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
+// 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.
 
 #library("test_suite");
 
 #import("dart:io");
 #import("status_file_parser.dart");
 #import("test_runner.dart");
 #import("multitest.dart");
 
@@ skipping 193 matching lines @@
           new Timer(enqueueCachedTests, 0);
         }
       }
     }
 
     // Read test expectations from status files.
     testExpectations =
         new TestExpectations(complexMatching: complexStatusMatching());
     for (var statusFilePath in statusFilePaths) {
       ReadTestExpectationsInto(testExpectations,
-                               statusFilePath,
+                               '$dartDir/$statusFilePath',
                                configuration,
                                statusFileRead);
     }
   }
 
   void processDirectory() {
-    directoryPath = getDirname(directoryPath);
+    directoryPath = '$dartDir/$directoryPath';
     Directory dir = new Directory(directoryPath);
     dir.errorHandler = (s) {
       throw s;
     };
     dir.fileHandler = processFile;
     dir.doneHandler = directoryListingDone;
     dir.list(recursive: listRecursively());
   }
 
   void enqueueTestCaseFromTestInformation(TestInformation info) {
@@ skipping 227 matching lines @@
           break;
         case 'dartium':
           // No compilation phase.
           compilerExecutable = null;
           compilerArgs = null;
           break;
         default:
           Expect.fail('unimplemented component $component');
       }
 
-      String executable = getFilename(dumpRenderTreeFilename);
+      String executable = dumpRenderTreeFilename;
       List<String> args;
       if (component == 'webdriver') {
         executable = 'python';
         if (new Platform().operatingSystem() == 'windows') {
           // For Windows, the first command, must have the Windows 
           // slash direction.
           // TODO(efortuna): Get rid of this hack when issue 1306 is fixed.
           executable = executable.replaceAll('/', '\\');
         }
         args = ['$dartDir/tools/testing/run_selenium.py', '--out=$htmlPath', 
@@ skipping 102 matching lines @@
   String getHtmlName(String filename) {
     return filename.replaceAll('/', '_').replaceAll(':', '_') 
         + configuration['component'] + '.html';
   }
 
   String get dumpRenderTreeFilename() {
     if (configuration['drt'] != '') {
       return configuration['drt'];
     }
     if (new Platform().operatingSystem() == 'macos') {
-      return 'client/tests/drt/DumpRenderTree.app/Contents/' +
+      return '$dartDir/client/tests/drt/DumpRenderTree.app/Contents/' +
           'MacOS/DumpRenderTree';
     }
-    return 'client/tests/drt/DumpRenderTree';
+    return '$dartDir/client/tests/drt/DumpRenderTree';
   }
 
   void testGeneratorStarted() {
     ++activeTestGenerators;
   }
 
   void testGeneratorDone() {
     --activeTestGenerators;
     if (activeTestGenerators == 0 && listingDone) {
       doDone();
@@ skipping 151 matching lines @@
 
   List<String> additionalOptions(String filename) {
     filename = new File(filename).fullPathSync().replaceAll('\\', '/');
     Directory tempDir = createOutputDirectory(filename, 'dartc-test');
     return
         [ '--fatal-warnings', '--fatal-type-errors', 
           '-check-only', '-out', tempDir.path];
   }
 
   void processDirectory() {
-    directoryPath = getDirname(directoryPath);
+    directoryPath = '$dartDir/$directoryPath';
     // Enqueueing the directory listers is an activity.
     activityStarted();
     for (String testDir in _testDirs) {
       Directory dir = new Directory("$directoryPath/$testDir");
       if (dir.existsSync()) {
         activityStarted();
         dir.errorHandler = (s) {
           throw s;
         };
         dir.fileHandler = processFile;
@@ skipping 50 matching lines @@
 
     buildDir = TestUtils.buildDir(configuration);
     computeClassPath();
     testClasses = <String>[];
     // Do not read the status file.
     // All exclusions are hardcoded in this script, as they are in testcfg.py.
     processDirectory();
   }
 
   void processDirectory() {
-    directoryPath = getDirname(directoryPath);
+    directoryPath = '$dartDir/$directoryPath';
     Directory dir = new Directory(directoryPath);
 
     dir.errorHandler = (s) {
       throw s;
     };
     dir.fileHandler = processFile;
     dir.doneHandler = createTest;
     dir.list(recursive: true);
   }
 
@@ skipping 131 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;
-    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);
    }
 }