public function testSetMargin()
{
$exporter = $this->getMockForAbstractClass(AbstractPhantomExporter::class);
$exporter->setMargin('{top: "0px", right: "0px", bottom: "0px", left: "0px"}');
$this->assertEquals('{top: "0px", right: "0px", bottom: "0px", left: "0px"}', $exporter->getMargin());
$exporter->setMargin('5px');
$this->assertEquals('"5px"', $exporter->getMargin());
}