Raymond Hettinger <rhettin...@users.sourceforge.net> added the comment:
I concur with David Murray. Usually you care about the specific value changed
to, not whether it changed at all. The changed-by variant is even more
specialized and you're better of using assertEqual since you know what the new
value is supposed to be:
assertEqual(thing.attr, x)
...
assertEqual(thing.attr, x+by)
----------
nosy: +rhettinger
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue10675>
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