public function testGetNext()
{
$col = new Collection();
$this->assertNull($col->getNext(), 'getNext() returns null on an empty collection');
$data = array('bar1', 'bar2', 'bar3');
$col = new Collection($data);
$this->assertEquals('bar2', $col->getNext(), 'getNext() returns the second element when the internal pointer is at the beginning of the list');
$this->assertEquals('bar2', $col->getCurrent(), 'getNext() increments the internal pointer');
$col->getNext();
$this->assertNull($col->getNext(), 'getNext() returns null when the internal pointer is at the end of the list');
}
