Jest module mocking fails when .babelrc exists

🐛 Bug Report

I’ve got an ES6+ project, using Jest for testing. Due to client-side requirements, I needed to add Babel to the project to compile to ES5. After setting up Babel (and doing nothing else), my project’s tests no longer pass. I have attempted to add a "transform": {} section to the Jest config in my package.json, but this doesn’t solve the issue either.

To Reproduce

Steps to reproduce the behavior:

1. Clone https://github.com/AKPWebDesign/JestIssue
2. yarn - Install dependencies
3. yarn test - Fails
4. rm .babelrc - Remove Babel config
5. yarn test - Passes

Expected behavior

I expected this bare-bones Babel config to have no effect on Jest, and for Jest to continue working as it did previously.

Run npx envinfo --preset jest

npx: installed 1 in 2.03s

  System:
    OS: macOS High Sierra 10.13.4
    CPU: x64 Intel(R) Core(TM) i7-7920HQ CPU @ 3.10GHz
  Binaries:
    Node: 8.11.2 - /usr/local/bin/node
    Yarn: 1.7.0 - /usr/local/bin/yarn
    npm: 5.6.0 - /usr/local/bin/npm
  npmPackages:
    jest: ^23.1.0 => 23.1.0

[SimenB]

The issue is that you set babel to ignore the test directory, and your test relies on mock hoisting (which is done using babel).

You can move your jest.mock call above require, or remove ignore from .babelrc

[github-actions[bot]]

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