Learning Redux

Setup and teardown

As mentioned earlier, there are cases where we need to clean up the environment after our tests run (teardown). In other cases, we might want to run some code before the tests run, like creating sample data (setup).

There are two ways to do setup and teardown in Jest:

• You can run code before/after each test, via beforeEach and afterEach
• Or you can run code before/after all tests, via beforeAll and afterAll

beforeEach, afterEach, beforeAll, and afterAll also support asynchronous code, in the same way that tests support it. You can use the done argument, or return a promise.