tests: assert calls order in middleware basic tests

closes #3878

test/middleware.basic.js

@@ -1,4 +1,5 @@
 
+var assert = require('assert')
 var express = require('../');
 var request = require('supertest');
 
@@ -33,6 +34,7 @@ describe('middleware', function(){
       .set('Content-Type', 'application/json')
       .send('{"foo":"bar"}')
       .expect('Content-Type', 'application/json')
+      .expect(function () { assert.deepEqual(calls, ['one', 'two']) })
       .expect(200, '{"foo":"bar"}', done)
     })
   })