1 files changed, 16 insertions, 0 deletions
diff --git a/tests/conftest.py b/tests/conftest.py
index 71662802..e059b630 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,5 +1,21 @@
+import pytest
+
+from cryptography.hazmat.backends.interfaces import (
+    HMACBackend, CipherBackend, HashBackend
+)
+
+from .utils import check_for_iface
+
+
 def pytest_generate_tests(metafunc):
     from cryptography.hazmat.backends import _ALL_BACKENDS
 
     if "backend" in metafunc.fixturenames:
         metafunc.parametrize("backend", _ALL_BACKENDS)
+
+
+@pytest.mark.trylast
+def pytest_runtest_setup(item):
+    check_for_iface("hmac", HMACBackend, item)
+    check_for_iface("cipher", CipherBackend, item)
+    check_for_iface("hash", HashBackend, item)