pass bytes to modes/algorithms like we should
diff --git a/tests/test_fernet.py b/tests/test_fernet.py
index c272eec..dbce44f 100644
--- a/tests/test_fernet.py
+++ b/tests/test_fernet.py
@@ -45,7 +45,7 @@
 @pytest.mark.requires_backend_interface(interface=HMACBackend)
 @pytest.mark.supported(
     only_if=lambda backend: backend.cipher_supported(
-        algorithms.AES("\x00" * 32), modes.CBC("\x00" * 16)
+        algorithms.AES(b"\x00" * 32), modes.CBC(b"\x00" * 16)
     ),
     skip_message="Does not support AES CBC",
 )
@@ -126,7 +126,7 @@
 @pytest.mark.requires_backend_interface(interface=HMACBackend)
 @pytest.mark.supported(
     only_if=lambda backend: backend.cipher_supported(
-        algorithms.AES("\x00" * 32), modes.CBC("\x00" * 16)
+        algorithms.AES(b"\x00" * 32), modes.CBC(b"\x00" * 16)
     ),
     skip_message="Does not support AES CBC",
 )