Running a global test setup before each test in Jest

Question

I'm trying to have a test setup function executed before each single test in my Jest test suite. I know that I can use beforeEach to accomplish this within a single test file, but I want to do it globally for all my test files without having to explicitly modify each single file.

I looked into the jest configuration file, and noticed a couple of configs that thought could have worked: globalSetup and setupFiles, but they seem to be run only once (at the very beginning of the test run). Like I said, I need it to be run before "each" it block in my test files.

Is this possible?

Answer 1

You could use setupFilesAfterEnv (which replaces setupTestFrameworkScriptFile, deprecated from jest version 24.x) which will run before each test

// package.json {   // ...   "jest": {     "setupFilesAfterEnv": ["<rootDir>/setupTests.js"]   } } 

And in setupTests.js, you can directly write:

global.beforeEach(() => {   ... });  global.afterEach(() => {    ... });