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packages/polymer/test/prop_attr_reflection_test.dart

+// Copyright (c) 2014, 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.
+
+import 'dart:async';
+import 'dart:html';
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+import 'package:polymer/polymer.dart';
+
+class XAttrPublish extends PolymerElement {
+  XAttrPublish.created() : super.created();
+
+  @PublishedProperty(reflect: false)
+  String nog = '';
+}
+
+class XFoo extends PolymerElement {
+  XFoo.created() : super.created();
+
+  @PublishedProperty(reflect: true) var foo = '';
+  @PublishedProperty(reflect: true) String baz = '';
+
+  @PublishedProperty(reflect: true) var def1, def2;
+}
+
+class XBar extends XFoo {
+  XBar.created() : super.created();
+
+  @PublishedProperty(reflect: true) int zot = 3;
+  @PublishedProperty(reflect: true) bool zim = false;
+  @PublishedProperty(reflect: true) String str = 'str';
+  @PublishedProperty(reflect: true) Object obj;
+}
+
+class XZot extends XBar {
+  // Dart note: trying to make this roughly equivalent to the JS
+  @PublishedProperty(reflect: false) int get zot => super.zot;
+  @PublishedProperty(reflect: false) set zot(int x) {
+    super.zot = x;
+  }
+
+  XZot.created() : super.created() {
+    zot = 2;
+    str = 'str2';
+  }
+}
+
+class XCompose extends PolymerElement {
+  XCompose.created() : super.created();
+
+  @observable bool zim = false;
+}
+
+Future onAttributeChange(Element node) {
+  var completer = new Completer();
+  new MutationObserver((records, observer) {
+    observer.disconnect();
+    completer.complete();
+  })..observe(node, attributes: true);
+  scheduleMicrotask(Observable.dirtyCheck);
+  return completer.future;
+}
+
+main() => initPolymer().then((zone) => zone.run(() {
+  useHtmlConfiguration();
+
+  // Most tests use @CustomTag, here we test out the impertive register:
+  Polymer.register('x-foo', XFoo);
+  Polymer.register('x-bar', XBar);
+  Polymer.register('x-zot', XZot);
+  Polymer.register('x-compose', XCompose);
+  Polymer.register('x-attr-publish', XAttrPublish);
+
+  setUp(() => Polymer.onReady);
+
+  test('property to attribute reflection', () {
+    var xbasic = querySelector('x-basic');
+    expect(xbasic.getAttribute('nog'), null,
+        reason: 'property published with `attributes` has correct initial '
+        'value');
+    xbasic.setAttribute('nog', 'hi');
+    expect(xbasic.getAttribute('nog'), 'hi',
+        reason: 'deserialization of property published via `attributes`');
+
+    var xattrpublish = querySelector('x-attr-publish');
+    expect(xattrpublish.nog, '',
+        reason: 'property published with `attributes` has correct initial '
+        'value');
+    xattrpublish.setAttribute('nog', 'hi');
+    expect(xattrpublish.nog, 'hi',
+        reason: 'deserialization of property published via `attributes`');
+
+    var xcompose = querySelector('x-compose');
+    var xfoo = querySelector('x-foo');
+    expect(xfoo.foo, '',
+        reason: 'property published with info object has correct initial '
+        'value');
+    var xbar = querySelector('x-bar');
+    expect(xbar.zim, false,
+        reason: 'property published with info object has correct initial '
+        'value');
+    expect(xbar.foo, '',
+        reason: 'property published with info object has correct initial '
+        'value');
+    var xzot = querySelector('x-zot');
+    xfoo.foo = 5;
+    xfoo.attributes['def1'] = '15';
+    xfoo.def2 = 15;
+
+    // Dart note: our test here is more async than JS until we change
+    // Polymer.dart bindings to work like observe.js "bindToInstance".
+    return onAttributeChange(xfoo).then((_) {
+      expect(xcompose.$['bar'].attributes.containsKey('zim'), false,
+          reason: 'attribute bound to property updates when binding is made');
+
+      expect(xfoo.attributes['def2'], '15',
+          reason: 'default valued published property reflects to attr');
+
+      expect(xfoo.def1, 15,
+          reason: 'attr updates default valued published property');
+
+      expect('${xfoo.foo}', xfoo.attributes['foo'],
+          reason: 'attribute reflects property as string');
+      xfoo.attributes['foo'] = '27';
+      // TODO(jmesserly): why is JS leaving this as a String? From the code it
+      // looks like it should use the type of 5 and parse it as a number.
+      expect('${xfoo.foo}', xfoo.attributes['foo'],
+          reason: 'property reflects attribute');
+      //
+      xfoo.baz = 'Hello';
+    }).then((_) => onAttributeChange(xfoo)).then((_) {
+      expect(xfoo.baz, xfoo.attributes['baz'],
+          reason: 'attribute reflects property');
+      //
+      xbar.foo = 'foo!';
+      xbar.zot = 27;
+      xbar.zim = true;
+      xbar.str = 'str!';
+      xbar.obj = {'hello': 'world'};
+    }).then((_) => onAttributeChange(xbar)).then((_) {
+      expect(xbar.foo, xbar.attributes['foo'],
+          reason: 'inherited published property is reflected');
+      expect('${xbar.zot}', xbar.attributes['zot'],
+          reason: 'attribute reflects property as number');
+      expect(xbar.attributes['zim'], '',
+          reason: 'attribute reflects true valued boolean property as '
+          'having attribute');
+      expect(xbar.str, xbar.attributes['str'],
+          reason: 'attribute reflects property as published string');
+      expect(xbar.attributes.containsKey('obj'), false,
+          reason: 'attribute does not reflect object property');
+      xbar.attributes['zim'] = 'false';
+      xbar.attributes['foo'] = 'foo!!';
+      xbar.attributes['zot'] = '54';
+      xbar.attributes['str'] = 'str!!';
+      xbar.attributes['obj'] = "{'hello': 'world'}";
+      expect(xbar.foo, xbar.attributes['foo'],
+          reason: 'property reflects attribute as string');
+      expect(xbar.zot, 54, reason: 'property reflects attribute as number');
+      expect(xbar.zim, false, reason: 'property reflects attribute as boolean');
+      expect(xbar.str, 'str!!',
+          reason: 'property reflects attribute as published string');
+      expect(xbar.obj, {'hello': 'world'},
+          reason: 'property reflects attribute as object');
+      xbar.zim = false;
+    }).then((_) => onAttributeChange(xbar)).then((_) {
+      expect(xbar.attributes.containsKey('zim'), false,
+          reason: 'attribute reflects false valued boolean property as NOT '
+          'having attribute');
+      xbar.obj = 'hi';
+    }).then((_) => onAttributeChange(xbar)).then((_) {
+      expect(xbar.attributes['obj'], 'hi',
+          reason: 'reflect property based on current type');
+
+      expect(xzot.str, 'str2');
+      expect(xzot.zot, 2);
+      xzot.str = 'hello';
+      xzot.zot = 5;
+    }).then((_) => onAttributeChange(xzot)).then((_) {
+      expect(xzot.attributes['str'], xzot.str);
+      // TODO(jmesserly): the JS test seems backwards of the description text.
+      // Is it because it doesn't do "WebComponents.flush()"?
+      expect(xzot.attributes['zot'], '5',
+          reason: 'extendee reflect false not honored');
+    });
+  });
+}));