Test for shadowing fields when extending native classes

tests/compiler/dart2js_native/subclassing_super_field_1_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";
+import 'dart:_foreign_helper' show JS;
+import 'dart:_js_helper' show Creates, setNativeSubclassDispatchRecord;
+import 'dart:_interceptors' show
+    findInterceptorForType, findConstructorForNativeSubclassType;
+
+// Test for shadowed fields in classes that extend native classes.
+
+class N native "N" {
+  N.init();
+}
+
+class A extends N {
+  var foo = 111;
+  A.init() : super.init();
+}
+
+class B extends A  {
+  var foo = 222;
+  B.init() : super.init();
+
+  Afoo() => super.foo;
+  Bfoo() => foo;
+}
+
+B makeB() native;
+
+@Creates('=Object')
+getBPrototype() native;
+
+void setup() native r"""
+function B() { }
+makeB = function(){return new B;};
+
+getBPrototype = function(){return B.prototype;};
+""";
+
+var inscrutable;
+
+main() {
+  setup();
+  inscrutable = (x) => x;
+
+  setNativeSubclassDispatchRecord(getBPrototype(), findInterceptorForType(B));
+
+  B b = makeB();
+
+  var constructor = findConstructorForNativeSubclassType(B, 'init');
+  Expect.isNotNull(constructor);
+  JS('', '#(#)', constructor, b);
+
+  print(b);
+
+  Expect.equals(222, inscrutable(b).Bfoo());
+  Expect.equals(111, inscrutable(b).Afoo());
+
+  Expect.equals(222, b.Bfoo());
+  Expect.equals(111, b.Afoo());
+}