test rename overhaul: step 6 - isolate tests

tools/testing/dart/multitest.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.
 
 #library("multitest");
 
 #import("dart:io");
 #import("test_suite.dart");
 
 // Multitests are Dart test scripts containing lines of the form
@@ skipping 245 matching lines @@
 String CreateMultitestDirectory(String outputDir, String testDir) {
   final String generatedTestDirectory = 'generated_tests';
   Directory generatedTestDir = new Directory('$outputDir/generated_tests');
   if (!new Directory(outputDir).existsSync()) {
     new Directory(outputDir).createSync();
   }
   if (!generatedTestDir.existsSync()) {
     generatedTestDir.createSync();
   }
   var split = testDir.split('/');
-  var lastComponent = split.removeLast();
-  Expect.isTrue(lastComponent == 'src');
+  if (split.last() == 'src') {
+    // TODO(sigmund): remove this once all tests are migrated to use
+    // TestSuite.forDirectory.
+    split.removeLast();
+  }
   String path = '${generatedTestDir.path}/${split.last()}';
   Directory dir = new Directory(path);
   if (!dir.existsSync()) {
     dir.createSync();
   }
   return path;
 }