Fix test.dart's --build-directory option to accept absolute paths.

tools/testing/dart/test_suite.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 enumerating and preparing tests.
  *
  * This library includes:
  *
  * - Creating tests by listing all the Dart files in certain directories,
@@ skipping 1010 matching lines @@
     }
 
     // Create '[build dir]/generated_tests/$compiler-$runtime/$testUniqueName',
     // including any intermediate directories that don't exist.
     // If the tests are run in checked or minified mode we add that to the
     // '$compile-$runtime' directory name.
     var checked = configuration['checked'] ? '-checked' : '';
     var minified = configuration['minified'] ? '-minified' : '';
     var dirName = "${configuration['compiler']}-${configuration['runtime']}"
                   "$checked$minified";
-    var generatedTestPath = Strings.join([
-        buildDir,
-        'generated_tests',
-        dirName,
-        testUniqueName
-    ], '/');
+    Path generatedTestPath = new Path.fromNative(buildDir)

[ahe, 2012/12/03 11:42:39]

Nice.

+        .append('generated_tests')
+        .append(dirName)
+        .append(testUniqueName);
 
-    TestUtils.mkdirRecursive(new Path('.'), new Path(generatedTestPath));
-    return new File(generatedTestPath).fullPathSync().replaceAll('\\', '/');
+    TestUtils.mkdirRecursive(new Path('.'), generatedTestPath);
+    return new File.fromPath(generatedTestPath).fullPathSync()
+        .replaceAll('\\', '/');
   }
 
   String get scriptType {
     switch (configuration['compiler']) {
       case 'none':
       case 'dart2dart':
         return 'application/dart';
       case 'dart2js':
       case 'dartc':
         return 'text/javascript';
@@ skipping 625 matching lines @@
  * $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
  * $compileErrorSkip tests are skipped on browsers due to compile-time error
 """;
     print(report);
    }
 }