adding game_of_life sample

dart/samples/webcomponents/game_of_life/test/game_of_life_test.dart

+// 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.
+
+#library('game_of_life_tests');
+
+#import('dart:html');
+#import('package:unittest/unittest.dart');
+#import('package:unittest/html_config.dart');
+#import('../components/components.dart');
+
+main() {
+  useHtmlConfiguration();
+  test('Correct propogation of a glider', () {
+    gameOfLifeComponentsSetup();
+    var game = new GameOfLife();
+    game.stepTime = 0;
+
+    // make a glider
+    gliderPattern(game, (i, j) => game.setAliveness(i, j, true), 0, 0);
+
+    // We use 12 because it's a multiple of the period of a glider.
+    for(int i = 0; i < 12; i++) {
+      game.step();
+    }
+
+    // gliders move at c/4
+    gliderPattern(game, (i, j) => expect(game.isAlive(i, j)), 3, 3);
+
+  });
+}
+
+/** 
+ * Takes a [game], x and y offsets [x] and [y], and a function [f] of two
+ * integer inputs and calls [f] on all the squares of a glider pattern with
+ * upper left corner at ([x], [y]). Does not validate [x], [y] -- behavior on
+ * invalid [x] and [y] is undefined.
+ */
+void gliderPattern(GameOfLife game, Function f, int x, int y) {
+  f(x, y);
+  f(x + 1, y + 1);
+  f(x + 2, y);
+  f(x + 1, y + 2);
+  f(x + 2, y + 1);
+}
+
+void _componentsSetup() {
+  initializeComponents((String name) => CTOR_MAP[name], true);
+}