Update test status and add new tests.

language/src/Library4NegativeTest.dart

Index: language/src/Library4NegativeTest.dart
===================================================================
--- language/src/Library4NegativeTest.dart	(revision 0)
+++ language/src/Library4NegativeTest.dart	(revision 0)
@@ -0,0 +1,15 @@
+// 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.
+
+// This test should fail to load because we are importing two libraries
+// which define the same top level name. In this case libraryE.dart is
+// importing libraryC.dart and libraryF.dart which both define variable
+// "fooC".
+
+#library("Library4NegativeTest.dart");
+#import("library1.dart");
+#import("library3.dart", prefix:"foo");
+
+main() {
+}