Update: add 9-api folder

Author: Mar-Issah

0x06-unittests_in_js/9-api/api.test.js

@@ -5,31 +5,31 @@ describe('API integration test', () => {
   const API_URL = 'http://localhost:7865';
 
   it('GET / returns correct response', (done) => {
-    request.get(`${API_URL}/`, (_err, res, body) => {
-      expect(res.statusCode).to.be.equal(200);
+    request.get(`${API_URL}/`, (_err, response, body) => {
+      expect(response.statusCode).to.be.equal(200);
       expect(body).to.be.equal('Welcome to the payment system');
       done();
     });
   });
 
   it('GET /cart/:id returns correct response for valid :id', (done) => {
-    request.get(`${API_URL}/cart/47`, (_err, res, body) => {
-      expect(res.statusCode).to.be.equal(200);
+    request.get(`${API_URL}/cart/47`, (_err, response, body) => {
+      expect(response.statusCode).to.be.equal(200);
       expect(body).to.be.equal('Payment methods for cart 47');
       done();
     });
   });
 
   it('GET /cart/:id returns 404 response for negative number values in :id', (done) => {
-    request.get(`${API_URL}/cart/-47`, (_err, res, _body) => {
-      expect(res.statusCode).to.be.equal(404);
+    request.get(`${API_URL}/cart/-47`, (_err, response, _body) => {
+      expect(response.statusCode).to.be.equal(404);
       done();
     });
   });
 
   it('GET /cart/:id returns 404 response for non-numeric values in :id', (done) => {
-    request.get(`${API_URL}/cart/d200-44a5-9de6`, (_err, res, _body) => {
-      expect(res.statusCode).to.be.equal(404);
+    request.get(`${API_URL}/cart/d200-44a5-9de6`, (_err, response, _body) => {
+      expect(response.statusCode).to.be.equal(404);
       done();
     });
   });