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.

Testing React Apps with Jest and React Testing Library_468 x 60 copy 3.png

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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

## Checking the length of the array

The project for this lesson contains a function called `searchPeople`, which returns matched people objects in an array for some criteria. A test has been partially implemented that checks whether the correct array is returned when a first name is passed as the criteria.

A copy of the starter project is in the code widget below:

# Checking the length of the array

The project for this lesson contains a function called `searchPeople`, which returns matched people objects in an array for some criteria. A test has been partially implemented that checks whether the correct array is returned when a first name is passed as the criteria.

A copy of the starter project is in the code widget below:

Learn various approaches for checking an array result in a test in this lesson.

Checking Arrays

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

Checking Arrays

Checking the length of the array