public function testGetSetCreatedDateEmptyString()
 {
     $expectedDate = new \DateTime();
     $this->correspondence->setDateTimeFromString(null, 'createdDate');
     $returnedDate = $this->correspondence->getCreatedDate();
     $this->assertEquals($expectedDate->format(OPGDateFormat::getDateTimeFormat()), $returnedDate->format(OPGDateFormat::getDateTimeFormat()));
 }