diff --git a/test.clx b/test.clx
index 9bf4a42..db3eefc 100644
--- a/test.clx
+++ b/test.clx
@@ -161,6 +161,10 @@ if [
 "abc" "def" s+ "abcdef" streq and
 "abc" s2l [ 97 98 99 ] streq and
 "abc" s2l l2s "abc" streq and
+[ 1 2 3 ] s2l [ 1 2 3 ] streq and
+"" s2l [ ] streq and
+[ 97 98 99 ] l2s "abc" streq and
+[ ] l2s "" streq and
 if [
   "  streq, lower, and upper PASS" puts cr
 ] [