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Updated debounce test spec to use jest timers

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This commit is contained in:
Andrew Bastin
2020-08-26 12:14:47 -04:00
parent 3cd2a2a0f9
commit 4b87684611
1 changed files with 6 additions and 6 deletions
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12
helpers/utils/__tests__/debounce.spec.js
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@@ -1,9 +1,5 @@
import debounce from "../debounce" import debounce from "../debounce"
function sleep(millis) {
return new Promise((resolve) => setTimeout(resolve, millis))
}
describe("debounce", () => { describe("debounce", () => {
test("doesn't call function right after calling", () => { test("doesn't call function right after calling", () => {
const fn = jest.fn() const fn = jest.fn()
@@ -17,12 +13,15 @@ describe("debounce", () => {
test("calls the function after the given timeout", async () => { test("calls the function after the given timeout", async () => {
const fn = jest.fn() const fn = jest.fn()
jest.useFakeTimers()
const debFunc = debounce(fn, 100) const debFunc = debounce(fn, 100)
debFunc() debFunc()
await sleep(1000) jest.runAllTimers()
expect(fn).toHaveBeenCalled() expect(fn).toHaveBeenCalled()
expect(setTimeout).toHaveBeenCalledWith(expect.any(Function), 100)
}) })
test("calls the function only one time within the timeframe", async () => { test("calls the function only one time within the timeframe", async () => {
@@ -31,7 +30,8 @@ describe("debounce", () => {
const debFunc = debounce(fn, 1000) const debFunc = debounce(fn, 1000)
for (let i = 0; i < 100; i++) debFunc() for (let i = 0; i < 100; i++) debFunc()
await sleep(2000)
jest.runAllTimers()
expect(fn).toHaveBeenCalledTimes(1) expect(fn).toHaveBeenCalledTimes(1)
}) })