public function testConstructor()
{
$this->assertInstanceOf('Pop\\Graph\\Graph', new Graph($this->imageOptions, Graph::FORCE_GD));
$this->assertInstanceOf('Pop\\Graph\\Graph', new Graph($this->imageOptions));
$this->assertInstanceOf('Pop\\Graph\\Graph', new Graph($this->pdfOptions));
$this->assertInstanceOf('Pop\\Graph\\Graph', new Graph($this->svgOptions));
}