[issue25651] Confusing output for TestCase.subTest(0)

[Nan Wu]

Nan Wu added the comment:

Made it check against None explicitly. My concern is if [] is passed in, if will show [[]]. But this case should be rare.

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keywords: +patch
nosy: +Nan Wu
Added file: http://bugs.python.org/file41115/subtest_msg_check_against_None.patch

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