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packages/web_components/test/interop_test.dart

Index: packages/web_components/test/interop_test.dart
diff --git a/packages/web_components/test/interop_test.dart b/packages/web_components/test/interop_test.dart
new file mode 100644
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--- /dev/null
+++ b/packages/web_components/test/interop_test.dart
@@ -0,0 +1,163 @@
+// 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 template_wrappers_test;
+
+import 'dart:html';
+import 'dart:async';
+import 'dart:js' show context, JsObject;
+import 'package:unittest/html_config.dart';
+import 'package:unittest/unittest.dart';
+import 'package:web_components/interop.dart';
+import 'package:web_components/polyfill.dart';
+
+main() {
+  useHtmlConfiguration();
+  setUp(() => customElementsReady);
+
+  test('interop is supported', () {
+    expect(isSupported, isTrue);
+  });
+
+  test('previously created elements are not upgraded', () {
+    var a = document.querySelector('x-a');
+    expect(a is HtmlElement, isTrue, reason: 'x-a is HtmlElement');
+    expect(a is XAWrapper, isFalse, reason: 'x-a should not be upgraded yet');
+    expect(_readX(a), 0);
+
+    var b = document.querySelector('[is=x-b]');
+    expect(b is DivElement, isTrue, reason: 'x-b is DivElement');
+    expect(b is XBWrapper, isFalse, reason: 'x-b should not be upgraded yet');
+    expect(_readX(b), 1);
+
+    var d = document.querySelector('x-d');
+    expect(d is HtmlElement, isTrue, reason: 'x-d is HtmlElement');
+    expect(d is XDWrapper, isFalse, reason: 'x-d should not be upgraded yet');
+    expect(_readX(d), 2);
+
+    /// Note: this registration has a global side-effect and is assumed in the
+    /// following tests.
+    registerDartType('x-a', XAWrapper);
+    registerDartType('x-b', XBWrapper, extendsTag: 'div');
+    registerDartType('x-c', XCWrapper);
+    onlyUpgradeNewElements();
+    registerDartType('x-d', XDWrapper); // late on purpose.
+
+    a = document.querySelector('x-a');
+    expect(a is HtmlElement, isTrue, reason: 'x-a is HtmlElement');
+    expect(a is XAWrapper, isTrue, reason: 'x-a is upgraded to XAWrapper');
+    expect(a.x, 0);
+    expect(a.wrapperCount, 0);
+
+    b = document.querySelector('[is=x-b]');
+    expect(b is DivElement, isTrue, reason: 'x-b is DivElement');
+    expect(b is XBWrapper, isTrue, reason: 'x-b is upgraded to XBWrapper');
+    expect(b.x, 1);
+    expect(b.wrapperCount, 1);
+
+    // x-d was not upgraded because its registration came after we stopped
+    // upgrading old elements:
+    d = document.querySelector('x-d');
+    expect(d is HtmlElement, isTrue, reason: 'x-d is HtmlElement');
+    expect(d is XDWrapper, isFalse, reason: 'x-d should not be upgraded yet');
+    expect(_readX(d), 2);
+
+    var c = document.querySelector('x-c');
+    expect(c is HtmlElement, isTrue, reason: 'x-c is HtmlElement');
+    expect(c is XCWrapper, isFalse, reason: 'x-c should not be upgraded yet');
+    expect(_readX(c), null, reason: 'x-c has not been registered in JS yet');
+  });
+
+  test('anything created after registering Dart type is upgraded', () {
+    context.callMethod('addA');
+    var list = document.querySelectorAll('x-a');
+    expect(list.length, 2);
+    var a = list[1];
+    expect(a is HtmlElement, isTrue, reason: 'x-a is HtmlElement');
+    expect(a is XAWrapper, isTrue, reason: 'x-a is upgraded to XAWrapper');
+    expect(a.x, 3);
+    expect(a.wrapperCount, 2);
+
+    context.callMethod('addB');
+    list = document.querySelectorAll('[is=x-b]');
+    expect(list.length, 2);
+    var b = list[1];
+    expect(b is DivElement, isTrue, reason: 'x-b is DivElement');
+    expect(b is XBWrapper, isTrue, reason: 'x-b is upgraded to XBWrapper');
+    expect(b.x, 4);
+    expect(b.wrapperCount, 3);
+
+    // New instances of x-d should be upgraded regardless.
+    context.callMethod('addD');
+    list = document.querySelectorAll('x-d');
+    expect(list.length, 2);
+    var d = list[1];
+    expect(d is HtmlElement, isTrue, reason: 'x-d is HtmlElement');
+    expect(d is XDWrapper, isTrue, reason: 'x-d is upgraded to XDWrapper');
+    expect(d.x, 5);
+    expect(d.wrapperCount, 4);
+  });
+
+  test('events seen if Dart type is registered before registerElement', () {
+    var c = document.querySelector('x-c');
+    expect(c is XCWrapper, isFalse);
+    expect(_readX(c), null, reason: 'x-c has not been registered in JS yet');
+
+    context.callMethod('registerC');
+    c = document.querySelector('x-c');
+    expect(c is XCWrapper, isTrue);
+    expect(c.x, 6);
+    expect(c.wrapperCount, 5);
+
+    context.callMethod('addC');
+    var list = document.querySelectorAll('x-c');
+    expect(list.length, 2);
+    expect(list[0], c);
+    c = list[1];
+    expect(c is HtmlElement, isTrue, reason: 'x-c is HtmlElement');
+    expect(c is XCWrapper, isTrue, reason: 'x-c is upgraded to XCWrapper');
+    expect(c.x, 7);
+    expect(c.wrapperCount, 6);
+  });
+
+  test('element can extend another element', () {
+    registerDartType('x-e', XEWrapper);
+    context.callMethod('addE');
+
+    var e = document.querySelector('x-e');
+    expect(e is XEWrapper, isTrue);
+    expect(e.x, 8);
+    expect(e.y, 9);
+  });
+}
+int _count = 0;
+
+abstract class Wrapper {
+  int wrapperCount = _count++;
+  int get x => _readX(this);
+}
+
+_readX(e) => new JsObject.fromBrowserObject(e)['x'];
+
+class XAWrapper extends HtmlElement with Wrapper {
+  XAWrapper.created() : super.created();
+}
+
+class XBWrapper extends DivElement with Wrapper {
+  XBWrapper.created() : super.created();
+}
+
+class XCWrapper extends HtmlElement with Wrapper {
+  XCWrapper.created() : super.created();
+}
+
+class XDWrapper extends HtmlElement with Wrapper {
+  XDWrapper.created() : super.created();
+}
+
+class XEWrapper extends HtmlElement with Wrapper {
+  XEWrapper.created() : super.created();
+
+  int get y => new JsObject.fromBrowserObject(this)['y'];
+}