/**
  * @covers Core\Entity\StudentGrade::setCreatedAt
  * @covers Core\Entity\StudentGrade::getCreatedAt
  */
 public function testSetGetCreatedAt()
 {
     $dt = new DateTime();
     $this->studentGrade->setCreatedAt($dt);
     $this->assertEquals($dt, $this->studentGrade->getCreatedAt());
 }