public function testSetCreatedAt()
 {
     $createdAt = '2013-02-28 13:05:00';
     $this->module->setCreatedAt($createdAt);
     $this->assertSame($createdAt, $this->module->getCreatedAt());
     $this->assertEquals(new DateTime($createdAt), $this->module->getCreatedAtDateTime());
 }