Test for finding correct method for overriden native method of hidden native class.

tests/language/src/NativeClassInheritance2FrogTest.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.
+
+// Test to see if resolving a hidden native class's method interferes with
+// subsequent resolving the subclass's method.  This might happen if the
+// superclass caches the method in the prototype, so shadowing the dispatcher
+// stored on Object.prototype.
+
+class A native "*A" {
+  foo([a=100]) native;
+}
+
+class B extends A native "*B" {
+}
+
+class C extends B native "*C" {
+  foo([z=300]) native;
+}
+
+class D extends C native "*D" {
+}
+
+makeA() native;
+makeB() native;
+makeC() native;
+makeD() native;
+
+void setup() native """
+// This code is all inside 'setup' and so not accesible from the global scope.
+function inherits(child, parent) {
+  if (child.prototype.__proto__) {
+    child.prototype.__proto__ = parent.prototype;
+  } else {
+    function tmp() {};
+    tmp.prototype = parent.prototype;
+    child.prototype = new tmp();
+    child.prototype.constructor = child;
+  }
+}
+
+function A(){}
+function B(){}
+inherits(B, A);
+function C(){}
+inherits(C, B);
+function D(){}
+inherits(D, C);
+
+A.prototype.foo = function(a){return 'A.foo(' + a + ')';}
+C.prototype.foo = function(z){return 'C.foo(' + z + ')';}
+
+makeA = function(){return new A};
+makeB = function(){return new B};
+makeC = function(){return new C};
+makeD = function(){return new D};
+""";
+
+
+main() {
+  setup();
+
+  var a = makeA();
+  var b = makeB();
+  var c = makeC();
+  var d = makeD();
+
+  Expect.equals('A.foo(100)', b.foo());
+  Expect.equals('C.foo(300)', d.foo());
+  // If the above line fails with C.foo(100) then the dispatch to fill in the
+  // default got the wrong one, followed by a second dispatch that resolved to
+  // the correct native method.
+
+  Expect.equals('A.foo(1)', a.foo(1));
+  Expect.equals('A.foo(2)', b.foo(2));
+  Expect.equals('C.foo(3)', c.foo(3));
+  Expect.equals('C.foo(4)', d.foo(4));
+}