Check p*q=n in the tests
diff --git a/tests/hazmat/primitives/test_rsa.py b/tests/hazmat/primitives/test_rsa.py
index c725c5f..87d3973 100644
--- a/tests/hazmat/primitives/test_rsa.py
+++ b/tests/hazmat/primitives/test_rsa.py
@@ -50,6 +50,8 @@
         assert skey.key_size == pkey.key_size
         assert skey.key_size == pkey2.key_size
 
+        assert skey.p * skey.q == skey.modulus
+
     def test_invalid_argument_types(self):
         with pytest.raises(TypeError):
             rsa.RSAPrivateKey(None, None, None, None, None)