diff --git a/t/t4001-diff-rename.sh b/t/t4001-diff-rename.sh
--- a/t/t4001-diff-rename.sh
+++ b/t/t4001-diff-rename.sh
Line 13
Line 14
EOF
Line 13
Line 14
EOF
+
+test_expect_success \
+ 'validate the output.' \
+ 'diff -I "rename similarity.*" >/dev/null current expected'
+
+test_done