add tests for exposing app-specific prototypes

test/application.js

@@ -295,3 +295,87 @@ describe('app.respond', function(){
     })
   })
 })
+
+describe('app.context', function(){
+  var app1 = koa();
+  app1.context.message = 'hello';
+  var app2 = koa();
+
+  it('should merge properties', function(){
+    app1.use(function *(next){
+      assert.equal(this.message, 'hello')
+      this.status = 204
+    });
+
+    request(app1.listen())
+    .get('/')
+    .expect(204);
+  })
+
+  it('should not affect the original prototype', function(){
+    app2.use(function *(next){
+      assert.equal(this.message, undefined)
+      this.status = 204;
+    });
+
+    request(app2.listen())
+    .get('/')
+    .expect(204);
+  })
+})
+
+describe('app.request', function(){
+  var app1 = koa();
+  app1.request.message = 'hello';
+  var app2 = koa();
+
+  it('should merge properties', function(){
+    app1.use(function *(next){
+      assert.equal(this.request.message, 'hello')
+      this.status = 204
+    });
+
+    request(app1.listen())
+    .get('/')
+    .expect(204);
+  })
+
+  it('should not affect the original prototype', function(){
+    app2.use(function *(next){
+      assert.equal(this.request.message, undefined)
+      this.status = 204;
+    });
+
+    request(app2.listen())
+    .get('/')
+    .expect(204);
+  })
+})
+
+describe('app.response', function(){
+  var app1 = koa();
+  app1.response.message = 'hello';
+  var app2 = koa();
+
+  it('should merge properties', function(){
+    app1.use(function *(next){
+      assert.equal(this.response.message, 'hello')
+      this.status = 204
+    });
+
+    request(app1.listen())
+    .get('/')
+    .expect(204);
+  })
+
+  it('should not affect the original prototype', function(){
+    app2.use(function *(next){
+      assert.equal(this.response.message, undefined)
+      this.status = 204;
+    });
+
+    request(app2.listen())
+    .get('/')
+    .expect(204);
+  })
+})