feat: Add order items method (#85)

* feat: Adding Items method for Orders class

* test: Tests passing

* build: Rollup

src/endpoints/orders.js

@@ -7,6 +7,10 @@ class OrdersEndpoint extends BaseExtend {
     this.endpoint = 'orders';
   }
 
+  Items(id) {
+    return this.request.send(`${this.endpoint}/${id}/items`, 'GET');
+  }
+
   Payment(id, body) {
     return this.request.send(`${this.endpoint}/${id}/payments`, 'POST', body);
   }

test/factories.js

@@ -149,3 +149,15 @@ exports.ordersArray = [{
   type: 'order',
   status: 'cancelled',
 }];
+
+exports.orderItemsArray = [{
+  id: 'item-1',
+  type: 'order_item',
+  quantity: 2,
+  product_id: 'product-1',
+}, {
+  id: 'item-2',
+  type: 'order_item',
+  quantity: 1,
+  product_id: 'product-2',
+}];

test/unit/orders.js

@@ -6,6 +6,7 @@ const assert = require('chai').assert;
 const nock = require('nock');
 const moltin = require('../../dist/moltin.cjs.js');
 const orders = require('../factories').ordersArray;
+const orderItems = require('../factories').orderItemsArray;
 
 const apiUrl = 'https://api.moltin.com/v2';
 
@@ -53,6 +54,24 @@ describe('Moltin orders', () => {
     });
   });
 
+  it('should return an array of items from an order', () => {
+    // Intercept the API request
+    nock(apiUrl, {
+      reqHeaders: {
+        Authorization: 'a550d8cbd4a4627013452359ab69694cd446615a',
+        'Content-Type': 'application/json',
+      },
+    })
+    .get('/orders/order-1/items')
+    .reply(200, orderItems[0]);
+
+    return Moltin.Orders.Items(orders[0].id)
+    .then((response) => {
+      assert.propertyVal(response, 'id', 'item-1');
+      assert.propertyVal(response, 'product_id', 'product-1');
+    });
+  });
+
   it('should complete a payment for an order', () => {
     // Intercept the API request
     nock(apiUrl, {