Initialize dart-lang/tuple with the tuple package at v1.0.1.

test/tuple_test.dart

+// Copyright (c) 2015, the tuple 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.
+
+library tuple.test;
+
+import 'package:test/test.dart';
+import 'package:tuple/tuple.dart';
+
+main() {
+  group("Tuple tests", () {
+    final t = new Tuple2<int, bool>(1, true);
+
+    test('items', () {
+      expect(t.item1, equals(1));
+      expect(t.item2, equals(true));
+    });
+
+    test('withItems', () {
+      expect(t.withItem1(2), equals(new Tuple2<int, bool>(2, true)));
+      expect(t.withItem2(false), equals(new Tuple2<int, bool>(1, false)));
+    });
+
+    test('create a tuple from a list of items', () {
+      final t1 = new Tuple2.fromList([1, true]);
+      expect(t1.item1, equals(1));
+      expect(t1.item2, equals(true));
+
+      expect(() => new Tuple2.fromList([1]), throwsA(new isInstanceOf<ArgumentError>()));
+      expect(() => new Tuple2.fromList([1, true, 'a']), throwsA(new isInstanceOf<ArgumentError>()));
+    });
+
+    test('equality', () {
+      final otherT = new Tuple2<int, bool>(1, true);
+      expect(t, equals(otherT));
+    });
+
+    test('nested equality', () {
+      final t1 = new Tuple2<Tuple2<int, String>, bool>(
+          new Tuple2<int, String>(3, 'a'), false);
+      final t2 = new Tuple2<Tuple2<int, String>, bool>(
+          new Tuple2<int, String>(3, 'a'), false);
+      expect(t1, equals(t2));
+    });
+
+    test('can be used as keys in maps', () {
+      final map = {t: 'a'};
+      final key = new Tuple2<int, bool>(1, true);
+      expect(map[key], equals('a'));
+    });
+
+    test('toList() should return a listing containing the items of the tuple',
+        () {
+      expect(t.toList(), orderedEquals([1, true]));
+    });
+
+    test('toList() should return a fixed list by default', () {
+      expect(() => t.toList().add(3),
+          throwsA(new isInstanceOf<UnsupportedError>()));
+    });
+
+    test('toList(growable: true) should return a growable list', () {
+      expect(t.toList(growable: true)..add('a'), orderedEquals([1, true, 'a']));
+    });
+  });
+}