Replace assumption with some fakes

1 files changed, 12 insertions, 7 deletions

diff --git a/tests/hazmat/bindings/test_openssl.py b/tests/hazmat/bindings/test_openssl.py
index 3523fa4e..4e8dfa58 100644
--- a/tests/hazmat/bindings/test_openssl.py
+++ b/tests/hazmat/bindings/test_openssl.py
@@ -11,15 +11,21 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import binascii
-
 import pytest
 
 from cryptography.exceptions import UnsupportedAlgorithm
 from cryptography.hazmat.bindings.openssl.backend import backend, Backend
 from cryptography.hazmat.primitives.block import BlockCipher
-from cryptography.hazmat.primitives.block.ciphers import AES, TripleDES
-from cryptography.hazmat.primitives.block.modes import CBC, ECB
+from cryptography.hazmat.primitives.block.ciphers import AES
+from cryptography.hazmat.primitives.block.modes import CBC
+
+
+class FakeMode(object):
+    pass
+
+
+class FakeCipher(object):
+    pass
 
 
 class TestOpenSSL(object):
@@ -51,12 +57,11 @@ class TestOpenSSL(object):
 
     def test_nonexistent_cipher(self):
         b = Backend()
-        # TODO: this test assumes that 3DES-ECB doesn't exist
         b.ciphers.register_cipher_adapter(
-            TripleDES, ECB, lambda backend, cipher, mode: backend.ffi.NULL
+            FakeCipher, FakeMode, lambda backend, cipher, mode: backend.ffi.NULL
         )
         cipher = BlockCipher(
-            TripleDES(binascii.unhexlify(b"0" * 16)), ECB(), backend=b
+            FakeCipher(), FakeMode(), backend=b,
         )
         with pytest.raises(UnsupportedAlgorithm):
             cipher.encryptor()