public function testOffsetExists() {
		$this->assertFalse($this->_recordSet->offsetExists(0));
		$this->assertTrue($this->_recordSet->offsetExists(1));
		$this->assertTrue($this->_recordSet->offsetExists(2));
		$this->assertTrue($this->_recordSet->offsetExists(3));
		$this->assertTrue($this->_recordSet->offsetExists(4));

		$this->assertTrue(isset($this->_recordSet[3]));

		$this->assertFalse($this->_objectRecordSet->offsetExists(0));
		$this->assertTrue($this->_objectRecordSet->offsetExists(1));
		$this->assertTrue($this->_objectRecordSet->offsetExists(2));
		$this->assertTrue($this->_objectRecordSet->offsetExists(3));
		$this->assertTrue($this->_objectRecordSet->offsetExists(4));
		$this->assertTrue(isset($this->_objectRecordSet[3]));
	}