Added CMAC tests
diff --git a/pytest.ini b/pytest.ini
index b590d0b..cb6a80a 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -2,6 +2,7 @@
 addopts = -r s
 markers =
     cipher: this test requires a backend providing CipherBackend
+    cmac: this test requires a backend providing CMACBackend
     dsa: this test requires a backend providing DSABackend
     hash: this test requires a backend providing HashBackend
     hmac: this test requires a backend providing HMACBackend