[issue13450] add assertions to implement the intent in ''.format_map test

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:

I don't think the existing tests have any value. I might leave one of them, but I think I'll just use your new tests instead.

akira: I'd like to add your name to the Misc/ACKS file, if it's not already there. What's your full name?

Thanks for the bug report and patch.

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