Implement reflect() with Dart code, InstanceMirror.type and ClosureMirror.function with internal co…

runtime/tests/vm/dart/isolate_mirror_local_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.
 //
 // Dart test program for checking implemention of MirrorSystem when
 // inspecting the current isolate.
 //
 // VMOptions=--enable_type_checks
 
 library isolate_mirror_local_test;
@@ skipping 372 matching lines @@
 
 void testBoolInstanceMirror(InstanceMirror mirror) {
   Expect.equals(const Symbol('bool'), mirror.type.simpleName);
   Expect.isTrue(mirror.hasReflectee);
   Expect.equals(true, mirror.reflectee);
   Expect.equals("InstanceMirror on true", mirror.toString());
   testDone('testBoolInstanceMirror');
 }
 
 void testNullInstanceMirror(InstanceMirror mirror) {
-  // TODO(turnidge): This is returning the wrong class.  Fix it.
-  Expect.equals(const Symbol('Object'), mirror.type.simpleName);
+  Expect.equals(const Symbol('Null'), mirror.type.simpleName);
   Expect.isTrue(mirror.hasReflectee);
   Expect.equals(null, mirror.reflectee);
   Expect.equals("InstanceMirror on null", mirror.toString());
   testDone('testNullInstanceMirror');
 }
 
 class MySuperClass {
 }
 
 class MyInterface {
@@ skipping 130 matching lines @@
   // Test that an isolate can reflect on itself.
   mirrorSystemOf(exit_port.toSendPort()).then(testMirrorSystem);
 
   testIntegerInstanceMirror(reflect(1001));
   testStringInstanceMirror(reflect('This\nis\na\nString'));
   testBoolInstanceMirror(reflect(true));
   testNullInstanceMirror(reflect(null));
   testCustomInstanceMirror(reflect(new MyClass(17)));
   testMirrorErrors(currentMirrorSystem());
 }