Upgrading jest from 25.5.4 to 26.1.0 in React Native gives missing "InitializeCore" error.

[joshuapinter]

🐛 Bug Report

After upgrading jest and babel-jest from 25.5.4 to 26.1.0, I then get the following error message when running my jest tests:

 FAIL  __tests__/Helpers.test.js
  ● Test suite failed to run

    Cannot find module 'InitializeCore' from 'node_modules/react-native/jest/setup.js'

      at Resolver.resolveModule (node_modules/jest-resolve/build/index.js:308:11)
      at Object.<anonymous> (node_modules/react-native/jest/setup.js:3:15)

I'm on react-native version 0.59.10.

To Reproduce

Steps to reproduce the behavior:

1. Upgrade jest and babel-jest from 25.5.4 to 26.0.0.

2. Run jest tests.

Expected behavior

Tests run normally as they did prior to the upgrade.

Link to repl or repo (highly encouraged)

n/a

envinfo

npx envinfo --preset jest

  System:
    OS: macOS 10.15.5
    CPU: (8) x64 Intel(R) Core(TM) i5-1038NG7 CPU @ 2.00GHz
  Binaries:
    Node: 14.4.0 - /usr/local/bin/node
    Yarn: 1.22.4 - /usr/local/bin/yarn
    npm: 6.14.7 - /usr/local/bin/npm
  npmPackages:
    jest: 26.1.0 => 26.1.0 

[SimenB]

The module is required from node_modules/react-native/jest/setup.js:3:15, you should create an issue with react-native - it's not a bug in Jest.

[joshuapinter]

👍 Will do, thanks.

[SimenB]

@joshuapinter I do believe this is due to #8535 (comment) btw - you'll need to update your version of RN

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