public function it_creates_an_excel_file_on_flush(ExcelBuilderInterface $builder)
 {
     $this->filePath = tempnam('/tmp', 'spec');
     $this->setFilePath($this->filePath);
     unlink($this->filePath);
     $builder->getExcelObject()->willReturn(new \PHPExcel());
     $this->flush();
     if (!file_exists($this->filePath)) {
         throw new \PhpSpec\Exception\Example\FailureException('No created file');
     }
 }
 /**
  * {@inheritdoc}
  */
 public function flush()
 {
     $writer = new \PHPExcel_Writer_Excel2007($this->builder->getExcelObject());
     $writer->save($this->getPath());
 }