diff --git a/tests/test-log b/tests/test-log
--- a/tests/test-log
+++ b/tests/test-log
@@ -76,3 +76,8 @@ hg log --follow-first
 
 echo % log -P 2
 hg log -P 2
+
+echo '% log -r ""'
+hg log -r ''
+
+exit 0