1 files changed, 20 insertions, 5 deletions
diff --git a/tests/hazmat/primitives/test_hmac.py b/tests/hazmat/primitives/test_hmac.py
index a44838cf..992bcb1a 100644
--- a/tests/hazmat/primitives/test_hmac.py
+++ b/tests/hazmat/primitives/test_hmac.py
@@ -19,6 +19,7 @@ import pytest
 
 import six
 
+from cryptography.exceptions import AlreadyFinalized
 from cryptography.hazmat.primitives import hashes, hmac
 
 from .utils import generate_base_hmac_test
@@ -27,7 +28,7 @@ from .utils import generate_base_hmac_test
 class TestHMAC(object):
     test_copy = generate_base_hmac_test(
         hashes.MD5(),
-        only_if=lambda backend: backend.hashes.supported(hashes.MD5),
+        only_if=lambda backend: backend.hash_supported(hashes.MD5),
         skip_message="Does not support MD5",
     )
 
@@ -37,14 +38,28 @@ class TestHMAC(object):
             h.update(six.u("\u00FC"))
 
     def test_copy_backend_object(self):
-        pretend_hmac = pretend.stub(copy_ctx=lambda a: True)
+        pretend_hmac = pretend.stub()
         pretend_backend = pretend.stub(hmacs=pretend_hmac)
-        pretend_ctx = pretend.stub()
+        copied_ctx = pretend.stub()
+        pretend_ctx = pretend.stub(copy=lambda: copied_ctx)
         h = hmac.HMAC(b"key", hashes.SHA1(), backend=pretend_backend,
                       ctx=pretend_ctx)
         assert h._backend is pretend_backend
         assert h.copy()._backend is pretend_backend
 
-    def test_hmac_algorithm_instance(self):
+    def test_hmac_algorithm_instance(self, backend):
         with pytest.raises(TypeError):
-            hmac.HMAC(b"key", hashes.SHA1)
+            hmac.HMAC(b"key", hashes.SHA1, backend=backend)
+
+    def test_raises_after_finalize(self, backend):
+        h = hmac.HMAC(b"key", hashes.SHA1(), backend=backend)
+        h.finalize()
+
+        with pytest.raises(AlreadyFinalized):
+            h.update(b"foo")
+
+        with pytest.raises(AlreadyFinalized):
+            h.copy()
+
+        with pytest.raises(AlreadyFinalized):
+            h.finalize()