add an object stream example

package.json

@@ -16,6 +16,7 @@
     "co-views": "~0.1.0",
     "ejs": "~0.8.5",
     "swig": "~1.2.2",
+    "streaming-json-stringify": "~1.0.0",
     "koa-logger": "~1.1.0",
     "koa-route": "~1.0.2",
     "koa-static": "~1.4.0"

stream-objects/app.js

@@ -0,0 +1,30 @@
+
+var koa = require('koa');
+var JSONStream = require('streaming-json-stringify');
+
+var app = module.exports = koa();
+
+app.use(function *(){
+  this.type = 'json';
+  var stream = this.body = JSONStream();
+
+  stream.on('error', this.onerror);
+
+  setTimeout(function(){
+    stream.write({
+      id: 1
+    });
+  }, 1);
+
+  setTimeout(function(){
+    stream.write({
+      id: 2
+    });
+  }, 2);
+
+  setTimeout(function(){
+    stream.end();
+  }, 3);
+});
+
+if (!module.parent) app.listen(3000);

stream-objects/test.js

@@ -0,0 +1,19 @@
+var app = require('./app');
+var request = require('supertest').agent(app.listen());
+
+describe('Stream Objects', function(){
+  it('GET /', function(done){
+    request
+    .get('/app.js')
+    .expect(200, function(err, res){
+      if (err) return done(err);
+
+      res.body.should.eql([{
+        id: 1
+      }, {
+        id: 2
+      }]);
+      done();
+    });
+  });
+});