Update test status and add new tests.

language/src/Library2NegativeTest.dart

Index: language/src/Library2NegativeTest.dart
===================================================================
--- language/src/Library2NegativeTest.dart	(revision 0)
+++ language/src/Library2NegativeTest.dart	(revision 0)
@@ -0,0 +1,14 @@
+// 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.
+
+#library("Library2NegativeTest.dart");
+#import("library3.dart");  // imports library2.dart which defines foo/foo1.
+#import("library4.dart");  // imports library2.dart and defines foo/foo1.
+
+main() {
+  Expect.equals(0, foo1);
+}