diff --git a/src/pvecontrol/test_pvecontrol.py b/src/pvecontrol/test_pvecontrol.py
new file mode 100644
index 0000000..10765ea
--- /dev/null
+++ b/src/pvecontrol/test_pvecontrol.py
@@ -0,0 +1,6 @@
+from . import pvecontrol
+
+def test_filter_keys():
+  input = {'test': "toto", 'none': "noninclude"}
+  filter = ["test"]
+  assert pvecontrol._filter_keys(input, filter) == {'test': "toto"}