some cases, it doesn't do so in all of them, as shown by test cases above.

If the current behavior is a bug, please provide the steps to reproduce and either a repl.it demo through https://repl.it/languages/jest or a minimal repository on GitHub that we can yarn install and yarn test.

The following repo:

https://github.com/cesarkawakami/jest-bug-runalltimers

is yarn test-able for the behavior explained above.

What is the expected behavior?

Both tests above pass / yarn test passes on given repository above.

Please provide your exact Jest configuration and mention your Jest, node, yarn/npm version and operating system.

Jest: 19.0.2
Node: v7.6.0
Yarn: 0.18.2
OS: macOS Sierra 10.12.3

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