Only start uploader when all files have been setup

addon/system/file.js

@@ -159,7 +159,9 @@ export default Ember.Object.extend({
       if (this.file.status === plupload.FAILED) {
         this.file.status = plupload.QUEUED;
       }
-      uploader.start();
+      if (this.get('queue').every((f) => f.settings)) {
+        uploader.start();
+      }
     }
 
     return this._deferred.promise;

addon/system/upload-queue.js

@@ -138,7 +138,8 @@ export default Ember.ArrayProxy.extend({
     for (let i = 0, len = files.length; i < len; i++) {
       var file = File.create({
         uploader: uploader,
-        file: files[i]
+        file: files[i],
+        queue: this
       });
 
       this.pushObject(file);

tests/unit/system/file-test.js

@@ -0,0 +1,41 @@
+import Ember from 'ember';
+import UploadQueue from 'ember-plupload/system/upload-queue';
+import File from 'ember-plupload/system/file';
+import {
+  module,
+  test
+} from 'qunit';
+
+module('File', {
+});
+
+test("#upload - it will only call its uploader's start method when all queued files have been setup (settings are set on all files)", function(assert) {
+  assert.expect(3);
+  let uploadCalls = 0;
+  const TestableFile = File.extend({
+    upload() {
+      uploadCalls++;
+      return this._super(...arguments);
+    }
+  });
+
+  const uploader = Ember.Object.extend({
+    start() {
+      assert.equal(uploadCalls, 2, 'Uploader was only started after both files were setup');
+    }
+  }).create();
+
+  const fileToUpload1 = {id: 1};
+  const fileToUpload2 = {id: 2};
+  const queue = UploadQueue.create();
+  const file1 = TestableFile.create({uploader, queue, file: fileToUpload1});
+  const file2 = TestableFile.create({uploader, queue, file: fileToUpload2});
+
+  queue.pushObject(file1);
+  queue.pushObject(file2);
+
+  file2.upload('www.example.com');
+  assert.equal(uploadCalls, 1, 'first file called #upload');
+  file1.upload('www.example.com');
+  assert.equal(uploadCalls, 2, 'second file called #upload');
+});