public function testPieChart()
{
$chart = GooglePieChart::create()->setSize(GoogleChartSize::create()->setWidth(500)->setHeight(300))->addPiece(GoogleChartPiece::create()->setTitle('Nokia')->setColor(Color::create('ff0000'))->setValue(40))->addPiece(GoogleChartPiece::create()->setTitle('Samsung')->setColor(Color::create('336677'))->setValue(35))->addPiece(GoogleChartPiece::create()->setTitle('Opera')->setColor(Color::create('112200'))->setValue(25));
$this->assertEquals($chart->toString(), 'http://chart.apis.google.com/chart?cht=p&chs=500x300&chco=FF0000,336677,112200&chd=t:40,35,25&chl=Nokia|Samsung|Opera');
}