'Test that all the supportedCiphers are valid.'

def test_ciphersAreValid(self):

    ciphers = transport.SSHCiphers('A', 'B', 'C', 'D')
    iv = key = ('\x00' * 16)
    for cipName in self.proto.supportedCiphers:
        self.assertTrue(ciphers._getCipher(cipName, iv, key))
