Implement Model-Driven-Views spec for Dart

tests/lib/observe/observe_path_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 '../../../pkg/unittest/lib/unittest.dart';
+import '../../../sdk/lib/observe/observe.dart';
+
+// This file contains code ported from:
+// https://github.com/rafaelw/ChangeSummary/blob/master/tests/test.js
+
+main() {
+  group('observePath', observePathTests);
+}
+
+observePathTests() {
+
+  test('Degenerate Values', () {
+    expect(observePath(null, '').value, null);
+    expect(observePath(123, '').value, 123);
+    expect(observePath(123, 'foo.bar.baz').value, null);
+
+    // shouldn't throw:
+    observePath(123, '').values.listen(() {}).cancel();
+    observePath(null, '').value = null;
+    observePath(123, '').value = 42;
+    observePath(123, 'foo.bar.baz').value = 42;
+
+    var foo = {};
+    expect(observePath(foo, '').value, foo);
+
+    foo = new Object();
+    expect(observePath(foo, '').value, foo);
+
+    expect(observePath(foo, 'a/3!'), null);
+  });
+
+  test('get value at path ObservableBox', () {
+    var obj = new ObservableBox(new ObservableBox(new ObservableBox(1)));
+
+    expect(observePath(obj, '').value, obj);
+    expect(observePath(obj, 'value').value, obj.value);
+    expect(observePath(obj, 'value.value').value, obj.value.value);
+    expect(observePath(obj, 'value.value.value').value, 1);
+
+    obj.value.value.value = 2;
+    expect(observePath(obj, 'value.value.value').value, 2);
+
+    obj.value.value = new ObservableBox(3);
+    expect(observePath(obj, 'value.value.value').value, 3);
+
+    obj.value = new ObservableBox(4);
+    expect(observePath(obj, 'value.value.value').value, null);
+    expect(observePath(obj, 'value.value').value, 4);
+  });
+
+
+  test('get value at path ObservableMap', () {
+    var obj = toObservable({'a': {'b': {'c': 1}}});
+
+    expect(observePath(obj, '').value, obj);
+    expect(observePath(obj, 'a').value, obj['a']);
+    expect(observePath(obj, 'a.b').value, obj['a']['b']);
+    expect(observePath(obj, 'a.b.c').value, 1);
+
+    obj['a']['b']['c'] = 2;
+    expect(observePath(obj, 'a.b.c').value, 2);
+
+    obj['a']['b'] = toObservable({'c': 3});
+    expect(observePath(obj, 'a.b.c').value, 3);
+
+    obj['a'] = toObservable({'b': 4});
+    expect(observePath(obj, 'a.b.c').value, null);
+    expect(observePath(obj, 'a.b').value, 4);
+  });
+
+  test('set value at path', () {
+    var obj = toObservable({});
+    observePath(obj, 'foo').value = 3;
+    expect(obj['foo'], 3);
+
+    var bar = toObservable({ 'baz': 3 });
+    observePath(obj, 'bar').value = bar;
+    expect(obj['bar'], bar);
+
+    observePath(obj, 'bar.baz.bat').value = 'not here';
+    expect(observePath(obj, 'bar.baz.bat').value, null);
+  });
+
+  test('set value back to same', () {
+    var obj = toObservable({});
+    var path = observePath(obj, 'foo');
+    var values = [];
+    path.values.listen((v) { values.add(v); });
+
+    path.value = 3;
+    expect(obj['foo'], 3);
+    expect(path.value, 3);
+
+    observePath(obj, 'foo').value = 2;
+    deliverChangeRecords();
+    expect(path.value, 2);
+    expect(observePath(obj, 'foo').value, 2);
+
+    observePath(obj, 'foo').value = 3;
+    deliverChangeRecords();
+    expect(path.value, 3);
+
+    deliverChangeRecords();
+    expect(values, [3]);
+  });
+
+  test('Observe and Unobserve - Paths', () {
+    var arr = toObservable({});
+
+    arr['foo'] = 'bar';
+    var fooValues = [];
+    var fooPath = observePath(arr, 'foo');
+    var fooSub = fooPath.values.listen((v) {
+      fooValues.add(v);
+    });
+    arr['foo'] = 'baz';
+    arr['bat'] = 'bag';
+    var batValues = [];
+    var batPath = observePath(arr, 'bat');
+    var batSub = batPath.values.listen((v) {
+      batValues.add(v);
+    });
+
+    deliverChangeRecords();
+    expect(fooValues, ['baz']);
+    expect(batValues, []);
+
+    arr['foo'] = 'bar';
+    fooSub.cancel();
+    arr['bat'] = 'boo';
+    batSub.cancel();
+    arr['bat'] = 'boot';
+
+    deliverChangeRecords();
+    expect(fooValues, ['baz']);
+    expect(batValues, []);
+  });
+
+  test('Path Value With Indices', () {
+    var model = toObservable([]);
+    observePath(model, '0').values.listen(expectAsync1((v) {
+      expect(v, 123);
+    }));
+    model.add(123);
+  });
+
+  solo_test('Path Observation', () {
+    var model = new TestModel('a', new TestModel('b',
+        new TestModel('c', 'hello, world')));
+
+    var path = observePath(model, 'a.b.c');
+    var lastValue = null;
+    var sub = path.values.listen((v) { lastValue = v; });
+
+    model.value.value.value = 'hello, mom';
+
+    expect(lastValue, null);
+    deliverChangeRecords();
+    expect(lastValue, 'hello, mom');
+
+    model.value.value = new TestModel('c', 'hello, dad');
+    deliverChangeRecords();
+    expect(lastValue, 'hello, dad');
+
+    model.value = new TestModel('b', new TestModel('c', 'hello, you'));
+    deliverChangeRecords();
+    expect(lastValue, 'hello, you');
+
+    model.value.value = 1;
+    deliverChangeRecords();
+    expect(lastValue, null);
+
+    // Stop observing
+    sub.cancel();
+
+    model.value.value = new TestModel('c',
+        'hello, back again -- but not observing');
+    deliverChangeRecords();
+    expect(lastValue, null);
+
+    // Resume observing
+    sub = path.values.listen((v) { lastValue = v; });
+
+    model.value.value.value = 'hello. Back for reals';
+    deliverChangeRecords();
+    expect(lastValue, 'hello. Back for reals');
+  });
+
+  test('observe map', () {
+    var model = toObservable({'a': 1});
+    var path = observePath(model, 'a');
+
+    values = [path.value];
+    var sub = path.values.listen((v) { values.add(v); });
+    expect(values, [1]);
+
+    model['a'] = 2;
+    deliverChangeRecords();
+    expect(values, [1, 2]);
+
+    sub.cancel();
+    model['a'] = 3;
+    deliverChangeRecords();
+    expect(values, [1, 2]);
+  });
+}
+
+class TestModel extends ObservableMixin {
+  final String fieldName;
+  var _value;
+
+  TestModel(this.fieldName, [initialValue]) : _value = initialValue;
+
+  get value => _value;
+
+  void set value(newValue) {
+    if (hasObservers) {
+      notifyChange(fieldName, _value, newValue);
+    }
+    _value = newValue;
+  }
+
+  getValue(key) {
+    if (key == fieldName) return value;
+    return null;
+  }
+  void setValue(key, newValue) {
+    if (key == fieldName) value = newValue;
+  }
+
+  toString() => '#<$runtimeType $fieldName: $_value>';
+}
+
+_record(key, oldValue, newValue, [kind = ChangeRecord.FIELD]) =>
+    new ChangeRecord(key, oldValue, newValue, kind: kind);