test.py: First step towards support of caching dart2js compilations across runtimes

tests/standalone/io/skipping_dart2js_compilations_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.
 
 /*
  * This test makes sure that the "skipping Dart2Js compilations if the output is
  * already up to date" feature does work as it should.
  * Therefore this test ensures that compilations are only skipped if the last
  * modified date of the output of a dart2js compilation is newer than
  *   - the the dart application to compile (including it's dependencies)
@@ skipping 113 matching lines @@
 class TestCompletedHandler {
   FileUtils fileUtils;
   DateTime _expectedTimestamp;
   bool _shouldHaveRun;
 
   TestCompletedHandler(FileUtils this.fileUtils, bool this._shouldHaveRun);
 
   void processCompletedTest(runner.TestCase testCase) {
     var output = testCase.lastCommandOutput;
 
-    Expect.isFalse(output.unexpectedOutput);
+    Expect.isFalse(testCase.unexpectedOutput);
     Expect.isTrue(output.stderr.length == 0);
     if (_shouldHaveRun) {
       Expect.isTrue(output.stdout.length == 0);
       Expect.isTrue(new File(fileUtils.scriptOutputPath.toNativePath())
           .existsSync());
     } else {
       Expect.isFalse(new File(fileUtils.scriptOutputPath.toNativePath())
           .existsSync());
     }
   }
@@ skipping 96 matching lines @@
       cleanup();
       throw error;
     }).then((_) {
       cleanup();
     });
   }
   // We need to wait some time to make sure that the files we 'touch' get a
   // bigger timestamp than the old ones
   new Timer(new Duration(seconds: 1), touchFilesAndRunTests);
 }