anchor.diff:    </body>
   </html>
   ''';
  -
  
positive.code:   /// [DEFAULT_HTML_TEST_FILE_TEMPLATE_PATH]) will be used to run the browser
    /// test in.
    Future createTestHtmlFile(String testFileName, [String testHtmlFilePath]) {
      Completer completer = new Completer();
  
      Future<String> htmlFileReader;
  
      if (testHtmlFilePath == null || testHtmlFilePath == "") {
        // If the test does not have an associated test file we'll call the test
        // file inside of a default HTML file.
        htmlFileReader = (new Completer<String>()
          ..complete(_BROWSER_TEST_HTML_FILE_TEMPLATE)).future;
      } else {
        // Custom HTML test files.
        htmlFileReader = new File(testHtmlFilePath).readAsString();
      }
  
      // Read the content of the file.
      htmlFileReader.then((String htmlFileString) {
  
        if (testHtmlFilePath == null || testHtmlFilePath == "") {
          htmlFileString =
              htmlFileString.replaceAll("{{test_file_name}}", testFileName);
  
        } else {
          // For custom HTML test files we add a call to
          // unittest/test_controller.js and we replace the Dart test file call by
          // the intermediary Dart test file that injects the unittest
          // Configuration.
          if (!htmlFileString.contains("packages/unittest/test_controller.js")) {
            htmlFileString = htmlFileString.replaceFirst(
                "</body>", '<script type="text/javascript" '
                'src="/packages/unittest/test_controller.js"></script></body>');
          }
        }
  
        // Create the file (and delete it if it already exists).
        String generatedFilePath = '${generatedTestFilesDirectory.path}/'
            + '${testFileName.replaceAll(new RegExp(r'\.dart$'), '.html')}';
        File generatedFile = new File(generatedFilePath);
        if (generatedFile.existsSync()) {
          generatedFile.deleteSync();
  
negative.code: 
        // Write into the [File].
        generatedFile.writeAsStringSync(htmlFileString);
      });
    }
  
    /// Creates the intermediary Dart file that sets the unittest [Configuration].
  