Implement a function to defer rendering via promise chaining

app/services/fastboot.js

@@ -46,5 +46,8 @@ export default Ember.Service.extend({
 
   isFastBoot: computed(function() {
     return typeof FastBoot !== 'undefined';
-  })
+  }),
+  deferRendering(promise) {
+    this._fastbootInfo.deferRendering(promise);
+  }
 });

package.json

@@ -62,7 +62,7 @@
     "broccoli-merge-trees": "^1.1.1",
     "broccoli-plugin": "^1.2.1",
     "broccoli-stew": "^1.2.0",
-    "ember-fastboot-server": "^0.6.0",
+    "ember-fastboot-server": "0.6.2",
     "express": "^4.8.5",
     "lodash.clonedeep": "^4.3.1",
     "lodash.defaults": "^4.0.1",

tests/acceptance/async-content-test.js

@@ -0,0 +1,38 @@
+var chai = require('chai');
+var expect = chai.expect;
+var RSVP = require('rsvp');
+var AddonTestApp = require('ember-cli-addon-tests').AddonTestApp;
+var request = require('request');
+var get = RSVP.denodeify(request);
+
+describe('async content via deferred content', function() {
+  this.timeout(300000);
+
+  var app;
+
+  before(function() {
+
+    app = new AddonTestApp();
+
+    return app.create('async-content')
+      .then(function() {
+        return app.startServer({
+          command: 'fastboot',
+          additionalArguments: ['--serve-assets']
+        });
+      });
+  });
+
+  after(function() {
+    return app.stopServer();
+  });
+
+  it('waits for async content when using `fastboot.deferRendering`', function() {
+    return get({
+      url: 'http://localhost:49741/'
+    })
+      .then(function(response) {
+        expect(response.body).to.contain('Async content: foo');
+      });
+  });
+});

tests/fixtures/async-content/app/components/async-content.js

@@ -0,0 +1,20 @@
+import Ember from 'ember';
+
+export default Ember.Component.extend({
+  fastboot: Ember.inject.service(),
+
+  init() {
+    this._super(...arguments);
+
+    let deferred = Ember.RSVP.defer();
+
+    Ember.run.later(() => {
+      if (!this.get('isDestroyed')) {
+        this.set('setLater', 'foo');
+      }
+      deferred.resolve()
+    }, 100);
+
+    this.get('fastboot').deferRendering(deferred.promise);
+  }
+});

tests/fixtures/async-content/app/templates/application.hbs

@@ -0,0 +1 @@
+{{async-content}}

tests/fixtures/async-content/app/templates/components/async-content.hbs

@@ -0,0 +1 @@
+Async content: {{setLater}}