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packages/polymer_expressions/test/bindings_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 bindings_test;
+
+import 'dart:async';
+import 'dart:html';
+
+import 'package:observe/observe.dart';
+import 'package:observe/mirrors_used.dart'; // make test smaller.
+import 'package:observe/src/dirty_check.dart' show dirtyCheckZone;
+import 'package:polymer_expressions/polymer_expressions.dart';
+import 'package:smoke/mirrors.dart' as smoke;
+import 'package:template_binding/template_binding.dart' show
+    TemplateBindExtension, templateBind;
+import 'package:unittest/html_config.dart';
+
+import 'package:unittest/unittest.dart';
+
+var testDiv;
+
+main() => dirtyCheckZone().run(() {
+  useHtmlConfiguration();
+  smoke.useMirrors();
+
+  group('bindings', () {
+    var stop = null;
+    setUp(() {
+      document.body.append(testDiv = new DivElement());
+    });
+
+    tearDown(() {
+      testDiv.remove();
+      testDiv = null;
+    });
+
+    test('should update binding when data changes', () {
+      var model = new NotifyModel();
+      var binding = new PolymerExpressions()
+          .prepareBinding('x', null, null)(model, null, false);
+      expect(binding.value, isNull);
+      model.x = "hi";
+      return new Future(() {
+        expect(binding.value, 'hi');
+      });
+    });
+
+    // regression test for issue 19296
+    test('should not throw when data changes', () {
+      var model = new NotifyModel();
+      testDiv.append(_createTemplateInstance(
+          '<template repeat="{{ i in x }}">{{ i }}</template>', model));
+
+      return new Future(() {
+        model.x = [1, 2, 3];
+      }).then(_nextMicrotask).then((_) {
+        expect(testDiv.text,'123');
+      });
+    });
+
+
+    test('should update text content when data changes', () {
+      var model = new NotifyModel('abcde');
+      testDiv.append(_createTemplateInstance('<span>{{x}}</span>', model));
+
+      var el;
+      return new Future(() {
+        el = testDiv.query("span");
+        expect(el.text, 'abcde');
+        expect(model.x, 'abcde');
+        model.x = '___';
+      }).then(_nextMicrotask).then((_) {
+        expect(model.x, '___');
+        expect(el.text, '___');
+      });
+    });
+
+    test('should log eval exceptions', () {
+      var model = new NotifyModel('abcde');
+      var completer = new Completer();
+      runZoned(() {
+        testDiv.append(_createTemplateInstance('<span>{{foo}}</span>', model));
+        return _nextMicrotask(null);
+      }, onError: (e) {
+        expect('$e', startsWith("Error evaluating expression 'foo':"));
+        completer.complete(true);
+      });
+      return completer.future;
+    });
+
+    test('detects changes to ObservableList', () {
+      var list = new ObservableList.from([1, 2, 3]);
+      var model = new NotifyModel(list);
+      testDiv.append(_createTemplateInstance('{{x[1]}}', model));
+
+      return new Future(() {
+        expect(testDiv.text, '2');
+        list[1] = 10;
+      }).then(_nextMicrotask).then((_) {
+        expect(testDiv.text, '10');
+        list[1] = 11;
+      }).then(_nextMicrotask).then((_) {
+        expect(testDiv.text, '11');
+        list[0] = 9;
+      }).then(_nextMicrotask).then((_) {
+        expect(testDiv.text, '11');
+        list.removeAt(0);
+      }).then(_nextMicrotask).then((_) {
+        expect(testDiv.text, '3');
+        list.add(90);
+        list.removeAt(0);
+      }).then(_nextMicrotask).then((_) {
+        expect(testDiv.text, '90');
+      });
+    });
+
+    // Regression tests for issue 18792.
+    for (var usePolymer in [true, false]) {
+      // We run these tests both with PolymerExpressions and with the default
+      // delegate to ensure the results are consistent. When possible, the
+      // expressions on these tests use syntax common to both delegates.
+      var name = usePolymer ? 'polymer-expressions' : 'default';
+      group('$name delegate', () {
+        // Use <option template repeat="{{y}}" value="{{}}">item {{}}
+        _initialSelectTest('{{y}}', '{{}}', usePolymer);
+        _updateSelectTest('{{y}}', '{{}}', usePolymer);
+        _detectKeyValueChanges(usePolymer);
+        if (usePolymer) _detectKeyValueChangesPolymerSyntax();
+        _cursorPositionTest(usePolymer);
+      });
+    }
+
+    group('polymer-expressions delegate, polymer syntax', () {
+        // Use <option template repeat="{{i in y}}" value="{{i}}">item {{i}}
+      _initialSelectTest('{{i in y}}', '{{i}}', true);
+      _updateSelectTest('{{i in y}}', '{{i}}', true);
+    });
+  });
+});
+
+
+_cursorPositionTest(bool usePolymer) {
+  test('should preserve the cursor position', () {
+    var model = new NotifyModel('abcde');
+    testDiv.append(_createTemplateInstance(
+        '<input id="i1" value={{x}}>', model, usePolymer: usePolymer));
+    var el;
+    return new Future(() {
+      el = testDiv.query("#i1");
+      var subscription = el.onInput.listen(expectAsync((_) {}, count: 1));
+      el.focus();
+
+      expect(el.value, 'abcde');
+      expect(model.x, 'abcde');
+
+      el.selectionStart = 3;
+      el.selectionEnd = 3;
+      expect(el.selectionStart, 3);
+      expect(el.selectionEnd, 3);
+
+      el.value = 'abc de';
+      // Updating the input value programmatically (even to the same value in
+      // Chrome) loses the selection position.
+      expect(el.selectionStart, 6);
+      expect(el.selectionEnd, 6);
+
+      el.selectionStart = 4;
+      el.selectionEnd = 4;
+
+      expect(model.x, 'abcde');
+      el.dispatchEvent(new Event('input'));
+      expect(model.x, 'abc de');
+      expect(el.value, 'abc de');
+
+      // But propagating observable values through reassign the value and
+      // selection will be preserved.
+      expect(el.selectionStart, 4);
+      expect(el.selectionEnd, 4);
+      subscription.cancel();
+    }).then(_nextMicrotask).then((_) {
+      // Nothing changes on the next micro task.
+      expect(el.selectionStart, 4);
+      expect(el.selectionEnd, 4);
+    }).then((_) => window.animationFrame).then((_) {
+      // ... or on the next animation frame.
+      expect(el.selectionStart, 4);
+      expect(el.selectionEnd, 4);
+    }).then(_afterTimeout).then((_) {
+      // ... or later.
+      expect(el.selectionStart, 4);
+      expect(el.selectionEnd, 4);
+    });
+  });
+}
+
+_initialSelectTest(String repeatExp, String valueExp, bool usePolymer) {
+  test('initial select value is set correctly', () {
+    var list = const ['a', 'b'];
+    var model = new NotifyModel('b', list);
+    testDiv.append(_createTemplateInstance('<select value="{{x}}">'
+        '<option template repeat="$repeatExp" value="$valueExp">item $valueExp'
+        '</option></select>',
+        model, usePolymer: usePolymer));
+
+    expect(testDiv.querySelector('select').value, 'b');
+    return new Future(() {
+      expect(model.x, 'b');
+      expect(testDiv.querySelector('select').value, 'b');
+    });
+  });
+}
+
+_updateSelectTest(String repeatExp, String valueExp, bool usePolymer) {
+  test('updates to select value propagate correctly', () {
+    var list = const ['a', 'b'];
+    var model = new NotifyModel('a', list);
+
+    testDiv.append(_createTemplateInstance('<select value="{{x}}">'
+        '<option template repeat="$repeatExp" value="$valueExp">item $valueExp'
+        '</option></select></template>', model, usePolymer: usePolymer));
+
+    expect(testDiv.querySelector('select').value, 'a');
+    return new Future(() {
+      expect(testDiv.querySelector('select').value, 'a');
+      model.x = 'b';
+    }).then(_nextMicrotask).then((_) {
+      expect(testDiv.querySelector('select').value, 'b');
+    });
+  });
+}
+
+_detectKeyValueChanges(bool usePolymer) {
+  test('detects changes to ObservableMap keys', () {
+    var map = new ObservableMap.from({'a': 1, 'b': 2});
+    var model = new NotifyModel(map);
+    testDiv.append(_createTemplateInstance(
+        '<template repeat="{{x.keys}}">{{}},</template>',
+        model, usePolymer: usePolymer));
+
+    return new Future(() {
+      expect(testDiv.text, 'a,b,');
+      map.remove('b');
+      map['c'] = 3;
+    }).then(_nextMicrotask).then((_) {
+      expect(testDiv.text, 'a,c,');
+      map['a'] = 4;
+    }).then(_nextMicrotask).then((_) {
+      expect(testDiv.text, 'a,c,');
+    });
+  });
+}
+
+// This test uses 'in', which is a polymer_expressions only feature.
+_detectKeyValueChangesPolymerSyntax() {
+  test('detects changes to ObservableMap values', () {
+    var map = new ObservableMap.from({'a': 1, 'b': 2});
+    var model = new NotifyModel(map);
+    testDiv.append(_createTemplateInstance(
+        '<template repeat="{{k in  x.keys}}">{{x[k]}},</template>', model));
+
+    return new Future(() {
+      expect(testDiv.text, '1,2,');
+      map.remove('b');
+      map['c'] = 3;
+    }).then(_nextMicrotask).then((_) {
+      expect(testDiv.text, '1,3,');
+      map['a'] = 4;
+    }).then(_nextMicrotask).then((_) {
+      expect(testDiv.text, '4,3,');
+    });
+  });
+}
+
+_createTemplateInstance(String templateBody, model, {bool usePolymer: true}) {
+  var tag = new Element.html('<template>$templateBody</template>',
+        treeSanitizer: _nullTreeSanitizer);
+  TemplateBindExtension.bootstrap(tag);
+  var template = templateBind(tag);
+  var delegate = usePolymer ? new PolymerExpressions() : null;
+  return template.createInstance(model, delegate);
+}
+
+_nextMicrotask(_) => new Future(() {});
+_afterTimeout(_) => new Future.delayed(new Duration(milliseconds: 30), () {});
+
+@reflectable
+class NotifyModel extends ChangeNotifier {
+  var _x;
+  var _y;
+  NotifyModel([this._x, this._y]);
+
+  get x => _x;
+  set x(value) {
+    _x = notifyPropertyChange(#x, _x, value);
+  }
+
+  get y => _y;
+  set y(value) {
+    _y = notifyPropertyChange(#y, _y, value);
+  }
+}
+
+class _NullTreeSanitizer implements NodeTreeSanitizer {
+  void sanitizeTree(Node node) {}
+}
+final _nullTreeSanitizer = new _NullTreeSanitizer();