diff -r 324b4b10351e -r 25b2868206e2 tests/test-mv-cp-st-diff.t
--- a/tests/test-mv-cp-st-diff.t	Tue Oct 02 17:34:34 2018 -0700
+++ b/tests/test-mv-cp-st-diff.t	Fri Sep 07 11:16:06 2018 -0400
@@ -1666,4 +1666,18 @@
   @@ -0,0 +1,1 @@
   +change
 
+Check debug output for copy tracing
+
+  $ hg status --copies --rev 'desc(dev)' --rev . --config devel.debug.copies=yes --debug
+  debug.copies: searching copies from a51f36ab1704 to 7935fd48a8f9
+  debug.copies: search mode: forward
+  debug.copies:    looking into rename from a51f36ab1704 to 7935fd48a8f9
+  debug.copies:      search limit: 2
+  debug.copies:      missing file to search: 1
+  debug.copies:        tracing file: renamed
+  debug.copies:          rename of: f
+  A renamed
+    f
+  R f
+
   $ cd ..