More helpers for testing hooks

[hyochan]

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I'd like to know how to test context-api with react-native-testing-library.
It is supported int react-testing-library as in #296. Also, [useContext] could be covered which was addressed in #283.

I searched for api doc and I am not seeing any use-case for this one.

[thymikee]

No, we don't have that.

[hyochan]

I'd like to request feature for better react-hook support such as useContext, useRef.

P.S. When wrapping component with forwardRef, testingLib = render(component) testingLib won't grab the existing testID by getByTestId.

[thymikee]

If you are interested in testing a custom hook, check out react-hooks-testing-library. That's the current recommendation from the Testing Library