Bugfix: make the new compilation artifact layout also work with dart2dart

tools/testing/dart/test_runner.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.
 
 /**
  * Classes and methods for executing tests.
  *
  * This module includes:
  * - Managing parallel execution of tests, including timeout checks.
  * - Evaluating the output of each test as pass/fail/crash/timeout.
@@ skipping 180 matching lines @@
     // After the actual compile, we synchronously copy the compiled output files
     // to shadow files.
     _copyFilesSync(_outputFile, _shadowFile);
     return new Future.immediate(null);
   }
 
   _copyFilesSync(String from, String to) {
     for (var ending in ['', '.deps', '.map']) {
       var fromFile = new io.File("${from}${ending}");
       var toFile = new io.File("${to}${ending}");
-      // We copy the dart2js results synchronously to make it atomic.
-      // This ensures that the shadow files are always in a consistent state (no
-      // other code in the testing scripts will see a half-written shadow
-      // file).
-      toFile.writeAsBytesSync(fromFile.readAsBytesSync());
+      if (fromFile.existsSync()) {

[kustermann, 2013/06/25 13:58:57]

Seems like we don't have .map files with dart2dart.

+        // We copy the dart2js results synchronously to make it atomic.
+        // This ensures that the shadow files are always in a consistent state
+        // (no other code in the testing scripts will see a half-written shadow
+        // file).
+        toFile.writeAsBytesSync(fromFile.readAsBytesSync());
+      }
     }
   }
 }
 
 class ContentShellCommand extends Command {
   /**
    * If [expectedOutputPath] is set, the output of content shell is compared
    * with the content of [expectedOutputPath].
    * This is used for example for pixel tests, where [expectedOutputPath] points
    * to a *png file.
@@ skipping 1728 matching lines @@
     }
   }
 
   void eventAllTestsDone() {
     for (var listener in _eventListener) {
       listener.allDone();
     }
   }
 }