diff --git a/tests/test_interfaces.py b/tests/test_interfaces.py
index 4d571ea..329ac7d 100644
--- a/tests/test_interfaces.py
+++ b/tests/test_interfaces.py
@@ -36,6 +36,7 @@
             def method(self):
                 """Method with no arguments"""
 
+        NonImplementer().method()
         with pytest.raises(InterfaceNotImplemented):
             verify_interface(SimpleInterface, NonImplementer)
 
@@ -51,4 +52,5 @@
             def property(self):
                 """A concrete property"""
 
+        NonImplementer().property
         verify_interface(SimpleInterface, NonImplementer)
diff --git a/tests/utils.py b/tests/utils.py
index 8be5c1f..c810303 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -53,7 +53,10 @@
 def check_backend_support(item):
     supported = item.keywords.get("supported")
     if supported and "backend" in item.funcargs:
-        if not supported.kwargs["only_if"](item.funcargs["backend"]):
+        if not all(
+            mark.kwargs["only_if"](item.funcargs["backend"])
+            for mark in supported
+        ):
             pytest.skip("{0} ({1})".format(
                 supported.kwargs["skip_message"], item.funcargs["backend"]
             ))