public function testDateCreated()
 {
     $expected = new \DateTime();
     $this->assertNull($this->item->getDateCreated());
     $this->assertSame($this->item, $this->item->setDateCreated($expected));
     $this->assertSame($expected, $this->item->getDateCreated());
     $this->item->setDateCreated('2010-01-01 00:00:00');
     $this->assertInstanceOf('DateTime', $this->item->getDateCreated());
 }