Update charted to 0.4.8 and roll

packages/observe/test/observe_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 'package:logging/logging.dart';
-import 'package:observe/observe.dart';
-import 'package:observe/src/dirty_check.dart' as dirty_check;
-import 'package:unittest/unittest.dart';
-import 'observe_test_utils.dart';
-
-import 'package:observe/mirrors_used.dart'; // make test smaller.
-import 'package:smoke/mirrors.dart';
-
-main() {
-  useMirrors();
-  dirtyCheckZone().run(_tests);
-}
-
-void _tests() {
-  // Note: to test the basic Observable system, we use ObservableBox due to its
-  // simplicity. We also test a variant that is based on dirty-checking.
-
-  test('no observers at the start', () {
-    expect(dirty_check.allObservablesCount, 0);
-  });
-
-  group('WatcherModel', () => _observeTests((x) => new WatcherModel(x)));
-
-  group('ObservableBox', () => _observeTests((x) => new ObservableBox(x)));
-
-  group('ModelSubclass', () => _observeTests((x) => new ModelSubclass(x)));
-
-  group('dirtyCheck loops can be debugged', () {
-    var messages;
-    var subscription;
-    setUp(() {
-      messages = [];
-      subscription = Logger.root.onRecord.listen((record) {
-        messages.add(record.message);
-      });
-    });
-
-    tearDown(() {
-      subscription.cancel();
-    });
-
-    test('logs debug information', () {
-      var maxNumIterations = dirty_check.MAX_DIRTY_CHECK_CYCLES;
-
-      var x = new WatcherModel(0);
-      var sub = x.changes.listen(expectAsync((_) { x.value++; },
-          count: maxNumIterations));
-      x.value = 1;
-      Observable.dirtyCheck();
-      expect(x.value, maxNumIterations + 1);
-      expect(messages.length, 2);
-
-      expect(messages[0], contains('Possible loop'));
-      expect(messages[1], contains('index 0'));
-      expect(messages[1], contains('object: $x'));
-
-      sub.cancel();
-    });
-  });
-}
-
-void _observeTests(createModel(x)) {
-  final watch = createModel(null) is! ChangeNotifier;
-
-  // Track the subscriptions so we can clean them up in tearDown.
-  List subs;
-
-  int initialObservers;
-  setUp(() {
-    initialObservers = dirty_check.allObservablesCount;
-    subs = [];
-
-    if (watch) scheduleMicrotask(Observable.dirtyCheck);
-  });
-
-  tearDown(() {
-    for (var sub in subs) sub.cancel();
-    return new Future(() {
-      expect(dirty_check.allObservablesCount, initialObservers,
-          reason: 'Observable object leaked');
-    });
-  });
-
-  test('handle future result', () {
-    var callback = expectAsync((){});
-    return new Future(callback);
-  });
-
-  test('no observers', () {
-    var t = createModel(123);
-    expect(t.value, 123);
-    t.value = 42;
-    expect(t.value, 42);
-    expect(t.hasObservers, false);
-  });
-
-  test('listen adds an observer', () {
-    var t = createModel(123);
-    expect(t.hasObservers, false);
-
-    subs.add(t.changes.listen((n) {}));
-    expect(t.hasObservers, true);
-  });
-
-  test('changes delived async', () {
-    var t = createModel(123);
-    int called = 0;
-
-    subs.add(t.changes.listen(expectAsync((records) {
-      called++;
-      expectPropertyChanges(records, watch ? 1 : 2);
-    })));
-
-    t.value = 41;
-    t.value = 42;
-    expect(called, 0);
-  });
-
-  test('cause changes in handler', () {
-    var t = createModel(123);
-    int called = 0;
-
-    subs.add(t.changes.listen(expectAsync((records) {
-      called++;
-      expectPropertyChanges(records, 1);
-      if (called == 1) {
-        // Cause another change
-        t.value = 777;
-      }
-    }, count: 2)));
-
-    t.value = 42;
-  });
-
-  test('multiple observers', () {
-    var t = createModel(123);
-
-    verifyRecords(records) {
-      expectPropertyChanges(records, watch ? 1 : 2);
-    };
-
-    subs.add(t.changes.listen(expectAsync(verifyRecords)));
-    subs.add(t.changes.listen(expectAsync(verifyRecords)));
-
-    t.value = 41;
-    t.value = 42;
-  });
-
-  test('async processing model', () {
-    var t = createModel(123);
-    var records = [];
-    subs.add(t.changes.listen((r) { records.addAll(r); }));
-    t.value = 41;
-    t.value = 42;
-    expectChanges(records, [], reason: 'changes delived async');
-
-    return new Future(() {
-      expectPropertyChanges(records, watch ? 1 : 2);
-      records.clear();
-
-      t.value = 777;
-      expectChanges(records, [], reason: 'changes delived async');
-
-    }).then(newMicrotask).then((_) {
-      expectPropertyChanges(records, 1);
-
-      // Has no effect if there are no changes
-      Observable.dirtyCheck();
-      expectPropertyChanges(records, 1);
-    });
-  });
-
-  test('cancel listening', () {
-    var t = createModel(123);
-    var sub;
-    sub = t.changes.listen(expectAsync((records) {
-      expectPropertyChanges(records, 1);
-      sub.cancel();
-      t.value = 777;
-      scheduleMicrotask(Observable.dirtyCheck);
-    }));
-    t.value = 42;
-  });
-
-  test('cancel and reobserve', () {
-    var t = createModel(123);
-    var sub;
-    sub = t.changes.listen(expectAsync((records) {
-      expectPropertyChanges(records, 1);
-      sub.cancel();
-
-      scheduleMicrotask(expectAsync(() {
-        subs.add(t.changes.listen(expectAsync((records) {
-          expectPropertyChanges(records, 1);
-        })));
-        t.value = 777;
-        scheduleMicrotask(Observable.dirtyCheck);
-      }));
-    }));
-    t.value = 42;
-  });
-
-  test('cannot modify changes list', () {
-    var t = createModel(123);
-    var records = null;
-    subs.add(t.changes.listen((r) { records = r; }));
-    t.value = 42;
-
-    return new Future(() {
-      expectPropertyChanges(records, 1);
-
-      // Verify that mutation operations on the list fail:
-
-      expect(() {
-        records[0] = new PropertyChangeRecord(t, #value, 0, 1);
-      }, throwsUnsupportedError);
-
-      expect(() { records.clear(); }, throwsUnsupportedError);
-
-      expect(() { records.length = 0; }, throwsUnsupportedError);
-    });
-  });
-
-  test('notifyChange', () {
-    var t = createModel(123);
-    var records = [];
-    subs.add(t.changes.listen((r) { records.addAll(r); }));
-    t.notifyChange(new PropertyChangeRecord(t, #value, 123, 42));
-
-    return new Future(() {
-      expectPropertyChanges(records, 1);
-      expect(t.value, 123, reason: 'value did not actually change.');
-    });
-  });
-
-  test('notifyPropertyChange', () {
-    var t = createModel(123);
-    var records = null;
-    subs.add(t.changes.listen((r) { records = r; }));
-    expect(t.notifyPropertyChange(#value, t.value, 42), 42,
-        reason: 'notifyPropertyChange returns newValue');
-
-    return new Future(() {
-      expectPropertyChanges(records, 1);
-      expect(t.value, 123, reason: 'value did not actually change.');
-    });
-  });
-}
-
-expectPropertyChanges(records, int number) {
-  expect(records.length, number, reason: 'expected $number change records');
-  for (var record in records) {
-    expect(record is PropertyChangeRecord, true, reason:
-        'record should be PropertyChangeRecord');
-    expect((record as PropertyChangeRecord).name, #value, reason:
-        'record should indicate a change to the "value" property');
-  }
-}
-
-// A test model based on dirty checking.
-class WatcherModel<T> extends Observable {
-  @observable T value;
-
-  WatcherModel([T initialValue]) : value = initialValue;
-
-  String toString() => '#<$runtimeType value: $value>';
-}
-
-class ModelSubclass<T> extends WatcherModel<T> {
-  ModelSubclass([T initialValue]) : super(initialValue);
-}