lib

Core libraries for Radroots
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discount.rs (2229B)

      1 mod common;
      2 
      3 use radroots_core::{
      4     Percent, Unit,
      5     pricing::{Discount, DiscountError, DiscountScope, DiscountThreshold, DiscountValue},
      6 };
      7 
      8 #[test]
      9 fn checked_constructor_rejects_negative_percent_values() {
     10     let negative_value = Discount::try_new(
     11         DiscountScope::Bin,
     12         DiscountThreshold::BinCount {
     13             bin_id: "bin-1".to_string(),
     14             min: 1,
     15         },
     16         DiscountValue::Percent(Percent::new(common::dec("-0.01"))),
     17     );
     18     assert_eq!(negative_value, Err(DiscountError::NegativeValue));
     19 }
     20 
     21 #[test]
     22 fn checked_constructor_and_accessors_preserve_valid_shape() {
     23     let discount = Discount::try_new(
     24         DiscountScope::Bin,
     25         DiscountThreshold::BinCount {
     26             bin_id: "bin-1".to_string(),
     27             min: 2,
     28         },
     29         DiscountValue::MoneyPerBin(common::money("1.25", "USD")),
     30     )
     31     .unwrap();
     32     assert_eq!(discount.scope(), &DiscountScope::Bin);
     33     assert!(matches!(
     34         discount.threshold(),
     35         DiscountThreshold::BinCount { min: 2, .. }
     36     ));
     37     assert!(matches!(discount.value(), DiscountValue::MoneyPerBin(_)));
     38     assert_eq!(discount.validate(), Ok(()));
     39     assert!(discount.is_non_negative());
     40 }
     41 
     42 #[test]
     43 fn order_quantity_and_positive_percent_cover_the_alternate_valid_shape() {
     44     let discount = Discount::try_new(
     45         DiscountScope::OrderTotal,
     46         DiscountThreshold::OrderQuantity {
     47             min: common::qty("2", Unit::Each),
     48         },
     49         DiscountValue::Percent(Percent::new(common::dec("12.5"))),
     50     )
     51     .unwrap();
     52 
     53     assert_eq!(discount.scope(), &DiscountScope::OrderTotal);
     54     assert!(matches!(
     55         discount.threshold(),
     56         DiscountThreshold::OrderQuantity { min } if min.amount() == common::dec("2")
     57     ));
     58     assert!(
     59         matches!(discount.value(), DiscountValue::Percent(percent) if percent.value() == common::dec("12.5"))
     60     );
     61     assert_eq!(discount.validate(), Ok(()));
     62 }
     63 
     64 #[test]
     65 fn discount_error_messages_are_stable() {
     66     assert_eq!(
     67         DiscountError::NegativeThreshold.to_string(),
     68         "discount threshold must be non-negative"
     69     );
     70     assert_eq!(
     71         DiscountError::NegativeValue.to_string(),
     72         "discount value must be non-negative"
     73     );
     74 }