diff --git a/test/app.request.js b/test/app.request.js
index 728043a5a3..0288f80b09 100644
--- a/test/app.request.js
+++ b/test/app.request.js
@@ -1,4 +1,5 @@
 
+var after = require('after')
 var express = require('../')
   , request = require('supertest');
 
@@ -19,5 +20,123 @@ describe('app', function(){
       .get('/foo?name=tobi')
       .expect('name=tobi', done);
     })
+
+    it('should only extend for the referenced app', function (done) {
+      var app1 = express()
+      var app2 = express()
+      var cb = after(2, done)
+
+      app1.request.foobar = function () {
+        return 'tobi'
+      }
+
+      app1.get('/', function (req, res) {
+        res.send(req.foobar())
+      })
+
+      app2.get('/', function (req, res) {
+        res.send(req.foobar())
+      })
+
+      request(app1)
+        .get('/')
+        .expect(200, 'tobi', cb)
+
+      request(app2)
+        .get('/')
+        .expect(500, /(?:not a function|has no method)/, cb)
+    })
+
+    it('should inherit to sub apps', function (done) {
+      var app1 = express()
+      var app2 = express()
+      var cb = after(2, done)
+
+      app1.request.foobar = function () {
+        return 'tobi'
+      }
+
+      app1.use('/sub', app2)
+
+      app1.get('/', function (req, res) {
+        res.send(req.foobar())
+      })
+
+      app2.get('/', function (req, res) {
+        res.send(req.foobar())
+      })
+
+      request(app1)
+        .get('/')
+        .expect(200, 'tobi', cb)
+
+      request(app1)
+        .get('/sub')
+        .expect(200, 'tobi', cb)
+    })
+
+    it('should allow sub app to override', function (done) {
+      var app1 = express()
+      var app2 = express()
+      var cb = after(2, done)
+
+      app1.request.foobar = function () {
+        return 'tobi'
+      }
+
+      app2.request.foobar = function () {
+        return 'loki'
+      }
+
+      app1.use('/sub', app2)
+
+      app1.get('/', function (req, res) {
+        res.send(req.foobar())
+      })
+
+      app2.get('/', function (req, res) {
+        res.send(req.foobar())
+      })
+
+      request(app1)
+        .get('/')
+        .expect(200, 'tobi', cb)
+
+      request(app1)
+        .get('/sub')
+        .expect(200, 'loki', cb)
+    })
+
+    it('should not pollute parent app', function (done) {
+      var app1 = express()
+      var app2 = express()
+      var cb = after(2, done)
+
+      app1.request.foobar = function () {
+        return 'tobi'
+      }
+
+      app2.request.foobar = function () {
+        return 'loki'
+      }
+
+      app1.use('/sub', app2)
+
+      app1.get('/sub/foo', function (req, res) {
+        res.send(req.foobar())
+      })
+
+      app2.get('/', function (req, res) {
+        res.send(req.foobar())
+      })
+
+      request(app1)
+        .get('/sub')
+        .expect(200, 'loki', cb)
+
+      request(app1)
+        .get('/sub/foo')
+        .expect(200, 'tobi', cb)
+    })
   })
 })
diff --git a/test/app.response.js b/test/app.response.js
index c6ea77c820..ea696b566f 100644
--- a/test/app.response.js
+++ b/test/app.response.js
@@ -1,4 +1,5 @@
 
+var after = require('after')
 var express = require('../')
   , request = require('supertest');
 
@@ -20,25 +21,122 @@ describe('app', function(){
       .expect('HEY', done);
     })
 
-    it('should not be influenced by other app protos', function(done){
-      var app = express()
-        , app2 = express();
+    it('should only extend for the referenced app', function (done) {
+      var app1 = express()
+      var app2 = express()
+      var cb = after(2, done)
 
-      app.response.shout = function(str){
-        this.send(str.toUpperCase());
-      };
+      app1.response.shout = function (str) {
+        this.send(str.toUpperCase())
+      }
 
-      app2.response.shout = function(str){
-        this.send(str);
-      };
+      app1.get('/', function (req, res) {
+        res.shout('foo')
+      })
 
-      app.use(function(req, res){
-        res.shout('hey');
-      });
+      app2.get('/', function (req, res) {
+        res.shout('foo')
+      })
 
-      request(app)
-      .get('/')
-      .expect('HEY', done);
+      request(app1)
+        .get('/')
+        .expect(200, 'FOO', cb)
+
+      request(app2)
+        .get('/')
+        .expect(500, /(?:not a function|has no method)/, cb)
+    })
+
+    it('should inherit to sub apps', function (done) {
+      var app1 = express()
+      var app2 = express()
+      var cb = after(2, done)
+
+      app1.response.shout = function (str) {
+        this.send(str.toUpperCase())
+      }
+
+      app1.use('/sub', app2)
+
+      app1.get('/', function (req, res) {
+        res.shout('foo')
+      })
+
+      app2.get('/', function (req, res) {
+        res.shout('foo')
+      })
+
+      request(app1)
+        .get('/')
+        .expect(200, 'FOO', cb)
+
+      request(app1)
+        .get('/sub')
+        .expect(200, 'FOO', cb)
+    })
+
+    it('should allow sub app to override', function (done) {
+      var app1 = express()
+      var app2 = express()
+      var cb = after(2, done)
+
+      app1.response.shout = function (str) {
+        this.send(str.toUpperCase())
+      }
+
+      app2.response.shout = function (str) {
+        this.send(str + '!')
+      }
+
+      app1.use('/sub', app2)
+
+      app1.get('/', function (req, res) {
+        res.shout('foo')
+      })
+
+      app2.get('/', function (req, res) {
+        res.shout('foo')
+      })
+
+      request(app1)
+        .get('/')
+        .expect(200, 'FOO', cb)
+
+      request(app1)
+        .get('/sub')
+        .expect(200, 'foo!', cb)
+    })
+
+    it('should not pollute parent app', function (done) {
+      var app1 = express()
+      var app2 = express()
+      var cb = after(2, done)
+
+      app1.response.shout = function (str) {
+        this.send(str.toUpperCase())
+      }
+
+      app2.response.shout = function (str) {
+        this.send(str + '!')
+      }
+
+      app1.use('/sub', app2)
+
+      app1.get('/sub/foo', function (req, res) {
+        res.shout('foo')
+      })
+
+      app2.get('/', function (req, res) {
+        res.shout('foo')
+      })
+
+      request(app1)
+        .get('/sub')
+        .expect(200, 'foo!', cb)
+
+      request(app1)
+        .get('/sub/foo')
+        .expect(200, 'FOO', cb)
     })
   })
 })