For a react-native app using react-router, jest and react-test-renderer, the <Link> component doesn't seem to be testable. The react-router documentation makes no mention of having to do anything special (mocking?) for react-native and my tests only blow up when the react-router's <Link> component is included in the tree being rendered. Other components (e.g. <Text>, <Router>) do not have this problem.
This basic react-native project reproduces the exploding test. The app otherwise builds and behaves as expected inside a phone.
Do I have a configuration problem? Is it undocumented, or did I just overlook it? Or should I give up and switch to using enzyme? Would that even help?
Here's the salient test output:
TypeError: Cannot read property 'default' of undefined
at new Link (minimal-bug-repro/node_modules/react-router-native/Link.js:5:379)
at constructClassInstance (minimal-bug-repro/node_modules/react-test-renderer/cjs/react-test-renderer.development.js:3438:22)
at updateClassComponent (minimal-bug-repro/node_modules/react-test-renderer/cjs/react-test-renderer.development.js:6764:9)
at beginWork (minimal-bug-repro/node_modules/react-test-renderer/cjs/react-test-renderer.development.js:7721:20)
at performUnitOfWork (minimal-bug-repro/node_modules/react-test-renderer/cjs/react-test-renderer.development.js:11392:16)
at workLoop (minimal-bug-repro/node_modules/react-test-renderer/cjs/react-test-renderer.development.js:11424:28)
at renderRoot (minimal-bug-repro/node_modules/react-test-renderer/cjs/react-test-renderer.development.js:11507:11)
at performWorkOnRoot (minimal-bug-repro/node_modules/react-test-renderer/cjs/react-test-renderer.development.js:12395:11)
at performWork (minimal-bug-repro/node_modules/react-test-renderer/cjs/react-test-renderer.development.js:12307:11)
at performSyncWork (minimal-bug-repro/node_modules/react-test-renderer/cjs/react-test-renderer.development.js:12281:7) { componentStack:
Upgrade jest to >= 24.0.0, remove the transform: section of the jest.config.js, and switch to a plain preset: 'react-native'.