Auto merge of #1366 - daltonamitchell:patch-1, r=locks
Auto merge of #1366 - daltonamitchell:patch-1, r=locks

Update unit-testing-basics.md

Spotted a small typo. Given the sentence context, it looks like there was a missing word.

Also, it feels like the word *subject* should be wrapped with backticks for consistency, since we're referring to a function name, similar to *moduleFor*.

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