diff --git a/selftest/lock_test_help.py b/selftest/lock_test_help.py
new file mode 100644
index 0000000..0549981
--- /dev/null
+++ b/selftest/lock_test_help.py
@@ -0,0 +1,17 @@
+import sys
+import time
+
+import _prep
+
+from osmo_gsm_tester.util import FileLock
+
+fl = FileLock('/tmp/lock_test', '_'.join(sys.argv[1:]))
+
+with fl:
+    print('acquired lock: %r' % fl.owner)
+    sys.stdout.flush()
+    time.sleep(0.5)
+    print('leaving lock: %r' % fl.owner)
+    sys.stdout.flush()
+
+# vim: expandtab tabstop=4 shiftwidth=4