Setting up unit testing in a React app involves several steps. Here’s a general guide to help you get started:

Step 1: Install the necessary dependencies

You’ll need to install the testing libraries and tools required for unit testing in React. The most common ones are Jest and React Testing Library.

npm install --save-dev jest @testing-library/react

Step 2: Create the test files

Create a folder called __tests__ in your source code directory (usually the same level as the src folder).…

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React Testing Library makes functional testing of React components easier. It provides a virtual DOM where we can render components, provides methods to query the DOM for various elements, interact with those elements and make assertions on them. The objective of this post is to serve as a one-stop reference material for the most commonly used code patterns related to React testing library.…

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Istanbul provides code coverage metrics for automated unit tests. It provides those metrics by instrumenting the JavaScript code. Official documentation on the website provides how to integrate Istanbul with various unit testing frameworks.

But, let’s say we do not have unit tests. And we do manual testing. How much of code coverage does our testing do? For this problem, there is very little official support.…

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