public function testConstructor()
{
$dompdf = new Dompdf();
$this->assertInstanceOf('Dompdf\\Adapter\\Cpdf', $dompdf->getCanvas());
$this->assertEquals('', $dompdf->getBaseHost());
$this->assertEquals('', $dompdf->getBasePath());
$this->assertInternalType('array', $dompdf->getCallbacks());
$this->assertInstanceOf('Dompdf\\Css\\Stylesheet', $dompdf->getCss());
$this->assertNull($dompdf->getDom());
$this->assertNull($dompdf->getHttpContext());
$this->assertInstanceOf('Dompdf\\Options', $dompdf->getOptions());
$this->assertNull($dompdf->getProtocol());
$this->assertFalse($dompdf->getQuirksmode());
$this->assertNull($dompdf->getTree());
}