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L{_ErrorFormatter.formatError} should use L{os.strerror} to format
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L{_ErrorFormatter.formatError} should use L{os.strerror} to format
error messages if it is constructed with only an error tab which does
not contain the error code it is called with.
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L{_ErrorFormatter.formatError} should use C{errorTab} if it is supplied
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L{_ErrorFormatter.formatError} should return the message argument from
the exception L{winError} returns, if L{winError} is supplied.
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L{_ErrorFormatter.fromEnvironment} should create an L{_ErrorFormatter}
instance with attributes populated from available modules.
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Given a known-good errno, make sure that formatMessage gives results
matching either C{socket.errorTab}, C{ctypes.WinError}, or
C{win32api.FormatMessage}.
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