public function testGetNameFixed()
 {
     $this->productQuantityDiscount->setType(PromotionType::fixed());
     $this->productQuantityDiscount->setQuantity(10);
     $this->productQuantityDiscount->setValue(500);
     $this->assertSame('Buy 10 or more for $5.00 off', $this->productQuantityDiscount->getName());
 }