-
Notifications
You must be signed in to change notification settings - Fork 14
/
useInterval.test.ts
63 lines (56 loc) · 1.68 KB
/
useInterval.test.ts
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
53
54
55
56
57
58
59
60
61
62
63
import { useInterval } from '../src/useInterval'
import invokeHook from './util/invokeHook'
let callback: Function | undefined
beforeEach(() => {
callback = jest.fn()
jest.useFakeTimers()
})
afterEach(() => {
jest.clearAllTimers()
jest.useRealTimers()
})
test('should init interval with delay = 500', () => {
invokeHook(() => {
useInterval(callback!, 500)
})
expect(setInterval).toHaveBeenCalledTimes(1)
expect(setInterval).toHaveBeenCalledWith(expect.any(Function), 500)
jest.advanceTimersByTime(500)
expect(callback).toHaveBeenCalled()
})
test('should clearInterval when unmounted', () => {
const wrapper = invokeHook(() => {
useInterval(callback!, 500)
})
wrapper.unmount()
expect(clearInterval).toHaveBeenCalledTimes(1)
expect(clearInterval).toHaveBeenCalledWith(expect.any(Number))
jest.advanceTimersByTime(500)
expect(callback).not.toBeCalled()
})
test('interval should be cleared after invoking clear', () => {
let clear: () => void
invokeHook(() => {
[clear] = useInterval(callback!, 500)
})
clear!()
expect(clearInterval).toHaveBeenCalledTimes(1)
expect(clearInterval).toHaveBeenCalledWith(expect.any(Number))
})
test('interval will be start after invoking start', () => {
let clear: () => void
let start: () => void
invokeHook(() => {
const res = useInterval(callback!, 500)
clear = res[0]
start = res[1]
})
clear!()
expect(clearInterval).toHaveBeenCalledTimes(1)
expect(clearInterval).toHaveBeenCalledWith(expect.any(Number))
start!()
expect(setInterval).toHaveBeenCalled()
expect(setInterval).toHaveBeenCalledWith(expect.any(Function), 500)
jest.advanceTimersByTime(500)
expect(callback).toHaveBeenCalled()
})