diff --git a/script/test/TestInvalid.py b/script/test/TestInvalid.py
new file mode 100644
index 0000000..97f41a9
--- /dev/null
+++ b/script/test/TestInvalid.py
@@ -0,0 +1,11 @@
+import ch.psi.pshell.epics.ChannelDouble as ChannelDouble
+import ch.psi.pshell.epics.InvalidValueAction as InvalidValueAction
+import java.lang.System as System
+
+invalid = ChannelDouble("invalid", "SARUN15-UIND030:INVALID-PV", -1, True, InvalidValueAction.Nullify)
+avg = create_averager(invalid, 5, interval =2.0, name = "avg")
+
+
+invalid.monitored = True
+add_device(invalid, True)
+add_device(avg, True)
\ No newline at end of file