private function reportOpenOfficeConverter()
 {
     $converter = new Converter();
     $converter->configure(ContentType::pdf(), $this->tempDirectory);
     try {
         $bin = $converter->convert(file_get_contents(__DIR__ . '/../../../../test/data/test.odt'));
     } catch (OpenOfficeException $e) {
         return 'ERROR: Plugin openoffice cannot convert document.';
     }
     return strval(ContentType::pdf()) === strval(ContentType::byString($bin)) ? null : 'ERROR: Plugin openoffice converts to wrong content type.';
 }
 private function converter()
 {
     $converter = new Converter();
     return $converter->configure(ContentType::pdf(), $this->tempDir);
 }