diff --git a/scripts/sum.js b/scripts/sum.js
new file mode 100644
index 0000000..b537e81
--- /dev/null
+++ b/scripts/sum.js
@@ -0,0 +1,13 @@
+const assert = require("assert");
+
+function sum(a, b) {
+  return a + b;
+}
+
+console.log(sum(2, 3));
+
+assert.strictEqual(sum(2, 3), 5);
+assert.strictEqual(sum(0, 0), 0);
+assert.strictEqual(sum(-1, 1), 0);
+
+console.log("All tests passed");