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packages/quiver/test/collection/delegates/set_test.dart

+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+library quiver.collection.delegates.set_test;
+
+import 'dart:collection' show LinkedHashSet;
+
+import 'package:quiver/collection.dart';
+import 'package:test/test.dart';
+
+class MySet extends DelegatingSet<String> {
+  final Set<String> _delegate;
+
+  MySet(this._delegate);
+
+  Set<String> get delegate => _delegate;
+}
+
+void main() {
+  group('DelegatingSet', () {
+    DelegatingSet<String> delegatingSet;
+
+    setUp(() {
+      delegatingSet =
+          new MySet(new LinkedHashSet<String>.from(['a', 'b', 'cc']));
+    });
+
+    test('add', () {
+      delegatingSet.add('d');
+      expect(delegatingSet, equals(['a', 'b', 'cc', 'd']));
+      delegatingSet.add('d');
+      expect(delegatingSet, equals(['a', 'b', 'cc', 'd']));
+    });
+
+    test('addAll', () {
+      delegatingSet.addAll(['d', 'e']);
+      expect(delegatingSet, equals(['a', 'b', 'cc', 'd', 'e']));
+    });
+
+    test('clear', () {
+      delegatingSet.clear();
+      expect(delegatingSet, equals([]));
+    });
+
+    test('containsAll', () {
+      expect(delegatingSet.containsAll(['a', 'cc']), isTrue);
+      expect(delegatingSet.containsAll(['a', 'c']), isFalse);
+    });
+
+    test('difference', () {
+      expect(delegatingSet.difference(new Set<String>.from(['a', 'cc'])),
+          equals(['b']));
+      expect(delegatingSet.difference(new Set<String>.from(['cc'])),
+          equals(['a', 'b']));
+    }, skip: "Test failing: Caught type 'LinkedHashSet<String>' is not a subtype of type 'HashSet<String>' of 'result'.");
+
+    test('intersection', () {
+      expect(delegatingSet.intersection(new Set<String>.from(['a', 'dd'])),
+          equals(['a']));
+      expect(
+          delegatingSet.intersection(new Set<String>.from(['e'])), equals([]));
+    });
+
+    test('remove', () {
+      expect(delegatingSet.remove('b'), isTrue);
+      expect(delegatingSet, equals(['a', 'cc']));
+    });
+
+    test('removeAll', () {
+      delegatingSet.removeAll(['a', 'cc']);
+      expect(delegatingSet, equals(['b']));
+    });
+
+    test('removeWhere', () {
+      delegatingSet.removeWhere((e) => e.length == 1);
+      expect(delegatingSet, equals(['cc']));
+    });
+
+    test('retainAll', () {
+      delegatingSet.retainAll(['a', 'cc', 'd']);
+      expect(delegatingSet, equals(['a', 'cc']));
+    });
+
+    test('retainWhere', () {
+      delegatingSet.retainWhere((e) => e.length == 1);
+      expect(delegatingSet, equals(['a', 'b']));
+    });
+
+    test('union', () {
+      expect(
+          delegatingSet.union(new LinkedHashSet<String>.from(['a', 'cc', 'd'])),
+          equals(['a', 'b', 'cc', 'd']));
+    });
+  });
+}