Add corelib tests

test/codegen/corelib/unicode_test.dart

Index: test/codegen/corelib/unicode_test.dart
diff --git a/test/codegen/language/prefix_test.dart b/test/codegen/corelib/unicode_test.dart
similarity index 60%
copy from test/codegen/language/prefix_test.dart
copy to test/codegen/corelib/unicode_test.dart
index ec3208e84cb67a9749dc4945e91dab4e3cae2e80..32cddb50f3f368f3eaa4affa6b0dd6aa1183a9da 100644
--- a/test/codegen/language/prefix_test.dart
+++ b/test/codegen/corelib/unicode_test.dart
@@ -2,16 +2,17 @@
 // 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.
 
-library PrefixTest.dart;
 import "package:expect/expect.dart";
-import "prefix_test1.dart";
 
-class PrefixTest {
+class UnicodeTest {
+
   static testMain() {
-    Expect.equals(Prefix.getSource(), Prefix.getImport() + 1);
+    var lowerStrasse =
+        new String.fromCharCodes([115, 116, 114, 97, 223, 101]);
+    Expect.equals("STRASSE", lowerStrasse.toUpperCase());
   }
 }
 
 main() {
-  PrefixTest.testMain();
+  UnicodeTest.testMain();
 }