public function testRender() { $this->chart->setDataProvider(array(array('name' => 'Foo', 'value' => 1), array('name' => 'Bar', 'value' => 2), array('name' => 'Baz', 'value' => 3))); $this->chart->setTitleField('name')->setValueField('value')->setGroupPercent(5); $this->chart->legend()->text(array('align' => 'center')); $output = $this->chart->render(); $this->assertNotEquals(false, strpbrk($output, 'write')); }