test rename overhaul: step 8 - language tests

tests/language/src/FactoryImplementationTest.dart

-// Copyright (c) 2011, 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.
-
-interface A default B {
-  A(int x, int y);
-}
-
-interface X default B {
-  X(int x, int y);
-}
-
-class XImpl implements X {
-  final int x;
-  final int y;
-  XImpl(this.x, this.y);
-}
-
-// new A invokes B constructor because B implements A.
-class B implements A {
-  final int x;
-  final int y;
-
-  B(this.x, this.y);
-  // This factory will never be invoked.
-  // TODO(ahe): Is this a compile time error?
-  factory A(int a, int b) {  return new B(0, 0); }
-
-  factory X(int a, int b) { return new XImpl(a * 10, b * 10); }
-}
-
-main() {
-  var a = new A(1, 2);
-  // Check that constructor B is invoked and not factory A.
-  Expect.equals(1, a.x);
-  Expect.equals(2, a.y);
-
-  var x = new X(11, 22);
-  // Check that factory is invoked.
-  Expect.equals(110, x.x);
-  Expect.equals(220, x.y);
-}