|  | // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file | 
|  | // for details. All rights reserved. Use of this source code is governed by a | 
|  | // BSD-style license that can be found in the LICENSE file. | 
|  | // Dart test to verify that factory classes are working. | 
|  |  | 
|  | import "package:expect/expect.dart"; | 
|  |  | 
|  | abstract class Point { | 
|  | factory Point(int x, int y) = PointImplementation; | 
|  |  | 
|  | final int x = -1; | 
|  | final int y = -1; | 
|  | } | 
|  |  | 
|  | class PointImplementation implements Point { | 
|  | const PointImplementation(int x, int y) | 
|  | : this.x = x, | 
|  | this.y = y; | 
|  | final int x; | 
|  | final int y; | 
|  | } | 
|  |  | 
|  | class DefaultImplementationTest { | 
|  | static void testMain() { | 
|  | Point point = new Point(4, 2); | 
|  | Expect.equals(4, point.x); | 
|  | Expect.equals(2, point.y); | 
|  | } | 
|  | } | 
|  |  | 
|  | main() { | 
|  | DefaultImplementationTest.testMain(); | 
|  | } |