Migrate test block 11 to Dart 2.0.

tests/corelib_strong/iterable_generate_test.dart

-// Copyright (c) 2013, 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.
-
-import "package:expect/expect.dart";
-
-main() {
-  bool checkedMode = false;
-  assert((checkedMode = true));
-  void test(expectedList, generatedIterable) {
-    Expect.equals(expectedList.length, generatedIterable.length);
-    Expect.listEquals(expectedList, generatedIterable.toList());
-  }
-
-  test([], new Iterable.generate(0));
-  test([0], new Iterable.generate(1));
-  test([0, 1, 2, 3, 4], new Iterable.generate(5));
-  test(["0", "1", "2", "3", "4"], new Iterable.generate(5, (x) => "$x"));
-  test([2, 3, 4, 5, 6], new Iterable.generate(7).skip(2));
-  test([0, 1, 2, 3, 4], new Iterable.generate(7).take(5));
-  test([], new Iterable.generate(5).skip(6));
-  test([], new Iterable.generate(5).take(0));
-  test([], new Iterable.generate(5).take(3).skip(3));
-  test([], new Iterable.generate(5).skip(6).take(0));
-
-  // Test types.
-
-  Iterable<int> it = new Iterable<int>.generate(5);
-  Expect.isTrue(it is Iterable<int>);
-  Expect.isTrue(it.iterator is Iterator<int>);
-  Expect.isTrue(it is! Iterable<String>);
-  Expect.isTrue(it.iterator is! Iterator<String>);
-  test([0, 1, 2, 3, 4], it);
-
-  Iterable<String> st = new Iterable<String>.generate(5, (x) => "$x");
-  Expect.isTrue(st is Iterable<String>);
-  Expect.isTrue(st.iterator is Iterator<String>);
-  Expect.isFalse(st is Iterable<int>);
-  Expect.isFalse(st.iterator is Iterator<int>);
-  test(["0", "1", "2", "3", "4"], st);
-
-  if (checkedMode) {
-    Expect.throws(() => new Iterable<String>.generate(5));
-  }
-}