':py:obj:`X509Type.gmtime_adj_notBefore` changes the not-before timestamp to be
the current time plus the number of seconds passed in.'

def test_gmtime_adj_notBefore(self):

    cert = load_certificate(FILETYPE_PEM, self.pemData)
    now = (datetime.utcnow() + timedelta(seconds=100))
    cert.gmtime_adj_notBefore(100)
    self.assertEqual(cert.get_notBefore(), b(now.strftime('%Y%m%d%H%M%SZ')))
