Update: add 3-payment.js file

Author: Mar-Issah

0x06-unittests_in_js/3-payment.js

@@ -0,0 +1,8 @@
+const Utils = require('./utils');
+
+const sendPaymentRequestToApi = (totalAmount, totalShipping) => {
+  const total = Utils.calculateNumber('SUM', totalAmount, totalShipping);
+  console.log(`The total is: ${total}`);
+};
+
+module.exports = sendPaymentRequestToApi;

0x06-unittests_in_js/3-payment.test.js

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+const sinon = require('sinon');
+const Utils = require('./utils');
+const { expect } = require('chai');
+const sendPaymentRequestToApi = require('./3-payment');
+
+describe('sendPaymentRequestToApi', () => {
+  it('sendPaymentRequestToApi uses the calculateNumber method of Utils', () => {
+    const sender = sinon.spy(Utils);
+
+    sendPaymentRequestToApi(100, 20);
+    expect(sender.calculateNumber.calledWith('SUM', 100, 20)).to.be.true;
+    expect(sender.calculateNumber.callCount).to.be.equal(1);
+    sender.calculateNumber.restore();
+  });
+});

0x06-unittests_in_js/utils.js

@@ -0,0 +1,16 @@
+const Utils = {
+  calculateNumber(type, a, b) {
+    if (type === 'SUM') {
+      return Math.round(a) + Math.round(b);
+    }
+    if (type === 'SUBTRACT') {
+      return Math.round(a) - Math.round(b);
+    }
+    if (type === 'DIVIDE') {
+      return Math.round(b) === 0 ? 'Error' : Math.round(a) / Math.round(b);
+    }
+    return 0;
+  },
+};
+
+module.exports = Utils;