/** * Method to test walk() * * @return void * * @covers Windwalker\Data\DataSet::walk */ public function testWalk() { $this->instance->walk(function (&$data, $key, $userdata) { $data->foo = $userdata . ':' . $key; }, 'prefix'); $this->assertEquals(array('prefix:0', 'prefix:1'), $this->instance->foo); }