@types/sinonjs__fake-timers

Controlling setTimeout

This feature allows you to control the behavior of setTimeout, making it easier to test code that relies on delayed execution.

const sinon = require('sinon');
const clock = sinon.useFakeTimers();

setTimeout(() => {
  console.log('This will be printed after 2 seconds');
}, 2000);

clock.tick(2000); // Fast-forwards time by 2000ms

Controlling setInterval

This feature allows you to control the behavior of setInterval, making it easier to test code that relies on repeated execution.

const sinon = require('sinon');
const clock = sinon.useFakeTimers();

let count = 0;
const intervalId = setInterval(() => {
  count += 1;
  console.log('Interval count:', count);
}, 1000);

clock.tick(3000); // Fast-forwards time by 3000ms
clearInterval(intervalId);

Mocking Date

This feature allows you to mock the Date object, making it easier to test code that relies on the current date and time.

const sinon = require('sinon');
const clock = sinon.useFakeTimers(new Date(2020, 1, 1));

console.log(new Date()); // Outputs: 2020-02-01T00:00:00.000Z

clock.tick(86400000); // Fast-forwards time by 1 day
console.log(new Date()); // Outputs: 2020-02-02T00:00:00.000Z