Migrate test block 3 to Dart 2.0.

tests/corelib/collection_test.dart

-// Copyright (c) 2011, the Dart 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 collection_test;
-
-import "package:expect/expect.dart";
-import 'dart:collection' show Queue;
-
-class CollectionTest {
-  CollectionTest(Iterable iterable) {
-    testFold(iterable);
-  }
-
-  void testFold(Iterable iterable) {
-    Expect.equals(28, iterable.fold(0, (prev, element) => prev + element));
-    Expect.equals(3024, iterable.fold(1, (prev, element) => prev * element));
-  }
-}
-
-main() {
-  final TEST_ELEMENTS = const [4, 2, 6, 7, 9];
-  // Const list.
-  new CollectionTest(TEST_ELEMENTS);
-
-  // Fixed size list.
-  var fixedList = new List(TEST_ELEMENTS.length);
-  for (int i = 0; i < TEST_ELEMENTS.length; i++) {
-    fixedList[i] = TEST_ELEMENTS[i];
-  }
-  new CollectionTest(fixedList);
-
-  // Growable list.
-  new CollectionTest(new List.from(TEST_ELEMENTS));
-
-  // Set.
-  new CollectionTest(new Set.from(TEST_ELEMENTS));
-
-  // Queue.
-  new CollectionTest(new Queue.from(TEST_ELEMENTS));
-}