Reuse existing test instead of duplicating code.

dart/tests/lib/mirrors/library_metadata_test.dart

 // Copyright (c) 2013, 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.
 
 @string @symbol
 library test.library_metadata_test;
 
 import 'dart:mirrors';
 
-const string = 'a metadata string';
-
-const symbol = const Symbol('symbol');
-
-const hest = 'hest';
-
-checkMetadata(DeclarationMirror mirror, List expectedMetadata) {
-  List metadata = mirror.metadata.map((m) => m.reflectee).toList();
-  if (metadata == null) {
-    throw 'Null metadata on $mirror';
-  }
-  int expectedLength = expectedMetadata.length;
-  int actualLength = metadata.length;
-  if (expectedLength != actualLength) {
-    throw 'Expected length = $expectedLength, but got length = $actualLength.';
-  }
-  for (int i = 0; i < expectedLength; i++) {
-    if (metadata[i] != expectedMetadata[i]) {
-      throw '${metadata[i]} is not "${expectedMetadata[i]}"'
-          ' in $mirror at index $i';
-    }
-  }
-  print(metadata);
-}
+import 'metadata_test.dart';
 
 main() {
-  if (MirrorSystem.getName(symbol) != 'symbol') {
-    // This happened in dart2js due to how early library metadata is
-    // computed.
-    throw 'Bad constant: $symbol';
-  }
-
   MirrorSystem mirrors = currentMirrorSystem();
   checkMetadata(mirrors.findLibrary(const Symbol('test.library_metadata_test')).first,
-                [string, symbol]); 
+                [string, symbol]);
 }