delete observe from the repo

pkg/observe/test/list_path_observer_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:observe/observe.dart';
-import 'package:unittest/unittest.dart';
-import 'observe_test_utils.dart';
-
-main() => dirtyCheckZone().run(_runTests);
-
-_runTests() {
-  var list;
-  var obs;
-  var o1, o2, o3;
-  var sub;
-  int changes;
-
-  setUp(() {
-    list = toObservable([
-      o1 = new TestModel()..a = (new TestModel()..b = 1),
-      o2 = new TestModel()..a = (new TestModel()..b = 2),
-      o3 = new TestModel()..a = (new TestModel()..b = 3)]);
-    obs = new ListPathObserver(list, 'a.b');
-    changes = 0;
-    sub = obs.changes.listen((e) { changes++; });
-  });
-
-  tearDown(() {
-    sub.cancel();
-    list = obs = o1 = o2 = o3 = null;
-  });
-
-  test('list path observer noticed length changes', () {
-    expect(o2.a.b, 2);
-    expect(list[1].a.b, 2);
-    return _nextMicrotask(null).then((_) {
-      expect(changes, 0);
-      list.removeAt(1);
-    }).then(_nextMicrotask).then((_) {
-      expect(changes, 1);
-      expect(list[1].a.b, 3);
-    });
-  });
-
-  test('list path observer delivers deep change', () {
-    expect(o2.a.b, 2);
-    expect(list[1].a.b, 2);
-    int changes = 0;
-    obs.changes.listen((e) { changes++; });
-    return _nextMicrotask(null).then((_) {
-      expect(changes, 0);
-      o2.a.b = 4;
-    }).then(_nextMicrotask).then((_) {
-      expect(changes, 1);
-      expect(list[1].a.b, 4);
-      o1.a = new TestModel()..b = 5;
-    }).then(_nextMicrotask).then((_) {
-      expect(changes, 2);
-      expect(list[0].a.b, 5);
-    });
-  });
-}
-
-_nextMicrotask(_) => new Future(() {});
-
-@reflectable
-class TestModel extends ChangeNotifier {
-  var _a, _b;
-  TestModel();
-
-  get a => _a;
-  void set a(newValue) { _a = notifyPropertyChange(#a, _a, newValue); }
-
-  get b => _b;
-  void set b(newValue) { _b = notifyPropertyChange(#b, _b, newValue); }
-}