Update charted to 0.4.8 and roll

packages/quiver_iterables/test/generating_iterable_test.dart

-// Copyright 2014 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.iterables.property_iterable_test;
-
-import 'package:test/test.dart';
-import 'package:quiver_iterables/iterables.dart';
-
-main() {
-  group('GeneratingIterable', () {
-    test("should create an empty iterable for a null start object", () {
-      var iterable = new GeneratingIterable(() => null, (n) => null);
-      expect(iterable, []);
-    });
-
-    test("should create one-item empty iterable when next returns null", () {
-      var iterable = new GeneratingIterable(() => "Hello", (n) => null);
-      expect(iterable, ["Hello"]);
-    });
-
-    test("should add items until next returns null", () {
-      var parent = new Node();
-      var node = new Node()..parent = parent;
-      var iterable = new GeneratingIterable<Node>(() => node, (n) => n.parent);
-      expect(iterable, [node, parent]);
-    });
-  });
-}
-
-class Node {
-  Node parent;
-}