| // 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 'dart:collection'; |
| |
| import 'package:collection/collection.dart'; |
| import 'package:test/test.dart'; |
| |
| import '../unmodifiable_collection_test.dart' as common; |
| |
| void main() { |
| var map1 = const {1: 1, 2: 2, 3: 3}; |
| var map2 = const {4: 4, 5: 5, 6: 6}; |
| var map3 = const {7: 7, 8: 8, 9: 9}; |
| var map4 = const {1: -1, 2: -2, 3: -3}; |
| var concat = SplayTreeMap<int, int>() |
| // The duplicates map appears first here but last in the CombinedMapView |
| // which has the opposite semantics of `concat`. Keys/values should be |
| // returned from the first map that contains them. |
| ..addAll(map4) |
| ..addAll(map1) |
| ..addAll(map2) |
| ..addAll(map3); |
| |
| // In every way possible this should test the same as an UnmodifiableMapView. |
| common.testReadMap( |
| concat, CombinedMapView([map1, map2, map3, map4]), 'CombinedMapView'); |
| |
| common.testReadMap( |
| concat, |
| CombinedMapView([map1, {}, map2, {}, map3, {}, map4, {}]), |
| 'CombinedMapView (some empty)'); |
| |
| test('should function as an empty map when no maps are passed', () { |
| var empty = CombinedMapView([]); |
| expect(empty, isEmpty); |
| expect(empty.length, 0); |
| }); |
| |
| test('should function as an empty map when only empty maps are passed', () { |
| var empty = CombinedMapView([{}, {}, {}]); |
| expect(empty, isEmpty); |
| expect(empty.length, 0); |
| }); |
| |
| test('should reflect underlying changes back to the combined map', () { |
| var backing1 = <int, int>{}; |
| var backing2 = <int, int>{}; |
| var combined = CombinedMapView([backing1, backing2]); |
| expect(combined, isEmpty); |
| backing1.addAll(map1); |
| expect(combined, map1); |
| backing2.addAll(map2); |
| expect(combined, Map.from(backing1)..addAll(backing2)); |
| }); |
| |
| test('should reflect underlying changes with a single map', () { |
| var backing1 = <int, int>{}; |
| var combined = CombinedMapView([backing1]); |
| expect(combined, isEmpty); |
| backing1.addAll(map1); |
| expect(combined, map1); |
| }); |
| |
| test('re-iterating keys produces same result', () { |
| var combined = CombinedMapView([map1, map2, map3, map4]); |
| var keys = combined.keys; |
| expect(keys.toList(), keys.toList()); |
| }); |
| } |