Merge branch 'master' of https://github.com/pyca/cryptography into verify

Conflicts:
	tests/hazmat/primitives/test_hashes.py
	tests/hazmat/primitives/test_hmac.py

1 files changed, 20 insertions, 1 deletions

diff --git a/tests/test_utils.py b/tests/test_utils.py
index 5c58fd76..a65091ff 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -14,14 +14,33 @@
 import os
 import textwrap
 
+import pretend
+
 import pytest
 
 from .utils import (
     load_nist_vectors, load_vectors_from_file, load_cryptrec_vectors,
-    load_openssl_vectors, load_hash_vectors,
+    load_openssl_vectors, load_hash_vectors, check_for_iface
 )
 
 
+class FakeInterface(object):
+    pass
+
+
+def test_check_for_iface():
+    item = pretend.stub(keywords=["fake_name"], funcargs={"backend": True})
+    with pytest.raises(pytest.skip.Exception) as exc_info:
+        check_for_iface("fake_name", FakeInterface, item)
+    assert exc_info.value.args[0] == "True backend does not support fake_name"
+
+    item = pretend.stub(
+        keywords=["fake_name"],
+        funcargs={"backend": FakeInterface()}
+    )
+    check_for_iface("fake_name", FakeInterface, item)
+
+
 def test_load_nist_vectors():
     vector_data = textwrap.dedent("""
     # CAVS 11.1