tests: add test for hello-world example

examples/hello-world/index.js

@@ -1,6 +1,6 @@
 var express = require('../../');
 
-var app = express();
+var app = module.exports = express()
 
 app.get('/', function(req, res){
   res.send('Hello World');

test/acceptance/hello-world.js

@@ -0,0 +1,21 @@
+
+var app = require('../../examples/hello-world')
+var request = require('supertest')
+
+describe('hello-world', function () {
+  describe('GET /', function () {
+    it('should respond with hello world', function (done) {
+      request(app)
+        .get('/')
+        .expect(200, 'Hello World', done)
+    })
+  })
+
+  describe('GET /missing', function () {
+    it('should respond with 404', function (done) {
+      request(app)
+        .get('/missing')
+        .expect(404, done)
+    })
+  })
+})