diff --git a/utils/src/lessons/tovon.js b/utils/src/lessons/tovon.js
new file mode 100644
index 0000000..41e8b3d
--- /dev/null
+++ b/utils/src/lessons/tovon.js
@@ -0,0 +1,3 @@
+export function sum(a, b) {
+    return a + b;
+}
diff --git a/utils/src/lessons/tovon.test.js b/utils/src/lessons/tovon.test.js
new file mode 100644
index 0000000..43bdf89
--- /dev/null
+++ b/utils/src/lessons/tovon.test.js
@@ -0,0 +1,8 @@
+import { describe, it, expect } from 'vitest';
+import { sum } from './tovon';
+
+describe(sum.name, () => {
+    it('should add 2 numbers', () => {
+        expect(sum(2, 4)).toBe(6);
+    });
+});