diff --git a/src/calibre/devices/usbobserver/test.py b/src/calibre/devices/usbobserver/test.py
deleted file mode 100644
index 010bd9e06c..0000000000
--- a/src/calibre/devices/usbobserver/test.py
+++ /dev/null
@@ -1,8 +0,0 @@
-from __future__ import print_function
-import gc, usbobserver
-
-a = None
-print(len(gc.get_objects()))
-usbobserver.get_devices()
-gc.collect()
-print(len(gc.get_objects()))