getActiveSheet();
$sheet->getCell('A1')->setValue(1);
$sheet2 = $spreadsheet->createSheet();
$sheet2->setTitle('
');
$sheet2->getCell('A2')->setValue(2);
$writer = new HtmlWriter($spreadsheet);
$writer->writeAllSheets();
$eol = $writer->getLineEnding();
$html = $writer->generateHTMLAll();
$expected = '';
self::assertStringContainsString($expected, $html, 'appropriate characters are escaped');
$spreadsheet->disconnectWorksheets();
}
}