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packages/quiver/test/collection/delegates/queue_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.queue_test;
+
+import 'dart:collection' show Queue;
+
+import 'package:quiver/collection.dart';
+import 'package:test/test.dart';
+
+class MyQueue extends DelegatingQueue<String> {
+  final Queue<String> _delegate;
+
+  MyQueue(this._delegate);
+
+  Queue<String> get delegate => _delegate;
+}
+
+void main() {
+  group('DelegatingQueue', () {
+    DelegatingQueue<String> delegatingQueue;
+
+    setUp(() {
+      delegatingQueue = new MyQueue(new Queue<String>.from(['a', 'b', 'cc']));
+    });
+
+    test('add', () {
+      delegatingQueue.add('d');
+      expect(delegatingQueue, equals(['a', 'b', 'cc', 'd']));
+    });
+
+    test('addAll', () {
+      delegatingQueue.addAll(['d', 'e']);
+      expect(delegatingQueue, equals(['a', 'b', 'cc', 'd', 'e']));
+    });
+
+    test('addFirst', () {
+      delegatingQueue.addFirst('d');
+      expect(delegatingQueue, equals(['d', 'a', 'b', 'cc']));
+    });
+
+    test('addLast', () {
+      delegatingQueue.addLast('d');
+      expect(delegatingQueue, equals(['a', 'b', 'cc', 'd']));
+    });
+
+    test('clear', () {
+      delegatingQueue.clear();
+      expect(delegatingQueue, equals([]));
+    });
+
+    test('remove', () {
+      expect(delegatingQueue.remove('b'), isTrue);
+      expect(delegatingQueue, equals(['a', 'cc']));
+    });
+
+    test('removeFirst', () {
+      expect(delegatingQueue.removeFirst(), 'a');
+      expect(delegatingQueue, equals(['b', 'cc']));
+    });
+
+    test('removeLast', () {
+      expect(delegatingQueue.removeLast(), 'cc');
+      expect(delegatingQueue, equals(['a', 'b']));
+    });
+  });
+}