public function testXlsx()
 {
     $format = new ExcelFormat();
     $localFile = new LocalFileStorage(new \SplFileObject(__DIR__ . '/../../../../metadata/testfiles/flatdata-excel-xml.xlsx'), $format);
     $reader = $localFile->reader();
     $info = $localFile->info();
     $this->assertEquals(new StorageInfo(array('name' => 'flatdata-excel-xml.xlsx', 'format' => $format, 'size' => 8895, 'count' => 2, 'hash' => 'b297aa9bbc37f9cd51d8472498772474')), $info);
     $headers = $reader->getColumnHeaders();
     $this->assertEquals(2, count($headers));
 }