diff --git a/test/test_crypto.py b/test/test_crypto.py
index 4c66c62..e853094 100644
--- a/test/test_crypto.py
+++ b/test/test_crypto.py
@@ -265,6 +265,19 @@
 
 
 
+    def test_hash(self):
+        """
+        L{X509Name.hash} returns an integer hash based on the value of the
+        name.
+        """
+        a = self._x509name(CN="foo")
+        b = self._x509name(CN="foo")
+        self.assertEqual(a.hash(), b.hash())
+        a.CN = "bar"
+        self.assertNotEqual(a.hash(), b.hash())
+
+
+
 class _PKeyInteractionTestsMixin:
     """
     Tests which involve another thing and a PKey.