Make test.dart use the path of the running script to find the Dart checkout.

tools/testing/dart/test_suite.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("test_suite");
 
 #import("dart:io");
 #import("status_file_parser.dart");
 #import("test_runner.dart");
 #import("multitest.dart");
@@ skipping 970 matching lines @@
   }
 
   static String buildDir(Map configuration) {
     var buildDir = outputDir(configuration);
     buildDir += (configuration['mode'] == 'debug') ? 'Debug_' : 'Release_';
     buildDir += configuration['arch'];
     return buildDir;
   }
 
   static String dartDir() {
     Directory dart;

[antonm, 2012/01/31 16:21:38]

do you need this line at all?

[Bill Hesse, 2012/02/01 11:48:34]

no.
On 2012/01/31 16:21:38, antonm wrote:

-    if (new File('tools/testing/dart/test_suite.dart').existsSync()) {
-      return new File('.').fullPathSync().replaceAll('\\', '/');
-    } else if (new File('../tools/testing/dart/test_suite.dart').existsSync()) {
-      return new File('..').fullPathSync().replaceAll('\\', '/');
-    } else {
-      print('Run test.dart from the dart directory or' +
-            ' an immediate subdirectory only.');
-      Expect.fail('Could not find top level dart directory.');
-    }
+    String scriptPath = new Options().script.replaceAll('\\', '/');
+    String toolsDir = scriptPath.substring(0, scriptPath.lastIndexOf('/'));
+    return new File('$toolsDir/..').fullPathSync().replaceAll('\\', '/');    
   }
 
   static List<String> standardOptions(Map configuration) {
     List args = ["--ignore-unrecognized-flags"];
     if (configuration["checked"]) {
       args.add('--enable_asserts');
       args.add("--enable_type_checks");
     }
     if (configuration["component"] == "leg") {
       args.add("--enable_leg");
@@ skipping 52 matching lines @@
  * $noCrash tests are expected to be flaky but not crash
  * $pass tests are expected to pass
  * $failOk tests are expected to fail that we won't fix
  * $fail tests are expected to fail that we should fix
  * $crash tests are expected to crash that we should fix
  * $timeout tests are allowed to timeout
 """;
     print(report);
    }
 }