public function testOutput($config)
{
$pdf = new CakePdf($config);
$pdf->viewVars(['data' => 'testing']);
$pdf->template('testing', 'pdf');
$result = $pdf->output();
$expected = 'Data: testing';
$this->assertEquals($expected, $result);
$html = '<h2>Title</h2>';
$result = $pdf->output($html);
$this->assertEquals($html, $result);
$html = '';
$result = $pdf->output($html);
$this->assertEquals($html, $result);
}