public function testSetSalutation()
 {
     $card = new CreditCard();
     $this->assertEmpty($card->getSalutation());
     $this->assertEmpty($card->getBillingSalutation());
     $this->assertEmpty($card->getShippingSalutation());
     $value = uniqid();
     $this->assertSame($card, $card->setSalutation($value));
     $this->assertSame($value, $card->getSalutation());
     $this->assertSame($value, $card->getBillingSalutation());
     $this->assertSame($value, $card->getShippingSalutation());
     $this->assertSame($card, $card->setSalutation(null));
     $this->assertEmpty($card->getSalutation());
     $this->assertEmpty($card->getBillingSalutation());
     $this->assertEmpty($card->getShippingSalutation());
 }