📝 Added sandbox (code sketchbook)

sandbox/jest/test/calculator.test.js

@@ -0,0 +1,22 @@
+const mathOperations = require('../calculator')
+
+describe("Calculator tests", () => {
+    test('adding 1 + 2 should return 3', () => {
+        // arrange and act
+        expect(mathOperations.sum(1,2)).toBe(3)
+    })
+
+    test("subtracting 2 from 10 should return 8", () => {
+        // arrange and act
+        let result = mathOperations.diff(10,2)
+        // assert
+        expect(result).toBe(8)
+    })
+
+    test("multiplying 2 and 8 should return 16", () => {
+        // arrange and act
+        let result = mathOperations.product(2,8)
+        // assert
+        expect(result).toBe(16)
+    })
+})