diff --git a/tests/123.lm b/tests/123.lm
index c15168a28..666f76139 100644
--- a/tests/123.lm
+++ b/tests/123.lm
@@ -1,2 +1,4 @@
 
-main := print "123"
+main := (
+   print_s 123
+);
diff --git a/tests/c_cli.rs b/tests/c_cli.rs
index 27739303a..c9f3125b9 100644
--- a/tests/c_cli.rs
+++ b/tests/c_cli.rs
@@ -22,3 +22,13 @@ fn compile_and_run(fp: &str) -> String {
 fn cli_123() {
    assert_eq!( compile_and_run("tests/123.lm"), "123" );
 }
+
+#[test]
+fn cli_nil() {
+   assert_eq!( compile_and_run("tests/nil.lm"), "()" );
+}
+
+#[test]
+fn cli_cons() {
+   assert_eq!( compile_and_run("tests/cons.lm"), "(123 . (() . 456))" );
+}
diff --git a/tests/cons.lm b/tests/cons.lm
new file mode 100644
index 000000000..190dc3627
--- /dev/null
+++ b/tests/cons.lm
@@ -0,0 +1,4 @@
+
+main := (
+   print_s (123 () 456)
+);
diff --git a/tests/nil.lm b/tests/nil.lm
new file mode 100644
index 000000000..024fe57d1
--- /dev/null
+++ b/tests/nil.lm
@@ -0,0 +1,4 @@
+
+main := (
+   print_s ()
+);