public function testBarcodeMessageIsString()
{
$barcode = new Barcode(Barcode::TYPE_QR, 123);
$barcode->setAltText(456);
$this->assertInternalType('string', $barcode->getMessage());
$this->assertInternalType('string', $barcode->getAltText());
$barcodeDetails = $barcode->toArray();
$this->assertInternalType('string', $barcodeDetails['message']);
$this->assertInternalType('string', $barcodeDetails['altText']);
$barcode->setMessage(789);
$this->assertInternalType('string', $barcode->getMessage());
$barcode->setMessage(null);
$this->assertEquals('', $barcode->getMessage());
}