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Javascript 2022-03-27 14:35:09
jest mock restore
test("mockFn.mockReset", () => { const mockFn = jest.fn().mockImplementation(() => 43); const MockClass = jest.fn(); new MockClass(); expect(mockFn()).toBe(43); expect(mockFn.mock.calls).toHaveLength(1); expect(MockClass.mock... Add solution -
Javascript 2022-02-11 04:35:13
mock a function jest react
import React from 'react'; import { render } from '@testing-library/react'; import '@testing-library/jest-dom/extend-expect' import App from './App'; import { randomNameGenerator } from "./utils"; jest.mock('./utils.js', () => ({ randomN... Add solution -
Javascript 2022-01-26 07:56:43
jest mock instance
describe("mockImplementation", () => { test("function", () => { const mockFn1 = jest.fn().mockImplementation(() => 42); const mockFn2 = jest.fn(() => 42); expect(mockFn1()).toBe(42); expect(mockFn2()).toB... Add solution -
Other 2021-11-09 19:32:13
how to spy on console.error jest
beforeAll(() => { // Create a spy on console (console.log in this case) and provide some mocked implementation // In mocking global objects it's usually better than simple `jest.fn()` // because you can `unmock` it in clean way doing `mockR... Add solution -
Javascript 2021-11-07 15:51:18
mock sqs.sendMessage node js
import sendMessage from './'; import AWS from 'aws-sdk'; jest.mock('aws-sdk', () => { const SQSMocked = { sendMessage: jest.fn().mockReturnThis(), promise: jest.fn() }; return { SQS: jest.fn(() => SQSMocked) }; }); const sqs = ... Add solution -
Other 2021-11-05 09:04:22
simple jest test cases for array of objects
import pizzas from '../data'; // very basic test to notify the user if our pizza data has changed test('the pizza data is correct', () => { expect(pizzas).toMatchSnapshot(); expect(pizzas).toHaveLength(4); expect(pizzas.map(pizza => pizza.nam... Add solution -
Other 2021-10-27 21:43:10
how to check callback is fired rtl
it('calls "onClick" prop on button click', () => { // Render new instance in every test to prevent leaking state const onClick = jest.fn(); const { getByText } = render(<Button onClick={onClick} />); fireEvent.click(getByText(/... Add solution -
Other 2021-10-20 08:24:11
mock click function functinal component enzyme
import React from 'react'; import Profile from '.'; import { shallow } from 'enzyme'; describe('62202833', () => { it('should pass', () => { const wrapper = shallow(<Profile></Profile>); const mEvent = { preventDefault: jest.f... Add solution