Best JavaScript code snippet using jest
timerMocks.test.js
Source:timerMocks.test.js
...19// jest.runAllTimers();20// expect(callback).toBeCalled();21// expect(callback).toHaveBeenCalledTimes(1);22// });23// function infiniteTimerGame(callback) {24// console.log('Ready....go!');25// setTimeout(() => {26// console.log("Time's up! 10 seconds before the next game starts...");27// callback && callback();28// // Schedule the next game in 10 seconds29// setTimeout(() => {30// infiniteTimerGame(callback);31// }, 10000);32// }, 1000);33// }34// jest.useFakeTimers();35// describe('infiniteTimerGame', () => {36// test('schedules a 10-second timer after 1 second', () => {37// const callback = jest.fn();38// infiniteTimerGame(callback);39// expect(setTimeout).toHaveBeenCalledTimes(1);40// expect(setTimeout).toHaveBeenLastCalledWith(expect.any(Function), 1000);41// jest.runOnlyPendingTimers();42// expect(callback).toBeCalled();43// expect(setTimeout).toHaveBeenCalledTimes(2);44// expect(setTimeout).toHaveBeenLastCalledWith(expect.any(Function), 10000);45// });46// });47// it('calls the callback after 1 second via advanceTimersByTime', () => {48// const callback = jest.fn();49// timerGame(callback);50// expect(callback).not.toBeCalled();51// jest.advanceTimersByTime(1000);52// expect(callback).toBeCalled();...
timerGame.test.js
Source:timerGame.test.js
...3describe('infiniteTimerGame', () => {4 test('schedules a 10-second timer after 1 second', () => {5 // const infiniteTimerGame = require('../infiniteTimerGame');6 const callback = jest.fn();7 infiniteTimerGame(callback);8 // At this point in time, there should have been a single call to9 // setTimeout to schedule the end of the game in 1 second.10 expect(setTimeout).toHaveBeenCalledTimes(1);11 expect(setTimeout).toHaveBeenLastCalledWith(expect.any(Function), 1000);12 // Fast forward and exhaust only currently pending timers13 // (but not any new timers that get created during that process)14 jest.runOnlyPendingTimers();15 // At this point, our 1-second timer should have fired it's callback16 expect(callback).toBeCalled();17 // And it should have created a new timer to start the game over in18 // 10 seconds19 expect(setTimeout).toHaveBeenCalledTimes(2);20 expect(setTimeout).toHaveBeenLastCalledWith(expect.any(Function), 10000);21 });...
infiniteTimerGame-test.js
Source:infiniteTimerGame-test.js
...4describe('infiniteTimerGame', () => {5 it('schedules a 10-second timer after 1 second', () => {6 const infiniteTimerGame = require('../infiniteTimerGame');7 const callback = jest.fn();8 infiniteTimerGame(callback);9 // At this point in time, there should have been a single call to10 // setTimeout to schedule the end of the game in 1 second.11 expect(setTimeout.mock.calls.length).toBe(1);12 expect(setTimeout.mock.calls[0][1]).toBe(1000);13 // Fast forward and exhaust only currently pending timers14 // (but not any new timers that get created during that process)15 jest.runOnlyPendingTimers();16 // At this point, our 1-second timer should have fired it's callback17 expect(callback).toBeCalled();18 // And it should have created a new timer to start the game over in19 // 10 seconds20 expect(setTimeout.mock.calls.length).toBe(2);21 expect(setTimeout.mock.calls[1][1]).toBe(10000);22 });...
infiniteTimerGame.test.js
Source:infiniteTimerGame.test.js
...6 test("schedules a 10-second timer after 1 second", () => {7 const infiniteTimerGame = require("../../../src/mock/timer/infiniteTimerGame");8 const cb = jest.fn();910 infiniteTimerGame(cb);1112 expect(setTimeout).toHaveBeenCalledTimes(1);13 expect(setTimeout).toHaveBeenLastCalledWith(expect.any(Function), 1000);1415 jest.runOnlyPendingTimers();1617 expect(cb).toBeCalled();1819 expect(setTimeout).toHaveBeenCalledTimes(2);20 expect(setTimeout).toHaveBeenLastCalledWith(expect.any(Function), 10000);21 });
...
timerMocks.js
Source:timerMocks.js
...4 console.log('Times up -- stop!')5 callback && callback()6 }, 1000)7}8// export function infiniteTimerGame(callback) {9// console.log('infiniteTimerGame Ready....go!')10// setTimeout(() => {11// console.log('infiniteTimerGame Times up! 10 seconds before the next game starts...')12// callback && callback()13// // Schedule the next game in 10 seconds14// setTimeout(() => {15// console.log('infiniteTimerGame inner')16// infiniteTimerGame(callback)17// }, 10000)18// }, 1000)...
infiniteTimerGame.js
Source:infiniteTimerGame.js
1// infiniteTimerGame.js2"use strict";3function infiniteTimerGame(callback) {4 console.log("Ready....go!");5 setTimeout(() => {6 console.log("Time's up! 10 seconds before the next game starts...");7 callback && callback();8 // Schedule the next game in 10 seconds9 setTimeout(() => {10 infiniteTimerGame(callback);11 }, 10000);12 }, 1000);13}...
infinite-timer-game.js
Source:infinite-timer-game.js
1function infiniteTimerGame(callback) {2 console.log('Ready....go!');3 setTimeout(() => {4 console.log("Time's up! 10 seconds before the next game starts...");5 callback && callback();6 // Schedule the next game in 10 seconds7 setTimeout(() => {8 infiniteTimerGame(callback);9 }, 10000);10 }, 1000);11}...
LambdaTest’s Jest Testing Tutorial covers step-by-step guides around Jest with code examples to help you be proficient with the Jest framework. The Jest tutorial has chapters to help you learn right from the basics of Jest framework to code-based tutorials around testing react apps with Jest, perform snapshot testing, import ES modules and more.
|<p>it('check_object_of_Car', () => {</p><p>
expect(newCar()).toBeInstanceOf(Car);</p><p>
});</p>|
| :- |
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