Add a failing test for "0" not being modified

diff --git a/xt/tt.t b/xt/tt.t
index 8d0fab9..573c141 100644 (file)
--- a/xt/tt.t
+++ b/xt/tt.t
@@ -44,4 +44,6 @@ is(
         .'-> & so "on" <-'
 );
 
+is( do_tt('"0"', {}), '"0"' );
+
 done_testing;