'Missing ECC does not break the constructor and sets C{_ecCurve} to
L{None}.'

def test_ecDoesNotBreakConstructor(self):

    def raiser(self):
        raise NotImplementedError
    self.patch(sslverify._OpenSSLECCurve, '_getBinding', raiser)
    opts = sslverify.OpenSSLCertificateOptions(privateKey=self.sKey, certificate=self.sCert)
    self.assertIsNone(opts._ecCurve)
