diff --git a/tests/test-hgignore.t b/tests/test-hgignore.t
--- a/tests/test-hgignore.t
+++ b/tests/test-hgignore.t
@@ -176,6 +176,8 @@
   ? .hgignore
   ? a.c
   ? syntax
+  $ hg debugignore
+  <includematcher includes='(?:|.*/)[^/]*\\.o(?:/|$)'>
 
   $ cd ..
   $ echo > .hg/testhgignorerel