pkg/polymer_expressions/test/syntax_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:logging/logging.dart';
import 'package:observe/observe.dart';
import 'package:polymer_expressions/polymer_expressions.dart';
import 'package:template_binding/template_binding.dart';
import 'package:unittest/html_enhanced_config.dart';
import 'package:unittest/unittest.dart';

main() {
  useHtmlEnhancedConfiguration();

  group('PolymerExpressions', () {
    var testDiv;

    setUp(() {
      document.body.append(testDiv = new DivElement());
    });

    tearDown(() {
      testDiv.firstChild.remove();
      testDiv = null;
    });

    test('should make two-way bindings to inputs', () {
      testDiv.nodes.add(new Element.html('''
          <template id="test" bind>
            <input id="input" value="{{ firstName }}">
          </template>'''));
      var person = new Person('John', 'Messerly', ['A', 'B', 'C']);
      templateBind(query('#test'))
          ..bindingDelegate = new PolymerExpressions()
          ..model = person;
      return new Future.delayed(new Duration()).then((_) {
        InputElement input = query('#input');
        expect(input.value, 'John');
        input.focus();
        input.value = 'Justin';
        input.blur();
        var event = new Event('change');
        // TODO(justin): figure out how to trigger keyboard events to test
        // two-way bindings
      });
    });

    test('should handle null collections in "in" expressions', () {
      testDiv.nodes.add(new Element.html('''
          <template id="test" bind>
            <template repeat="{{ item in items }}">
              {{ item }}
            </template>
          </template>'''));
      templateBind(query('#test')).bindingDelegate =
          new PolymerExpressions(globals: {'items': null});
      // the template should be the only node
      expect(testDiv.nodes.length, 1);
      expect(testDiv.nodes[0].id, 'test');
    });

    test('should silently handle bad variable names', () {
      var logger = new Logger('polymer_expressions');
      var logFuture = logger.onRecord.toList();
      testDiv.nodes.add(new Element.html('''
          <template id="test" bind>{{ foo }}</template>'''));
      templateBind(query('#test')).bindingDelegate = new PolymerExpressions();
      return new Future(() {
        logger.clearListeners();
        return logFuture.then((records) {
          expect(records.length, 1);
          expect(records.first.message,
              contains('Error evaluating expression'));
          expect(records.first.message, contains('foo'));
        });
      });
    });
  });
}

@reflectable
class Person extends ChangeNotifier {
  String _firstName;
  String _lastName;
  List<String> _items;

  Person(this._firstName, this._lastName, this._items);

  String get firstName => _firstName;

  void set firstName(String value) {
    _firstName = notifyPropertyChange(#firstName, _firstName, value);
  }

  String get lastName => _lastName;

  void set lastName(String value) {
    _lastName = notifyPropertyChange(#lastName, _lastName, value);
  }

  String getFullName() => '$_firstName $_lastName';

  List<String> get items => _items;

  void set items(List<String> value) {
    _items = notifyPropertyChange(#items, _items, value);
  }

  String toString() => "Person(firstName: $_firstName, lastName: $_lastName)";
}