add test case

1 files changed, 21 insertions, 4 deletions

diff --git a/tests/let-binding.lisp b/tests/let-binding.lisp
index 33d021e..eead06a 100644
--- a/tests/let-binding.lisp
+++ b/tests/let-binding.lisp
@@ -1,7 +1,24 @@
-(assert-error (let ((i 0)) (i > 4)))
-
-(assert (= 3
 (let ((a 1)
       (b 2))
-  (+ a b))))
+  (assert (= 3 (+ a b))))
+
+;; let is letrec by default
+(let ((a 1)
+      (b (+ a 1)))
+  (assert (= 2 b)))
+
+(let ((my-evenp
+       (lambda (x)
+         (if (= x 0)
+           #t
+           (funcall my-oddp (- x 1)))))
+      (my-oddp
+        (lambda (x)
+          (if (= x 0)
+            #f
+            (funcall my-evenp (- x 1))))))
+  (assert (funcall my-evenp 10))
+  (assert (funcall my-oddp 9))
+  (assert (not (funcall my-evenp 9)))
+  (assert (not (funcall my-oddp 10))))