Add corelib tests

test/codegen/corelib/iterable_last_where_test.dart

+// Copyright (c) 2012, 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() {
+  List<int> list1 = <int>[1, 2, 3];
+  List<int> list2 = const <int>[4, 5, 6];
+  List<String> list3 = <String>[];
+  Set<int> set1 = new Set<int>();
+  set1..add(11)
+      ..add(12)
+      ..add(13);
+  Set set2 = new Set();
+
+  Expect.equals(2, list1.lastWhere((x) => x.isEven));
+  Expect.equals(3, list1.lastWhere((x) => x.isOdd));
+  Expect.throws(() => list1.lastWhere((x) => x > 3),
+                (e) => e is StateError);
+  Expect.equals(null, list1.lastWhere((x) => x > 3, orElse: () => null));
+  Expect.equals(499, list1.lastWhere((x) => x > 3, orElse: () => 499));
+
+  Expect.equals(6, list2.lastWhere((x) => x.isEven));
+  Expect.equals(5, list2.lastWhere((x) => x.isOdd));
+  Expect.throws(() => list2.lastWhere((x) => x == 0),
+                (e) => e is StateError);
+  Expect.equals(null, list2.lastWhere((x) => false, orElse: () => null));
+  Expect.equals(499, list2.lastWhere((x) => false, orElse: () => 499));
+
+  Expect.throws(() => list3.lastWhere((x) => x == 0),
+                (e) => e is StateError);
+  Expect.throws(() => list3.lastWhere((x) => true), (e) => e is StateError);
+  Expect.equals(null, list3.lastWhere((x) => true, orElse: () => null));
+  Expect.equals("str", list3.lastWhere((x) => false, orElse: () => "str"));
+
+  Expect.equals(12, set1.lastWhere((x) => x.isEven));
+  var odd = set1.lastWhere((x) => x.isOdd);
+  Expect.isTrue(odd == 11 || odd == 13);
+  Expect.throws(() => set1.lastWhere((x) => false), (e) => e is StateError);
+  Expect.equals(null, set1.lastWhere((x) => false, orElse: () => null));
+  Expect.equals(499, set1.lastWhere((x) => false, orElse: () => 499));
+
+  Expect.throws(() => set2.lastWhere((x) => false), (e) => e is StateError);
+  Expect.throws(() => set2.lastWhere((x) => true), (e) => e is StateError);
+  Expect.equals(null, set2.lastWhere((x) => true, orElse: () => null));
+  Expect.equals(499, set2.lastWhere((x) => false, orElse: () => 499));
+}