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packages/polymer/test/computed_properties_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.
+
+import 'dart:async';
+import 'dart:html';
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+import 'package:polymer/polymer.dart';
+
+// Test ported from:
+// https://github.com/Polymer/polymer-dev/blob/0.3.4/test/html/computedProperties.html
+@CustomTag('x-foo')
+class XFoo extends PolymerElement {
+  XFoo.created() : super.created();
+
+  // Left like this to illustrate the old-style @published pattern next to the
+  // new style below.
+  @published int count;
+
+  @published
+  String get foo => readValue(#foo);
+  set foo(String v) => writeValue(#foo, v);
+
+  @published
+  String get bar => readValue(#bar);
+  set bar(String v) => writeValue(#bar, v);
+
+  @ComputedProperty('repeat(fooBar, count)')
+  String get fooBarCounted => readValue(#fooBarCounted);
+
+  @ComputedProperty('foo + "-" + bar')
+  String get fooBar => readValue(#fooBar);
+
+  @ComputedProperty('this.foo')
+  String get foo2 => readValue(#foo2);
+  set foo2(v) => writeValue(#foo2, v);
+
+  @ComputedProperty('bar + ""')
+  String get bar2 => readValue(#bar2);
+  set bar2(v) => writeValue(#bar2, v);
+
+  repeat(String s, int count) {
+    var sb = new StringBuffer();
+    for (var i = 0; i < count; i++) {
+      if (i > 0) sb.write(' ');
+      sb.write(s);
+      sb.write('($i)');
+    }
+    return sb.toString();
+  }
+}
+
+main() => initPolymer().then((zone) => zone.run(() {
+  useHtmlConfiguration();
+
+  setUp(() => Polymer.onReady);
+
+  test('computed properties basic', () {
+    var xFoo = querySelector('x-foo');
+    var html = xFoo.shadowRoot.innerHtml;
+    expect(html, 'mee-too:mee-too(0) mee-too(1) mee-too(2)');
+    expect(xFoo.fooBar, 'mee-too');
+  });
+
+  // Dart note: the following tests were not in the original JS test.
+  test('computed properties can be updated', () {
+    var xFoo = querySelector('x-foo');
+    expect(xFoo.foo, 'mee');
+    expect(xFoo.foo2, 'mee');
+    xFoo.foo2 = 'hi';
+    expect(xFoo.foo, 'hi');
+    expect(xFoo.foo2, 'hi');
+  });
+
+  test('only assignable expressions can be updated', () {
+    var xFoo = querySelector('x-foo');
+    expect(xFoo.bar, 'too');
+    expect(xFoo.bar2, 'too');
+    xFoo.bar2 = 'hi';
+    expect(xFoo.bar, 'too');
+    expect(xFoo.bar2, 'too');
+  });
+}));