--- a/tests/test-tags.t	Sun Dec 16 16:31:31 2018 +0900
+++ b/tests/test-tags.t	Sat Dec 15 17:52:14 2018 +0900
@@ -4,6 +4,8 @@
   > [extensions]
   > blackbox=
   > mock=$TESTDIR/mockblackbox.py
+  > [blackbox]
+  > track = command, commandfinish, tagscache
   > EOF
 
 Helper functions: