added test for launch sort builder

test/builders/launch-sort.test.js

@@ -0,0 +1,27 @@
+
+const request = require('supertest');
+const app = require('../../src/app');
+
+beforeAll((done) => {
+  app.on('ready', () => {
+    done();
+  });
+});
+
+//------------------------------------------------------------
+//                     Launch Sort Test
+//------------------------------------------------------------
+
+test('It should return launches sorted from smallest to greatest', () => {
+  return request(app).get('/v2/launches?order=asc').then((response) => {
+    expect(response.statusCode).toBe(200);
+    expect(response.body[0]).toHaveProperty('flight_number', 1);
+  });
+});
+
+test('It should return launches sorted from greatest to smallest', () => {
+  return request(app).get('/v2/launches?order=desc').then((response) => {
+    expect(response.statusCode).toBe(200);
+    expect(response.body[response.body.length - 1]).toHaveProperty('flight_number', 1);
+  });
+});