Gain insights into writing automated tests for React apps with Jest and React Testing Library. Learn about simulating user interactions and testing asynchronous parts to enhance app reliability.

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Jest - lesson 2

Jest with run command

Jest verbose

Jest coverage

Jest snapshot update

Jest react

Jest react-npm start

Jest react-copy

Jest react-C4

Jest react-C6

Jest react start c6

Jest - lesson 2-copy

Jest sandbox

Jest coverage-copy

Jest react-C4-start

Jest react-C4-start-5000

Jest react-npm start-5000

Jest react start c6-5000

Jest react-C8

The skills acquired from this course will allow you to write automated tests on your React app using Jest and React Testing Library, which are the de-facto testing tools for React. These tests will allow you to ship new versions of your app with confidence. The tests will also allow you to increase your release frequency, allowing you to get features to your customers quicker.

You will learn how to write robust tests that are resilient to breaking when code is improved and refactored, reducing maintenance costs.
The course will teach you how to simulate a user interacting with the app. Beyond that, it will also teach you how to robustly test asynchronous parts of the app.

Regular quizzes and exercises will reinforce knowledge throughout the course.

Testing React Apps with Jest and React Testing Library

The starter project contains an app that allows a user to view and add notes.

The project already contains some tests. In this exercise, you’ll add additional tests to the following components and custom hooks:

- `HomePage`

- `NewNotePage`

- `useNoteField`

- `useGetNotes`

- `useSaveNote`

module.exports = {
  presets: [
    ["@babel/preset-env", { targets: { node: "current" } }],
    ["@babel/preset-react", { runtime: "automatic" }],
  ],
};


import "@testing-library/jest-dom";
import "whatwg-fetch";

React

Dart

GoJS React

Typescript React

Vue.js

# `HomePage` tests

The tests on the `HomePage` component should verify the following:

- The correct page title is rendered.

- A loading message is rendered when data is being fetched.

- The notes table has the correct content after data has been fetched.

- The “New Notes” page should render when the **“Add”** button is clicked.

Create a file called `HomePage.test.js` adjacent to `HomePage.js` and implement these tests. Make sure the tests all pass.

This exercise will allow you to put into practice what you have learned so far in this course.

Introduction

Getting Started with Jest

Using Matchers

Getting Started with React Testing Library

React Testing Library Queries

Firing Events

Mocking

Testing Different Types of Components

Appendix

Exercise: Types of Components

`HomePage` tests

Exercise: Types of Components

HomePage tests

`HomePage` tests