Babel Plugin Display Name Injections Not Used in Coverage Runs

[louisscruz]

🐛 Bug Report

When running --coverage, Babel transforms on components' displayNames aren't found, leading to failing tests.

I'm using this Babel plugin to change all display names of components created with react-fela: https://github.com/louisscruz/babel-plugin-transform-react-fela-display-name.

Example test failure:

    Method “simulate” is only meant to be run on a single node. 0 found instead.

       98 |       expect(wrapper).toBeOnStep('ReceivingCallStep');
       99 |
    > 100 |       wrapper.find('AcceptCallButton').simulate('click');

My understanding is that Babel Jest should be making the transformation (before being instrumented?) specified in my configuration:

const babelJest = require('babel-jest');

module.exports = babelJest.createTransformer({
  plugins: [
    require.resolve('babel-plugin-transform-class-properties'),
    require.resolve('babel-plugin-transform-decorators-legacy'),
    require.resolve('babel-plugin-inline-react-svg'),
    require.resolve('babel-plugin-import-remove-resource-query'),
    require.resolve('babel-plugin-transform-react-fela-display-name'),
  ],
  presets: [require.resolve('babel-preset-react-app')],
  babelrc: false,
});

And in my jestConfig.json:

...
  "transform": {
    ...,
    "^.+\\.(js|jsx)$": "<rootDir>/config/jest/transforms/babelTransform.js",
    ...
  }
...

But that doesn't seem to be the case.

To Reproduce

Steps to reproduce the behavior:

• Add babel plugin that alters component displayName to your babel-jest configuration.
• Have code that triggers a displayName injection to your code.
• Write a test that relies on that displayName.
• Run jest --coverage and watch your test fail.

Expected behavior

The test runs during coverage collection should use the displayName set by the Babel plugin.

Run npx envinfo --preset jest

Paste the results here:

  System:
    OS: macOS Sierra 10.12.6
    CPU: x64 Intel(R) Core(TM) i7-6820HQ CPU @ 2.70GHz
  Binaries:
    Node: 8.9.3 - ~/.nvm/versions/node/v8.9.3/bin/node
    Yarn: 1.5.1 - /usr/local/bin/yarn
    npm: 5.5.1 - ~/.nvm/versions/node/v8.9.3/bin/npm
  npmPackages:
    jest: 23.0.0-beta.2 => 23.0.0-beta.2

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