Move tests using frog 'native' extension from tests/language to frog/tests

tests/language/src/NativeClassInheritance3FrogTest.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 to noSuchMethod
-// interferes with subsequent resolving of the method.  This might happen if the
-// noSuchMethod is cached on Object.prototype.
-
-class A1 native "*A1" {
-  foo() native;
-}
-
-class B1 extends A1 native "*B1" {
-}
-
-makeA1() native;
-makeB1() native;
-
-
-class A2 native "*A2" {
-  foo([a=99]) native;
-}
-
-class B2 extends A2 native "*B2" {
-}
-
-makeA2() native;
-makeB2() native;
-
-makeObject() 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 A1(){}
-function B1(){}
-inherits(B1, A1);
-
-makeA1 = function(){return new A1};
-makeB1 = function(){return new B1};
-
-function A2(){}
-function B2(){}
-inherits(B2, A2);
-A2.prototype.foo = function(a){return 'A2.foo(' + a  + ')';}
-
-makeA2 = function(){return new A2};
-makeB2 = function(){return new B2};
-
-makeObject = function(){return new Object};
-""";
-
-
-main() {
-  setup();
-
-  var a1 = makeA1();
-  var b1 = makeB1();
-  var ob = makeObject();
-
-  // Does calling missing methods in one tree of inheritance forest affect other
-  // trees?
-  expectNoSuchMethod(() => b1.foo(), 'b1.foo()');
-  expectNoSuchMethod(() => a1.foo(), 'a1.foo()');
-  expectNoSuchMethod(() => ob.foo(), 'ob.foo()');
-
-  var a2 = makeA2();
-  var b2 = makeB2();
-
-  Expect.equals('A2.foo(99)', a2.foo());
-  Expect.equals('A2.foo(99)', b2.foo());
-  Expect.equals('A2.foo(1)', a2.foo(1));
-  Expect.equals('A2.foo(2)', b2.foo(2));
-
-
-  expectNoSuchMethod(() => b1.foo(3), 'b1.foo(3)');
-  expectNoSuchMethod(() => a1.foo(4), 'a1.foo(4)');
-}
-
-expectNoSuchMethod(action, note) {
-  bool caught = false;
-  try {
-    action();
-  } catch (var ex) {
-    caught = true;
-    Expect.isTrue(ex is NoSuchMethodException, note);
-  }
-  Expect.isTrue(caught, note);
-}