Serhiy Storchaka added the comment:

Perhaps it will be even better to extract loop body as a local function and 
then call it with different arguments.

    def check(dup):
        self.assertTrue(dup is not od)
        self.assertEqual(dup, od)
        ...
    check(od.copy())
    check(copy.copy(od))
    ...

In this case we will see a tested case right in the traceback.

----------
nosy: +ezio.melotti, michael.foord, pitrou, serhiy.storchaka

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue18106>
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