anchor.diff:          .createTempSync('flutter_test_compiler.');
       final File outputDill = outputDillDirectory.childFile('output.dill');
   
  +    printTrace('Compiler will use the following file as its incremental dill file: ${outputDill.path}');
  +
       bool suppressOutput = false;
       void reportCompilerMessage(String message) {
         if (suppressOutput)
  
positive.code:     sb.writeln('  <cachedir>/var/cache/fontconfig</cachedir>');
      sb.writeln('</fontconfig>');
  
      final Directory fontsDir = fs.systemTempDirectory.createTempSync('flutter_test_fonts.');
      _cachedFontConfig = fs.file('${fontsDir.path}/fonts.conf');
      _cachedFontConfig.createSync();
      _cachedFontConfig.writeAsStringSync(sb.toString());
      return _cachedFontConfig;
  
negative.code:   @override
    Future<dynamic> close() async {
      if (compiler != null) {
        await compiler.dispose();
        compiler = null;
      }
      if (fontsDirectory != null) {
        printTrace('Deleting ${fontsDirectory.path}...');
        fontsDirectory.deleteSync(recursive: true);
        fontsDirectory = null;
      }
    }
  
  