[Python-Dev] unittest assertRaisesRegex bug? (original) (raw)

Ethan Furman ethan at stoneleaf.us
Wed Mar 19 22:37:42 CET 2014

Here's the code in question:

     class PsuedoFloat:
         def __init__(self, value):
             self.value = float(value)
         def __int__(self):
             return int(self.value)

     pi = PsuedoFloat(3.1415)

     self.assertRaisesRegex(TypeError, '%x format: an integer is required, not PsuedoFloat', '%x'.__mod__, pi),

Here's the exception:

====================================================================== ERROR: test_formatting (test.test_unicode.UnicodeTest)

TypeError: 'PsuedoFloat' object is not callable

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File "/home/ethan/source/python/issue19995/Lib/test/test_unicode.py", line 1156, in test_formatting self.assertRaisesRegex(TypeError, '%c'.mod, pi), File "/home/ethan/source/python/issue19995/Lib/unittest/case.py", line 1235, in assertRaisesRegex return context.handle('assertRaisesRegex', callable_obj, args, kwargs) File "/home/ethan/source/python/issue19995/Lib/unittest/case.py", line 161, in handle callable_obj(*args, **kwargs) File "/home/ethan/source/python/issue19995/Lib/unittest/case.py", line 190, in exit if not expected_regex.search(str(exc_value)): AttributeError: 'method-wrapper' object has no attribute 'search'

At worst, I was expecting a difference in the TypeError exception message; I have no idea why pi is being called. From the docs:

---- http://docs.python.org/3/library/unittest.html#unittest.TestCase.assertRaisesRegex ---- assertRaisesRegex(exception, regex, callable, *args, **kwds)

 Like assertRaises() but also tests that regex matches on the string representation
 of the raised exception. regex may be a regular expression object or a string
 containing a regular expression suitable for use by re.search(). Examples:

 self.assertRaisesRegex(ValueError, "invalid literal for.*XYZ'$", int, 'XYZ')

Am I correct in thinking this is a bug?

-- Ethan

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