diff --git a/script/test/TestInvalid.py b/script/test/TestInvalid.py
index 97f41a9..4487a0e 100644
--- a/script/test/TestInvalid.py
+++ b/script/test/TestInvalid.py
@@ -1,11 +1,10 @@
 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
+channel = ChannelDouble("test_inv", "SARUN15-UIND030:INVALID-PV", -1, True, InvalidValueAction.Nullify)
+avg = create_averager(channel, 5, interval =2.0, name = "avg")
+
+channel.monitored = True
+add_device(channel, True)
+add_device(avg, True)
+