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# coding: utf-8
from __future__ import unicode_literals, division, absolute_import, print_function
import sys
import unittest
import re
_non_local = {'patched': False}
def patch():
if not sys.version_info < (2, 7):
return
if _non_local['patched']:
return
unittest.TestCase.assertIsInstance = _assert_is_instance
unittest.TestCase.assertRaises = _assert_raises
unittest.TestCase.assertRaisesRegexp = _assert_raises_regexp
_non_local['patched'] = True
def _assert_is_instance(self, obj, cls, msg=None):
"""Same as self.assertTrue(isinstance(obj, cls)), with a nicer
default message."""
if not isinstance(obj, cls):
if not msg:
msg = '%s is not an instance of %r' % (obj, cls)
self.fail(msg)
def _assert_raises(self, expected_exception, callableObj=None, *args, **kwargs): # noqa
context = _AssertRaisesContext(expected_exception, self)
if callableObj is None:
return context
with context:
callableObj(*args, **kwargs)
def _assert_raises_regexp(self, expected_exception, expected_regexp, callable_obj=None, *args, **kwargs):
if expected_regexp is not None:
expected_regexp = re.compile(expected_regexp)
context = _AssertRaisesContext(expected_exception, self, expected_regexp)
if callable_obj is None:
return context
with context:
callable_obj(*args, **kwargs)
class _AssertRaisesContext(object):
"""A context manager used to implement TestCase.assertRaises* methods."""
def __init__(self, expected, test_case, expected_regexp=None):
self.expected = expected
self.failureException = test_case.failureException
self.expected_regexp = expected_regexp
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, tb):
if exc_type is None:
try:
exc_name = self.expected.__name__
except AttributeError:
exc_name = str(self.expected)
raise self.failureException(
"{0} not raised".format(exc_name))
if not issubclass(exc_type, self.expected):
# let unexpected exceptions pass through
return False
self.exception = exc_value # store for later retrieval
if self.expected_regexp is None:
return True
expected_regexp = self.expected_regexp
if not expected_regexp.search(str(exc_value)):
raise self.failureException(
'"%s" does not match "%s"' %
(expected_regexp.pattern, str(exc_value))
)
return True
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