Pop\Curl\Curl::setReturnTransfer PHP Method

    public function setReturnTransfer($transfer = false)
    {
        $this->setOption(CURLOPT_RETURNTRANSFER, (bool) $transfer);
        return $this;
    }

 public function testSetReturnTransfer()
 {
     $c = new Curl('http://www.popphp.org/version', array(CURLOPT_HEADER => false, CURLOPT_RETURNTRANSFER => false));
     $c->setReturnTransfer(true);
     $this->assertTrue($c->isReturnTransfer());
 }