get rid of decorator dependency

awx/main/tests/unit/utils/test_common.py

@@ -154,12 +154,11 @@ def test_memoize_delete(memoized_function, mock_cache):
 
 
 def test_memoize_parameter_error():
-    @common.memoize(cache_key='foo', track_function=True)
-    def fn():
-        return
 
     with pytest.raises(common.IllegalArgumentError):
-        fn()
+        @common.memoize(cache_key='foo', track_function=True)
+        def fn():
+            return
 
 
 def test_extract_ansible_vars():