diff --git a/t/recursion.t b/t/recursion.t
new file mode 100644
index 0000000..0c5838c
--- /dev/null
+++ b/t/recursion.t
@@ -0,0 +1,9 @@
+;; Factorial
+
+(defun factorial (n)
+  (if (> n 1)
+      (* n (factorial (- n 1)))
+    1))
+
+(expect "Factorial of 5 is 120" (= (factorial 5) 120))
+(expect "Factorial of 1 is 1" (= (factorial 1) 1))