dist/ember-testing.js in ember-source-2.15.0.beta.1 vs dist/ember-testing.js in ember-source-2.15.0.beta.2

@@ -4,11 +4,11 @@
  * @copyright Copyright 2011-2017 Tilde Inc. and contributors
  *            Portions Copyright 2006-2011 Strobe Inc.
  *            Portions Copyright 2008-2011 Apple Inc. All rights reserved.
  * @license   Licensed under MIT license
  *            See https://raw.github.com/emberjs/ember.js/master/LICENSE
- * @version   2.15.0-beta.1
+ * @version   2.15.0-beta.2
  */
 
 var enifed, requireModule, Ember;
 var mainContext = this; // Used in ember-environment/lib/global.js
 
@@ -226,10 +226,11 @@
     </ul>
   
     @public
     @static
     @method registerDeprecationHandler
+    @for Ember.Debug
     @param handler {Function} A function to handle deprecation calls.
     @since 2.1.0
   */
   var registerHandler = function () {}; /*global __fail__*/
 
@@ -412,17 +413,11 @@
 
         return _ret = new EmberError(message), (0, _emberBabel.possibleConstructorReturn)(_this, _ret);
       }
 
       var error = Error.call(_this, message);
-
-      if (Error.captureStackTrace) {
-        Error.captureStackTrace(_this, EmberError);
-      } else {
-        _this.stack = error.stack;
-      }
-
+      _this.stack = error.stack;
       _this.description = error.description;
       _this.fileName = error.fileName;
       _this.lineNumber = error.lineNumber;
       _this.message = error.message;
       _this.name = error.name;
@@ -889,10 +884,11 @@
         <li> <code>next</code> - A function that calls into the previously registered handler.</li>
       </ul>
        @public
       @static
       @method registerWarnHandler
+      @for Ember.Debug
       @param handler {Function} A function to handle warnings.
       @since 2.1.0
     */
     exports.registerHandler = registerHandler = function registerHandler(handler) {
       (0, _handlers.registerHandler)('warn', handler);
@@ -2319,19 +2315,21 @@
 
       lastPromise = _this;
       return _this;
     }
 
-    TestPromise.prototype.then = function then(onFulfillment) {
+    TestPromise.prototype.then = function then(_onFulfillment) {
       var _RSVP$Promise$prototy;
 
+      var onFulfillment = typeof _onFulfillment === 'function' ? function (result) {
+        return isolate(_onFulfillment, result);
+      } : undefined;
+
       for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
         args[_key - 1] = arguments[_key];
       }
 
-      return (_RSVP$Promise$prototy = _RSVP$Promise.prototype.then).call.apply(_RSVP$Promise$prototy, [this, function (result) {
-        return isolate(onFulfillment, result);
-      }].concat(args));
+      return (_RSVP$Promise$prototy = _RSVP$Promise.prototype.then).call.apply(_RSVP$Promise$prototy, [this, onFulfillment].concat(args));
     };
 
     return TestPromise;
   }(_emberRuntime.RSVP.Promise);