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Rags-To-Riches is the tag of choice for entries to the corresponding CR-Game as proposed on meta. Questions tagged with this tag are polished Stack Exchange posts asking for a review.
6
votes
Accepted
Alternate letters to UpperCase
I think both your solution and your testing are fine.
A couple of test cases I would add (but your solution also passes them):
a string starting with BOM, e.g. {"\xef\xbb\xbfhi", "\xef\xbb\xbfHi"}
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