Add additional test cases

[djpugh]

Add additional test cases

fastapi_aad_auth/tests/unit/test_errors.py

Lines 5 to 10 in 9c81c78

	# TODO: Add additional test cases
	class ConfigurationErrorTestCase(unittest.TestCase):
	def test_configuration_error(self):
	with self.assertRaises(ConfigurationError):

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This comment was generated by todo based on a TODO comment in 9c81c78 in #5. cc @djpugh.

Originally posted by @todo in #5 (comment)