diff --git a/tests/test-tags b/tests/test-tags
--- a/tests/test-tags
+++ b/tests/test-tags
@@ -32,12 +32,31 @@ hg id
 hg status
 
 hg commit -m "merge" -d "1000000 0"
+
+# create fake head, make sure tag not visible afterwards
+cp .hgtags tags
+hg tag -d "1000000 0" last
+hg rm .hgtags
+hg commit -m "remove" -d "1000000 0"
+
+mv tags .hgtags
+hg add .hgtags
+hg commit -m "readd" -d "1000000 0"
+
+hg tags
+
 # invalid tags
 echo "spam" >> .hgtags
 echo >> .hgtags
 echo "foo bar" >> .hgtags
 echo "$T invalid" | sed "s/..../a5a5/" >> .hg/localtags
 hg commit -m "tags" -d "1000000 0"
+
+# report tag parse error on other head
+hg up 3
+echo 'x y' >> .hgtags
+hg commit -m "head" -d "1000000 0"
+
 hg tags
 hg tip