def test_credentialsWithBadKey(self):
        self.credentials.blob = b''
        self.failureResultOf(self.checker.requestAvatarId(self.credentials),
                             keys.BadKeyError)
Calling L{checkers.SSHPublicKeyChecker.requestAvatarId} with
dataset/ETHPy150Open twisted/twisted/twisted/conch/test/test_checkers.py/SSHPublicKeyCheckerTests.test_credentialsWithBadKey