fix: check for undefined/null children

[Esemesek]

Summary

Check for undefined/null values, in getByText nodes.

Fixes #135

Test plan

Passing tests on repro repository https://github.com/wKovacs64/rntl-161-repro.

Have no idea how to create a unit test, to test this behavior.

cc @thymikee @wKovacs64

[wKovacs64]

This works in my much larger "real" app, too! 🎉

---

Out of curiosity, how were you testing this branch in the repro repo? yarn link didn't work for me for some reason, I had to manually copy the build output.

yarn link results

First test:

Currently the only supported library to search by text is "react-native".

Cannot find module 'warnOnce' from 'react-native-implementation.js'

Second test:

No instances found

[thymikee]

Did you run yarn so that the files are updated in the build/ dir?

[wKovacs64]

I did indeed.

[Esemesek]

@wKovacs64

• Install deps
• Go to node_modules/react-native-testing-library
• Change "main" in package.json to point to src/index.js instead of build/index.js
• Edit files in node_modules/react-native-testing-library/src and hack around :P

[wKovacs64]

@Esemesek Thanks. 🙂

[steobrien]

Thanks a lot for this fix! Looking forward to seeing it in a release.

[jakemmarsh]

Any updates on getting this published?

[ryanjwessel]

Not sure if this has been integrated with a release yet, but I am running into this error on version 7.0.1 today.