Prevent crashing from UnicodeDecodeError #988
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On Python 2, `sys.stdout` and `print` can normally handle any combination of `str` and `unicode` objects. However, `StringIO.StringIO` can only safely handle one or the other. If the program writes both a `unicode` string, and a non-ASCII `str` string, then the `getvalue()` method will fail with `UnicodeDecodeError` [1]. In nose, that causes the script to suddenly abort, with the cryptic `UnicodeDecodeError`. This fix catches `UnicodeError` when trying to get the captured output, and will replace the captured output with a warning message. Fixes nose-devs#816 [1] <https://github.com/python/cpython/blob/2.7/Lib/StringIO.py#L258>
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On Python 2,
sys.stdoutandprintcan normally handle any combination ofstrandunicodeobjects. However,StringIO.StringIOcan only safely handle one or the other. If the program writes both aunicodestring, and a non-ASCIIstrstring, then thegetvalue()method will fail withUnicodeDecodeError[1].In nose, that causes the script to suddenly abort, with the cryptic
UnicodeDecodeError.This fix catches
UnicodeErrorwhen trying to get the captured output, and will replace the captured output with a warning message.Fixes #816
[1] https://github.com/python/cpython/blob/2.7/Lib/StringIO.py#L258