Update

MOCHA/operations.js

@@ -0,0 +1,12 @@
+module.exports.multiply = function (x, y) {
+    return x * y;
+};
+module.exports.add = function (x, y) {
+    return x + y;
+};
+
+module.exports.multiplyAsync = function (a, b, callback) {
+    setTimeout(function () {
+        callback(a * b);
+    }, 1000);
+};