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packages/observe/test/observable_list_test.dart

Index: packages/observe/test/observable_list_test.dart
diff --git a/packages/observe/test/observable_list_test.dart b/packages/observe/test/observable_list_test.dart
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+++ b/packages/observe/test/observable_list_test.dart
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+// 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() {
+  // TODO(jmesserly): need all standard List API tests.
+
+  StreamSubscription sub, sub2;
+
+  sharedTearDown() {
+    list = null;
+    sub.cancel();
+    if (sub2 != null) {
+      sub2.cancel();
+      sub2 = null;
+    }
+  }
+
+  group('observe length', () {
+
+    ObservableList list;
+    List<ChangeRecord> changes;
+
+    setUp(() {
+      list = toObservable([1, 2, 3]);
+      changes = null;
+      sub = list.changes.listen((records) {
+        changes = getPropertyChangeRecords(records, #length);
+      });
+    });
+
+    tearDown(sharedTearDown);
+
+    test('add changes length', () {
+      list.add(4);
+      expect(list, [1, 2, 3, 4]);
+      return new Future(() {
+        expectChanges(changes, [_lengthChange(3, 4)]);
+      });
+    });
+
+    test('removeObject', () {
+      list.remove(2);
+      expect(list, orderedEquals([1, 3]));
+
+      return new Future(() {
+        expectChanges(changes, [_lengthChange(3, 2)]);
+      });
+    });
+
+    test('removeRange changes length', () {
+      list.add(4);
+      list.removeRange(1, 3);
+      expect(list, [1, 4]);
+      return new Future(() {
+        expectChanges(changes, [_lengthChange(3, 4), _lengthChange(4, 2)]);
+      });
+    });
+
+    test('length= changes length', () {
+      list.length = 5;
+      expect(list, [1, 2, 3, null, null]);
+      return new Future(() {
+        expectChanges(changes, [_lengthChange(3, 5)]);
+      });
+    });
+
+    test('[]= does not change length', () {
+      list[2] = 9000;
+      expect(list, [1, 2, 9000]);
+      return new Future(() {
+        expectChanges(changes, null);
+      });
+    });
+
+    test('clear changes length', () {
+      list.clear();
+      expect(list, []);
+      return new Future(() {
+        expectChanges(changes, [_lengthChange(3, 0)]);
+      });
+    });
+  });
+
+  group('observe index', () {
+    List<ListChangeRecord> changes;
+
+    setUp(() {
+      list = toObservable([1, 2, 3]);
+      changes = null;
+      sub = list.listChanges.listen((records) {
+        changes = getListChangeRecords(records, 1);
+      });
+    });
+
+    tearDown(sharedTearDown);
+
+    test('add does not change existing items', () {
+      list.add(4);
+      expect(list, [1, 2, 3, 4]);
+      return new Future(() {
+        expectChanges(changes, []);
+      });
+    });
+
+    test('[]= changes item', () {
+      list[1] = 777;
+      expect(list, [1, 777, 3]);
+      return new Future(() {
+        expectChanges(changes, [_change(1, addedCount: 1, removed: [2])]);
+      });
+    });
+
+    test('[]= on a different item does not fire change', () {
+      list[2] = 9000;
+      expect(list, [1, 2, 9000]);
+      return new Future(() {
+        expectChanges(changes, []);
+      });
+    });
+
+    test('set multiple times results in one change', () {
+      list[1] = 777;
+      list[1] = 42;
+      expect(list, [1, 42, 3]);
+      return new Future(() {
+        expectChanges(changes, [
+          _change(1, addedCount: 1, removed: [2]),
+        ]);
+      });
+    });
+
+    test('set length without truncating item means no change', () {
+      list.length = 2;
+      expect(list, [1, 2]);
+      return new Future(() {
+        expectChanges(changes, []);
+      });
+    });
+
+    test('truncate removes item', () {
+      list.length = 1;
+      expect(list, [1]);
+      return new Future(() {
+        expectChanges(changes, [_change(1, removed: [2, 3])]);
+      });
+    });
+
+    test('truncate and add new item', () {
+      list.length = 1;
+      list.add(42);
+      expect(list, [1, 42]);
+      return new Future(() {
+        expectChanges(changes, [
+          _change(1, removed: [2, 3], addedCount: 1)
+        ]);
+      });
+    });
+
+    test('truncate and add same item', () {
+      list.length = 1;
+      list.add(2);
+      expect(list, [1, 2]);
+      return new Future(() {
+        expectChanges(changes, []);
+      });
+    });
+  });
+
+  test('toString', () {
+    var list = toObservable([1, 2, 3]);
+    expect(list.toString(), '[1, 2, 3]');
+  });
+
+  group('change records', () {
+
+    List<ChangeRecord> propRecords;
+    List<ListChangeRecord> listRecords;
+
+    setUp(() {
+      list = toObservable([1, 2, 3, 1, 3, 4]);
+      propRecords = null;
+      listRecords = null;
+      sub = list.changes.listen((r) { propRecords = r; });
+      sub2 = list.listChanges.listen((r) { listRecords = r; });
+    });
+
+    tearDown(sharedTearDown);
+
+    test('read operations', () {
+      expect(list.length, 6);
+      expect(list[0], 1);
+      expect(list.indexOf(4), 5);
+      expect(list.indexOf(1), 0);
+      expect(list.indexOf(1, 1), 3);
+      expect(list.lastIndexOf(1), 3);
+      expect(list.last, 4);
+      var copy = new List<int>();
+      list.forEach((i) { copy.add(i); });
+      expect(copy, orderedEquals([1, 2, 3, 1, 3, 4]));
+      return new Future(() {
+        // no change from read-only operators
+        expectChanges(propRecords, null);
+        expectChanges(listRecords, null);
+      });
+    });
+
+    test('add', () {
+      list.add(5);
+      list.add(6);
+      expect(list, orderedEquals([1, 2, 3, 1, 3, 4, 5, 6]));
+
+      return new Future(() {
+        expectChanges(propRecords, [
+          _lengthChange(6, 7),
+          _lengthChange(7, 8),
+        ]);
+        expectChanges(listRecords, [ _change(6, addedCount: 2) ]);
+      });
+    });
+
+    test('[]=', () {
+      list[1] = list.last;
+      expect(list, orderedEquals([1, 4, 3, 1, 3, 4]));
+
+      return new Future(() {
+        expectChanges(propRecords, null);
+        expectChanges(listRecords, [ _change(1, addedCount: 1, removed: [2]) ]);
+      });
+    });
+
+    test('removeLast', () {
+      expect(list.removeLast(), 4);
+      expect(list, orderedEquals([1, 2, 3, 1, 3]));
+
+      return new Future(() {
+        expectChanges(propRecords, [_lengthChange(6, 5)]);
+        expectChanges(listRecords, [_change(5, removed: [4])]);
+      });
+    });
+
+    test('removeRange', () {
+      list.removeRange(1, 4);
+      expect(list, orderedEquals([1, 3, 4]));
+
+      return new Future(() {
+        expectChanges(propRecords, [_lengthChange(6, 3)]);
+        expectChanges(listRecords, [_change(1, removed: [2, 3, 1])]);
+      });
+    });
+
+    test('sort', () {
+      list.sort((x, y) => x - y);
+      expect(list, orderedEquals([1, 1, 2, 3, 3, 4]));
+
+      return new Future(() {
+        expectChanges(propRecords, null);
+        expectChanges(listRecords, [
+          _change(1, addedCount: 1),
+          _change(4, removed: [1])
+        ]);
+      });
+    });
+
+    test('clear', () {
+      list.clear();
+      expect(list, []);
+
+      return new Future(() {
+        expectChanges(propRecords, [
+            _lengthChange(6, 0),
+            new PropertyChangeRecord(list, #isEmpty, false, true),
+            new PropertyChangeRecord(list, #isNotEmpty, true, false),
+        ]);
+        expectChanges(listRecords, [_change(0, removed: [1, 2, 3, 1, 3, 4])]);
+      });
+    });
+  });
+}
+
+ObservableList list;
+
+_lengthChange(int oldValue, int newValue) =>
+    new PropertyChangeRecord(list, #length, oldValue, newValue);
+
+_change(index, {removed: const [], addedCount: 0}) => new ListChangeRecord(
+    list, index, removed: removed, addedCount: addedCount);