Pop\Graph\Graph::addFont PHP Method

    public function addFont($font)
    {
        if ($this->adapter instanceof Pdf) {
            $this->adapter->addFont($font);
            $this->font = $this->adapter->getLastFontName();
            $this->fonts[$this->font] = $this->font;
        } else {
            $this->font = $font;
            if (strpos($this->font, DIRECTORY_SEPARATOR) !== false) {
                $this->font = substr($this->font, strrpos($this->font, DIRECTORY_SEPARATOR) + 1);
            }
            if (strpos($this->font, '.') !== false) {
                $this->font = substr($this->font, 0, strrpos($this->font, '.'));
            }
            $this->fonts[$this->font] = $font;
        }
        return $this;
    }

 public function testAddPieChart()
 {
     $pie = array('x' => 320, 'y' => 240, 'w' => 200, 'h' => 100);
     $percents = array(array(10, new Rgb(200, 15, 15)), array(8, new Rgb(80, 5, 10)), array(12, new Rgb(80, 180, 100)), array(18, new Rgb(50, 125, 210)), array(22, new Rgb(80, 180, 10)), array(18, new Rgb(100, 125, 210)), array(12, new Rgb(80, 180, 10)));
     $this->setExpectedException('Pop\\Http\\Exception');
     $g = new Graph($this->pdfOptions);
     $g->addFont('Arial')->setFontColor(new Rgb(128, 128, 128))->showText(true)->createPieChart($pie, $percents, 20)->output();
 }