| // Copyright (c) 2017, 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 'package:collection/collection.dart'; |
| import 'package:test/test.dart'; |
| |
| import '../unmodifiable_collection_test.dart' as common; |
| |
| void main() { |
| var list1 = [1, 2, 3]; |
| var list2 = [4, 5, 6]; |
| var list3 = [7, 8, 9]; |
| var concat = <int>[]..addAll(list1)..addAll(list2)..addAll(list3); |
| |
| // In every way possible this should test the same as an UnmodifiableListView. |
| common.testUnmodifiableList( |
| concat, CombinedListView([list1, list2, list3]), 'combineLists'); |
| |
| common.testUnmodifiableList(concat, |
| CombinedListView([list1, [], list2, [], list3, []]), 'combineLists'); |
| |
| test('should function as an empty list when no lists are passed', () { |
| var empty = CombinedListView([]); |
| expect(empty, isEmpty); |
| expect(empty.length, 0); |
| expect(() => empty[0], throwsRangeError); |
| }); |
| |
| test('should function as an empty list when only empty lists are passed', () { |
| var empty = CombinedListView([[], [], []]); |
| expect(empty, isEmpty); |
| expect(empty.length, 0); |
| expect(() => empty[0], throwsRangeError); |
| }); |
| |
| test('should reflect underlying changes back to the combined list', () { |
| var backing1 = <int>[]; |
| var backing2 = <int>[]; |
| var combined = CombinedListView([backing1, backing2]); |
| expect(combined, isEmpty); |
| backing1.addAll(list1); |
| expect(combined, list1); |
| backing2.addAll(list2); |
| expect(combined, backing1.toList()..addAll(backing2)); |
| }); |
| |
| test('should reflect underlying changes from the list of lists', () { |
| var listOfLists = <List<int>>[]; |
| var combined = CombinedListView(listOfLists); |
| expect(combined, isEmpty); |
| listOfLists.add(list1); |
| expect(combined, list1); |
| listOfLists.add(list2); |
| expect(combined, []..addAll(list1)..addAll(list2)); |
| listOfLists.clear(); |
| expect(combined, isEmpty); |
| }); |
| |
| test('should reflect underlying changes with a single list', () { |
| var backing1 = <int>[]; |
| var combined = CombinedListView([backing1]); |
| expect(combined, isEmpty); |
| backing1.addAll(list1); |
| expect(combined, list1); |
| }); |
| } |