Jest integration broken?

[jojenki]

I created and started building my Expo app about a month and a half ago. I’m at the stage where I need to create tests, so I was following:

Testing with Jest - Expo Documentation

Installing jest-expo works, but installing react-test-renderer breaks due to dependency issues:

npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! While resolving: undefined@undefined
npm ERR! Found: react@16.13.1
npm ERR! node_modules/react
npm ERR!   react@"16.13.1" from the root project
npm ERR!   peer react@">=16.0.0" from @testing-library/react-native@7.1.0
npm ERR!   node_modules/@testing-library/react-native
npm ERR!     dev @testing-library/react-native@"*" from the root project
npm ERR!   1 more (react-native)
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer react@"17.0.1" from react-test-renderer@17.0.1
npm ERR! node_modules/react-test-renderer
npm ERR!   peer react-test-renderer@">=16.0.0" from @testing-library/react-native@7.1.0
npm ERR!   node_modules/@testing-library/react-native
npm ERR!     dev @testing-library/react-native@"*" from the root project
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.

I performed expo upgrade, which claimed I was already at the latest version but performed an upgrade (and downgrade in some cases) of my packages just to be sure, but the issue persists.

Of course, I can manually change package versions in my package.json, but that seems dubious. Thoughts?

[jaquino]

Here’s the answer to your problem.

For better context, you should read the whole thread though really not just that one comment.