-
-
Notifications
You must be signed in to change notification settings - Fork 6.4k
/
timer_game.test.js
52 lines (38 loc) · 1.42 KB
/
timer_game.test.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
// Copyright 2004-present Facebook. All Rights Reserved.
'use strict';
jest.useFakeTimers();
describe('timerGame', () => {
beforeEach(() => {
jest.spyOn(global, 'setTimeout');
});
it('waits 1 second before ending the game', () => {
const timerGame = require('../timerGame');
timerGame();
expect(setTimeout).toBeCalledTimes(1);
expect(setTimeout).toBeCalledWith(expect.any(Function), 1000);
});
it('calls the callback after 1 second via runAllTimers', () => {
const timerGame = require('../timerGame');
const callback = jest.fn();
timerGame(callback);
// At this point in time, the callback should not have been called yet
expect(callback).not.toBeCalled();
// Fast-forward until all timers have been executed
jest.runAllTimers();
// Now our callback should have been called!
expect(callback).toBeCalled();
expect(callback).toBeCalledTimes(1);
});
it('calls the callback after 1 second via advanceTimersByTime', () => {
const timerGame = require('../timerGame');
const callback = jest.fn();
timerGame(callback);
// At this point in time, the callback should not have been called yet
expect(callback).not.toBeCalled();
// Fast-forward until all timers have been executed
jest.advanceTimersByTime(1000);
// Now our callback should have been called!
expect(callback).toBeCalled();
expect(callback).toBeCalledTimes(1);
});
});