public function testIsExpiredDueToExpirationDate()
 {
     $payment = new Payment($this->getInstruction(), 123);
     $this->assertFalse($payment->isExpired());
     $payment->setExpirationDate(new \DateTime('yesterday'));
     $this->assertTrue($payment->isExpired());
     $payment->setExpirationDate(new \DateTime('tomorrow'));
     $this->assertFalse($payment->isExpired());
 }