Make the case-insensitive text matching only when TextMatch is a string.

[thchia]

What:
Convert the matched text to lowercase only when TextMatch is a string.

Why:
Converting it to lowercase for all types of TextMatch breaks case sensitive RegExp matching (#21)

const Component = () => <div>HELLO World</div>

// fails to match because we are trying to match
// against 'HELLO World'.toLowerCase()
getByText(/HELLO World/)

How:
In matches.js, only convert the normalizedText to lowercase if TextMatch is a string. I think that should preserve the case-insensitive nature of matching when TextMatch is a string. I have chosen to leave the case when TextMatch is a function as case-sensitive as well, since this situation is supposed to delegate as much control back to the user.

Checklist:

• Documentation N/A
• Tests
• Ready to be merged
• Added myself to contributors table

[kentcdodds]

Ah yes! Thank you for catching this!

[kentcdodds]

🎉 This PR is included in version 1.7.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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