3 files changed, 14 insertions, 6 deletions
diff --git a/tests/hazmat/backends/test_commoncrypto.py b/tests/hazmat/backends/test_commoncrypto.py
index 1062b2ba..72ed61c0 100644
--- a/tests/hazmat/backends/test_commoncrypto.py
+++ b/tests/hazmat/backends/test_commoncrypto.py
@@ -16,7 +16,7 @@ from __future__ import absolute_import, division, print_function
 import pytest
 
 from cryptography import utils
-from cryptography.exceptions import UnsupportedCipher, InternalError
+from cryptography.exceptions import InternalError, UnsupportedCipher
 from cryptography.hazmat.bindings.commoncrypto.binding import Binding
 from cryptography.hazmat.primitives import interfaces
 from cryptography.hazmat.primitives.ciphers.algorithms import AES
diff --git a/tests/hazmat/backends/test_multibackend.py b/tests/hazmat/backends/test_multibackend.py
index 31fb0a26..c5c0d82a 100644
--- a/tests/hazmat/backends/test_multibackend.py
+++ b/tests/hazmat/backends/test_multibackend.py
@@ -20,7 +20,7 @@ from cryptography.exceptions import (
     UnsupportedAlgorithm, UnsupportedCipher, UnsupportedHash
 )
 from cryptography.hazmat.backends.interfaces import (
-    CipherBackend, HashBackend, HMACBackend, PBKDF2HMACBackend, RSABackend
+    CipherBackend, HMACBackend, HashBackend, PBKDF2HMACBackend, RSABackend
 )
 from cryptography.hazmat.backends.multibackend import MultiBackend
 from cryptography.hazmat.primitives import hashes, hmac
diff --git a/tests/hazmat/backends/test_openssl.py b/tests/hazmat/backends/test_openssl.py
index ebabd5f1..3747f436 100644
--- a/tests/hazmat/backends/test_openssl.py
+++ b/tests/hazmat/backends/test_openssl.py
@@ -17,11 +17,11 @@ import pytest
 
 from cryptography import utils
 from cryptography.exceptions import (
-    UnsupportedCipher, UnsupportedHash, InternalError
+    InternalError, UnsupportedCipher, UnsupportedHash
 )
-from cryptography.hazmat.backends.openssl.backend import backend, Backend
-from cryptography.hazmat.primitives import interfaces, hashes
-from cryptography.hazmat.primitives.asymmetric import rsa, padding
+from cryptography.hazmat.backends.openssl.backend import Backend, backend
+from cryptography.hazmat.primitives import hashes, interfaces
+from cryptography.hazmat.primitives.asymmetric import padding, rsa
 from cryptography.hazmat.primitives.ciphers import Cipher
 from cryptography.hazmat.primitives.ciphers.algorithms import AES
 from cryptography.hazmat.primitives.ciphers.modes import CBC
@@ -40,6 +40,11 @@ class DummyCipher(object):
     name = "dummy-cipher"
 
 
+@utils.register_interface(interfaces.HashAlgorithm)
+class DummyHash(object):
+    name = "dummy-hash"
+
+
 class TestOpenSSL(object):
     def test_backend_exists(self):
         assert backend
@@ -173,6 +178,9 @@ class TestOpenSSL(object):
                 backend
             )
 
+    def test_unsupported_mgf1_hash_algorithm(self):
+        assert backend.mgf1_hash_supported(DummyHash()) is False
+
     # This test is not in the next class because to check if it's really
     # default we don't want to run the setup_method before it
     def test_osrandom_engine_is_default(self):