Fix test scripts to work with an absolute build directory path on Windows.

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 509 matching lines @@
                                configuration, statusFileRead);
     }
 
     return completer.future;
   }
 
   Future enqueueTests() {
     Directory dir = new Directory.fromPath(suiteDir);
     return dir.exists().chain((exists) {
       if (!exists) {
-        print('Directory containing tests not found: $suiteDir');
+        print('Directory containing tests missing: ${suiteDir.toNativePath()}');
         return new Future.immediate(null);
       } else {
         var group = new FutureGroup();
         enqueueDirectory(dir, group);
         return group.future;
       }
     });
   }
 
   void enqueueDirectory(Directory dir, FutureGroup group) {
@@ skipping 250 matching lines @@
       if (getVmOptions(optionsFromFile).length > 1) {
           optionsName = Strings.join(vmOptions, '-').replaceAll('-','')
                                                     .replaceAll('=','')
                                                     .replaceAll('/','');
       }
       final String tempDir = createOutputDirectory(info.filePath, optionsName);
 
       String dartWrapperFilename = '$tempDir/test.dart';
       String compiledDartWrapperFilename = '$tempDir/test.js';
 
       String htmlPath = '$tempDir/test.html';

[ahe, 2012/12/04 11:24:51]

I'm getting a feeling that this should have been an instance of Uri.  What do
you think?

       if (isWrappingRequired && !isWebTest) {
         // test.dart will import the dart test directly, if it is a library,
         // or indirectly through test_as_library.dart, if it is not.
         Path dartLibraryFilename = filePath;
         if (!isLibraryDefinition) {
           dartLibraryFilename = new Path('test_as_library.dart');
           File file = new File('$tempDir/$dartLibraryFilename');
           RandomAccessFile dartLibrary = file.openSync(FileMode.WRITE);
           dartLibrary.writeStringSync(wrapDartTestInLibrary(filePath));
           dartLibrary.closeSync();
@@ skipping 77 matching lines @@
       }
 
       // Variables for browser multi-tests.
       List<String> subtestNames = info.optionsFromFile['subtestNames'];
       TestCase multitestParentTest;
       int subtestIndex = 0;
       // Construct the command that executes the browser test
       do {
         List<String> args = <String>[];
         String fullHtmlPath = htmlPath.startsWith('http:') ? htmlPath :
-            'file://$htmlPath';
+            (htmlPath.startsWith('/') ?
+             'file://$htmlPath' :
+             'file:///$htmlPath');
         if (info.optionsFromFile['isMultiHtmlTest']
             && subtestNames.length > 0) {
           fullHtmlPath = '${fullHtmlPath}#${subtestNames[subtestIndex]}';
         }
         if (TestUtils.usesWebDriver(runtime)) {
           args = [
               dartDir.append('tools/testing/run_selenium.py').toNativePath(),
               '--browser=$runtime',
               '--timeout=${configuration["timeout"] - 2}',
               '--out="$fullHtmlPath"'];
@@ skipping 771 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);
    }
 }