public function testGetSetSigningOnBehalfDate()
 {
     $expectedDate = new \DateTime();
     $expectedDateString = $expectedDate->format(OPGDateFormat::getDateFormat());
     $this->assertTrue($this->poa->setSigningOnBehalfDate() instanceof PowerOfAttorney);
     $this->assertEmpty($this->poa->getSigningOnBehalfDate());
     $this->assertTrue($this->poa->setSigningOnBehalfDateString('') instanceof PowerOfAttorney);
     $this->assertEmpty($this->poa->getSigningOnBehalfDateString());
     $this->assertTrue($this->poa->setSigningOnBehalfDate($expectedDate) instanceof PowerOfAttorney);
     $this->assertEquals($expectedDate, $this->poa->getSigningOnBehalfDate());
     $this->assertEquals($expectedDateString, $this->poa->getSigningOnBehalfDateString());
     $this->assertTrue($this->poa->setSigningOnBehalfDateString($expectedDateString) instanceof PowerOfAttorney);
     $this->assertEquals($expectedDateString, $this->poa->getSigningOnBehalfDateString());
 }