public function testNextRewindCurrent() {
		$collection = new DocumentSet();
		$collection->set(array(
			'title' => 'Lorem Ipsum',
			'value' => 42,
			'foo'   => 'bar'
		));
		$this->assertEqual('Lorem Ipsum', $collection->current());
		$this->assertEqual(42, $collection->next());
		$this->assertEqual('bar', $collection->next());
		$this->assertEqual('Lorem Ipsum', $collection->rewind());
		$this->assertEqual(42, $collection->next());
	}