getActiveSheet()->getCell('E10')->setValue('Comment'); $spreadsheet->getActiveSheet() ->getComment('E10') ->getText() ->createText('Comment to test'); $reloadedSpreadsheet = $this->writeAndReload($spreadsheet, $format); $commentsLoaded = $reloadedSpreadsheet->getSheet(0)->getComments(); self::assertCount(1, $commentsLoaded); $commentCoordinate = key($commentsLoaded); self::assertSame('E10', $commentCoordinate); } }