1 files changed, 9 insertions, 4 deletions
diff --git a/tests/hazmat/primitives/test_hmac.py b/tests/hazmat/primitives/test_hmac.py
index 6d8cc27b..c216dd4d 100644
--- a/tests/hazmat/primitives/test_hmac.py
+++ b/tests/hazmat/primitives/test_hmac.py
@@ -13,6 +13,8 @@
 
 from __future__ import absolute_import, division, print_function
 
+import binascii
+
 import pretend
 
 import pytest
@@ -23,8 +25,6 @@ from cryptography import utils
 from cryptography.exceptions import AlreadyFinalized, UnsupportedAlgorithm
 from cryptography.hazmat.primitives import hashes, hmac, interfaces
 
-from .utils import generate_base_hmac_test
-
 
 @utils.register_interface(interfaces.HashAlgorithm)
 class UnsupportedDummyHash(object):
@@ -33,11 +33,16 @@ class UnsupportedDummyHash(object):
 
 @pytest.mark.hmac
 class TestHMAC(object):
-    test_copy = generate_base_hmac_test(
-        hashes.MD5(),
+    @pytest.mark.supported(
         only_if=lambda backend: backend.hmac_supported(hashes.MD5),
         skip_message="Does not support MD5",
     )
+    def test_hmac_copy(self, backend):
+        key = b"ab"
+        h = hmac.HMAC(binascii.unhexlify(key), hashes.MD5(), backend=backend)
+        h_copy = h.copy()
+        assert h != h_copy
+        assert h._ctx != h_copy._ctx
 
     def test_hmac_reject_unicode(self, backend):
         h = hmac.HMAC(b"mykey", hashes.SHA1(), backend=backend)