l.append(X509(self.ca_cert))
l.append(X509(self.digicert_cert))
stack=StackOfX509(certs=l)
self.assertEqual(len(stack),3)
self.assertTrue(isinstance(stack[1],X509))
l.append(X509(self.ca_cert))
l.append(X509(self.digicert_cert))
stack=StackOfX509(certs=l)
self.assertEqual(len(stack),3)
self.assertTrue(isinstance(stack[1],X509))