What is a testing library and how do I use it?

What is a testing library and how do I use it?

A testing library is a collection of tools and functions that help you write and run tests for your code. They simplify the process of verifying that your code behaves as expected.

Can you give me an example of a popular testing library?

Sure! One popular testing library is Jest, which is widely used in JavaScript applications for unit testing.

How do I set up Jest in my project?

To set up Jest, you can install it via npm with the command npm install --save-dev jest. Then, you can add a test script in your package.json file.

What are some best practices for writing tests?

Some best practices include writing clear and descriptive test cases, keeping tests isolated, and ensuring they run quickly.