Getting started on options parsing.

tests/standalone/test_config.dart

 // 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.
 
 #library("standalone_test_config");
 
 #import("../../tools/testing/dart/test_runner.dart");
 #import("../../tools/testing/dart/status_file_parser.dart");
 
 class StandaloneTestSuite {
@@ skipping 16 matching lines @@
     // Read configuration from status file.
     List<Section> sections = new List<Section>();
     ReadConfigurationInto(statusFilePath, sections);
 
     processDirectory();
   }
 
   void processDirectory() {
     directoryPath = getDirname(directoryPath);
     Directory dir = new Directory(directoryPath);
-    Expect.isTrue(dir.existsSync(),
-        "Cannot find tests/standalone/src or ../tests/standalone/src");
-      // TODO(ager): Use dir.errorHandler instead when it is implemented.
+    dir.errorHandler = (s) {
+      throw s;
+    };
     dir.fileHandler = processFile;
     dir.doneHandler = doDone;
     dir.list(false);
   }
 
   void processFile(String filename) {
     if (!filename.endsWith("Test.dart")) return;
     int start = filename.lastIndexOf(pathSeparator);
     String testName = filename.substring(start + 1, filename.length - 5);
     // TODO(whesse): Gather test case info from status file and test file.
     doTest(new TestCase(testName,
                         shellPath,
                         <String>["--enable_type_checks",
                                  "--ignore-unrecognized-flags",
                                  filename ],
                         completeHandler,
                         new Set.from([PASS, FAIL, CRASH, TIMEOUT])));
   }
   
   void completeHandler(TestCase testCase) {
     TestOutput output = testCase.output;
     print("Exit code: ${output.exitCode} Time: ${output.time}");
   }
 }