getMockBuilder('\DOMPDF') ->setMethods(['load_html']) ->getMock(); $pdf = new \Vsmoraes\Pdf\Dompdf($stub); $stub->expects($this->once()) ->method('load_html'); $pdf->load(''); } public function testShowHtml() { $stub = $this->getMockBuilder('\DOMPDF') ->getMock(); $pdf = new \Vsmoraes\Pdf\Dompdf($stub); $stub->expects($this->once()) ->method('stream'); $pdf->load(''); $pdf->show(); } }