From d650fc9f04d6e53857eae3aa727de0e64945e63a Mon Sep 17 00:00:00 2001
From: hamzaelkhatri <hamzaelkhatri@gmail.com>
Date: Mon, 9 Oct 2023 16:34:44 +0100
Subject: [PATCH] test: add unitTest for sub exercise

---
 js/tests/sub_test.js | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 js/tests/sub_test.js

diff --git a/js/tests/sub_test.js b/js/tests/sub_test.js
new file mode 100644
index 000000000..9bbaca965
--- /dev/null
+++ b/js/tests/sub_test.js
@@ -0,0 +1,14 @@
+export const tests = []
+const t = (f) => tests.push(f)
+
+// Sub is declared and is a function and take 2 argument
+t(() => typeof Sub === 'function')
+t(() => Sub.length === 2)
+
+// Sub works with positive numbers
+t(() => Sub(5, 2) === 3)
+t(() => Sub(Sub(Sub(5, 2), 2), 2) === -1) // Sub Sub Sub !!
+
+// sub works with negative numbers
+t(() => Sub(-5, -2) === -3)
+t(() => Sub(Sub(Sub(-5, -2), -2), -2) === 1) // Sub Sub Sub !!
\ No newline at end of file