Add all dart:html tests from the sdk to test/codegen.

test/codegen/lib/html/events_test.dart

+// Copyright (c) 2013, 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 tests.html.events_test;
+
+import 'dart:async';
+import 'dart:html';
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+
+main() {
+  useHtmlConfiguration();
+
+  test('TimeStamp', () {
+    Event event = new Event('test');
+
+    int timeStamp = event.timeStamp;
+    expect(timeStamp, greaterThan(0));
+  });
+
+  test('Event canBubble and cancelable', () {
+    // Try every combination of canBubble and cancelable
+    for (var i = 0; i < 4; i++) {
+      var bubble = (i & 1) != 0;
+      var cancel = (i & 2) != 0;
+      var e = new Event('input', canBubble: bubble, cancelable: cancel);
+      expect(e.bubbles, bubble, reason: 'canBubble was set to $bubble');
+      expect(e.cancelable, cancel, reason: 'cancelable was set to $cancel');
+    }
+  });
+
+  // The next test is not asynchronous because [on['test'].dispatch(event)] fires the event
+  // and event listener synchronously.
+  test('EventTarget', () {
+    Element element = new Element.tag('test');
+    element.id = 'eventtarget';
+    window.document.body.append(element);
+
+    int invocationCounter = 0;
+    void handler(Event e) {
+      expect(e.type, equals('test'));
+      Element target = e.target;
+      expect(element, equals(target));
+      invocationCounter++;
+    }
+
+    Event event = new Event('test');
+
+    invocationCounter = 0;
+    element.dispatchEvent(event);
+    expect(invocationCounter, isZero);
+
+    var provider = new EventStreamProvider<Event>('test');
+
+    var sub = provider.forTarget(element).listen(handler);
+    invocationCounter = 0;
+    element.dispatchEvent(event);
+    expect(invocationCounter, 1);
+
+    sub.cancel();
+    invocationCounter = 0;
+    element.dispatchEvent(event);
+    expect(invocationCounter, isZero);
+
+    provider.forTarget(element).listen(handler);
+    invocationCounter = 0;
+    element.dispatchEvent(event);
+    expect(invocationCounter, 1);
+
+    provider.forTarget(element).listen(handler);
+    invocationCounter = 0;
+    element.dispatchEvent(event);
+
+    // NOTE: when run in a custom zone, the handler is wrapped
+    // The logic for html events which ensures identical handlers are added only
+    // once is therefor muted by the wrapped handlers.
+    // Hence, we get different behavior depending on the current zone.
+    if(Zone.current == Zone.ROOT) {
+      expect(invocationCounter, 1);
+    } else {
+      expect(invocationCounter, 2);
+    }
+  });
+
+  test('InitMouseEvent', () {
+    DivElement div = new Element.tag('div');
+    MouseEvent event = new MouseEvent('zebra', relatedTarget: div);
+  });
+
+  test('DOM event callbacks are associated with the correct zone', () {
+    var callbacks = [];
+
+    final element = new Element.tag('test');
+    element.id = 'eventtarget';
+    document.body.append(element);
+
+    // runZoned executes the function synchronously, but we don't want to
+    // rely on this. We therefore wrap it into an expectAsync.
+    runZoned(expectAsync(() {
+      Zone zone = Zone.current;
+      expect(zone, isNot(equals(Zone.ROOT)));
+
+      var sub;
+
+      void handler(Event e) {
+        expect(Zone.current, equals(zone));
+
+        scheduleMicrotask(expectAsync(() {
+          expect(Zone.current, equals(zone));
+          sub.cancel();
+        }));
+      }
+
+      sub = element.on['test'].listen(expectAsync(handler));
+    }));
+    element.dispatchEvent(new Event('test'));
+  });
+}