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'''Basic unit test functionality.'''

import re
import unittest


class TestCase(unittest.TestCase):
    def _assertRaisesRegexp(self, expected_exception, regex_message, callable, *args):
        try:
            callable(*args)
            self.assertTrue(False, 'No assert raised.')
        except Exception as exception:
            self.assertTrue(issubclass(exception.__class__, expected_exception),
                            'Exception type was unexpected.')
            self.assertTrue(re.match(regex_message, exception.__str__()),
                            'Expected regex "%s"\nGot "%s"' % (regex_message, exception.__str__()))