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

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

When someone puts thought into a report or patch, they deserve to be in Misc/ACKS.  Just noticing one typo doesn’t qualify, but pretty much anything above does.  :)

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nosy: +eric.araujo
versions:  -Python 3.4

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