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# coding: utf-8
from __future__ import unicode_literals, division, absolute_import, print_function
import re
import sys
from contextlib import contextmanager
if sys.version_info < (3,):
str_cls = unicode # noqa
else:
str_cls = str
@contextmanager
def assert_exception(test_case, expected_class, expected_msg):
"""
Look for a specific exception type and message, allowing the exception
to be raised if it doesn't match
"""
expected_re = re.compile(expected_msg)
try:
yield
except Exception as e:
should_raise = True
if isinstance(e, expected_class):
test_case.assertIsInstance(e, expected_class)
msg = str_cls(e)
if expected_re.search(msg):
test_case.assertRegex(msg, expected_re)
should_raise = False
if should_raise:
raise
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