diff --git a/tests/test-mq b/tests/test-mq
--- a/tests/test-mq
+++ b/tests/test-mq
@@ -126,3 +126,28 @@ echo x>x
 hg ci -Ama
 hg strip tip 2>&1 | sed 's/\(saving bundle to \).*/\1/'
 hg unbundle .hg/strip-backup/*
+
+cat >>$HGTMP/.hgrc <<EOF
+[diff]
+git = True
+EOF
+cd ..
+hg init git
+cd git
+hg qinit
+
+hg qnew -m'new file' new
+echo foo > new
+chmod +x new
+hg add new
+hg qrefresh
+sed -e "s/\(\(---\|+++\) [a-zA-Z0-9_/.-]*\).*/\1/" .hg/patches/new
+
+hg qnew -m'copy file' copy
+hg cp new copy
+hg qrefresh
+sed -e "s/\(\(---\|+++\) [a-zA-Z0-9_/.-]*\).*/\1/" .hg/patches/copy
+
+hg qpop
+hg qpush
+hg qdiff