public function testOffsetGet()
{
$expected = array('id' => 1, 'data' => 'data1');
$this->assertEqual($expected, $this->_recordSet[1]->to('array'));
$expected = array('id' => 2, 'data' => 'data2');
$this->assertEqual($expected, $this->_recordSet[2]->to('array'));
$expected = array('id' => 3, 'data' => 'data3');
$this->assertEqual($expected, $this->_recordSet[3]->to('array'));
$expected = array('id' => 4, 'data' => 'data4');
$this->assertEqual($expected, $this->_recordSet[4]->to('array'));
$expected = array('id' => 3, 'data' => 'data3');
$this->assertEqual($this->_records[2], $this->_recordSet[3]->to('array'));
$recordSet = new MockMultiKeyRecordSet();
$this->assertEqual(array(), $recordSet->data());
$this->assertNull($this->_recordSet[5]);
}