What is Jest setup and teardown?

Can you explain what setup and teardown mean in Jest?

Sure! In Jest, setup refers to the code that runs before your tests, while teardown runs after the tests.

Why is it important to have setup and teardown in tests?

It's important because they help ensure that each test runs in a clean environment, preventing side effects.

Can you give me an example of how to implement setup and teardown in Jest?

Absolutely! You can use beforeEach for setup and afterEach for teardown. Here's a simple example:

beforeEach(() => {
  // setup code
});

afterEach(() => {
  // teardown code
});

What happens if I don't use setup and teardown?

If you don't use them, tests might interfere with each other, leading to flaky tests and unreliable results.