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Enable src/node_modules

Closed Administrator requested to merge github/fork/modernserf/jest-config-src-node_modules into master

Created by: modernserf

[HOLD] not particularly useful without changes in Jest

Partially fixes https://github.com/facebookincubator/create-react-app/issues/607

These are the necessary changes in react-scripts to allow code to live in src/node_modules and allow Jest to run tests in that directory.

However, Jest cannot find these tests on its own -- all files in any node_modules are filtered out even before the file matching patterns are applied. See issue https://github.com/facebook/jest/issues/2145.

Without changes in Jest, there are a few workarounds:

Import the package tests into a file that jest can find

// src/node_modules/Foo/Foo.test.js
it("does a thing", ()=> {
  expect(true).toBe(true)
})
// src/index.js
import "Foo/Foo.test.js"

Whitelist the directories you want to test with the haste.providesModuleNodeModules option

This is not the intended use for this option, but its used as a whitelist for the haste module resolution, and therefore Jest can find tests in these directories.

TODO

  • get related issue in facebook/jest resolved
  • figure out how to test this
  • rebase, clean up etc