Allow testMatch to take a string value

[spenserblack]

Summary

Inspired by a mistake I made while modifying the config. I was surprised that testMatch only took an array of strings, and not a string value. This struck me as a bit unusual, especially since a similar option, testRegex, takes string | string[].

Test plan

Wrote a test case for the normalize function to assert that "some string" gets transformed to ["some string"].

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: spenserblack / name: Spenser Black (33893fd, 1a45375, 13d5d3b, 11b7d4b)

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commit: 13d5d3b

[cpojer]

That's a good fix, thank you!