Allow setupTestFrameworkScriptFile to accept an array (or add a new config option that does)

🚀 Feature Proposal

I would like to pass multiple files to be run immediately before each test file is run but after the test framework has been loaded. This would either amount to extending setupTestFrameworkScriptFile to accept an array of files, or a new config option (setupTestFrameworkFiles?) to allow this.

Motivation & Example

I can change this:

// setupTestFrameworkScriptFile.js
import 'jest-dom/extend-expect'
import 'react-testing-library/cleanup-after-each'

Into this:

// jest.config.js
module.exports = {
  // ...
  setupTestFrameworkFiles: [
    'jest-dom/extend-expect',
    'react-testing-library/cleanup-after-each',
  ]
}

Pitch

This would simplify the project because the fact that setupFiles accepts an array and setupTestFrameworkScriptFile only accepts a string is confusing. It would also mean I don’t have to create a file with two lines of code which would be nice. This would also make extending toolkit with a built-in setupTestFrameworkScriptFile with some custom behavior for the project.

[SimenB]

All we need to clearly communicate is that setupFiles run before the test framework is injected, and setupTestFrameworkScriptFiles (or whatever it ends up being named) is run after. I don’t think either name really does that ATM, but it is what it is

[ddruker]

@SimenB Decided to give this a try and just made a PR. Figured we can talk around the code on the PR.