What are the best practices for using setupFiles in Jest?

What are the best practices for using setupFiles in Jest?

Using setupFiles in Jest allows you to run some code before your tests. Best practices include keeping setup files minimal, using them for global configurations, and ensuring they don't contain test logic.

Can you give an example of what to include in a setupFile?

Sure! A common use case is to set up a testing environment, like configuring Enzyme for React tests or setting global variables.

How do I specify multiple setupFiles in my Jest configuration?

You can specify multiple setupFiles in your Jest configuration by using an array. For example: setupFiles: ['<rootDir>/setupTests.js', '<rootDir>/anotherSetup.js'].

Is there a difference between setupFiles and setupFilesAfterEnv?

Yes, setupFiles runs before the test framework is installed, while setupFilesAfterEnv runs after the test framework is set up, making it suitable for configuring testing libraries.