Update charted to 0.4.8 and roll

packages/quiver_iterables/test/concat_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.iterables.concat_test;
-
-import 'package:test/test.dart';
-import 'package:quiver_iterables/iterables.dart';
-
-main() {
-  group('concat', () {
-    test('should handle empty input iterables', () {
-      expect(concat([]), isEmpty);
-    });
-
-    test('should handle single input iterables', () {
-      expect(
-          concat([
-            [1, 2, 3]
-          ]),
-          [1, 2, 3]);
-    });
-
-    test('should chain multiple input iterables', () {
-      expect(
-          concat([
-            [1, 2, 3],
-            [-1, -2, -3]
-          ]),
-          [1, 2, 3, -1, -2, -3]);
-    });
-
-    test('should throw for null input', () {
-      expect(() => concat(null), throws);
-    });
-
-    test('should throw if any input is null', () {
-      expect(
-          () => concat([
-                [1, 2],
-                null,
-                [3, 4]
-              ]).toList(),
-          throws);
-    });
-
-    test('should reflectchanges in the inputs', () {
-      var a = [1, 2];
-      var b = [4, 5];
-      var ab = concat([a, b]);
-      expect(ab, [1, 2, 4, 5]);
-      a.add(3);
-      b.add(6);
-      expect(ab, [1, 2, 3, 4, 5, 6]);
-    });
-  });
-}