817a41c4dc
This PR adds a new `Cents` type that can be used to represent a monetary value in cents. This cuts down on the primitive obsession we were using when dealing with money in the billing code. Release Notes: - N/A
78 lines
1.5 KiB
Rust
78 lines
1.5 KiB
Rust
/// A number of cents.
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#[derive(
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Debug,
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PartialEq,
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Eq,
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PartialOrd,
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Ord,
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Hash,
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Clone,
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Copy,
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derive_more::Add,
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derive_more::AddAssign,
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)]
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pub struct Cents(pub u32);
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impl Cents {
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pub const ZERO: Self = Self(0);
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pub const fn new(cents: u32) -> Self {
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Self(cents)
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}
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pub const fn from_dollars(dollars: u32) -> Self {
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Self(dollars * 100)
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}
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pub fn saturating_sub(self, other: Cents) -> Self {
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Self(self.0.saturating_sub(other.0))
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}
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}
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#[cfg(test)]
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mod tests {
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use pretty_assertions::assert_eq;
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use super::*;
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#[test]
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fn test_cents_new() {
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assert_eq!(Cents::new(50), Cents(50));
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}
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#[test]
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fn test_cents_from_dollars() {
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assert_eq!(Cents::from_dollars(1), Cents(100));
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assert_eq!(Cents::from_dollars(5), Cents(500));
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}
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#[test]
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fn test_cents_zero() {
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assert_eq!(Cents::ZERO, Cents(0));
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}
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#[test]
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fn test_cents_add() {
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assert_eq!(Cents(50) + Cents(30), Cents(80));
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}
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#[test]
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fn test_cents_add_assign() {
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let mut cents = Cents(50);
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cents += Cents(30);
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assert_eq!(cents, Cents(80));
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}
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#[test]
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fn test_cents_saturating_sub() {
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assert_eq!(Cents(50).saturating_sub(Cents(30)), Cents(20));
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assert_eq!(Cents(30).saturating_sub(Cents(50)), Cents(0));
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}
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#[test]
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fn test_cents_ordering() {
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assert!(Cents(50) > Cents(30));
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assert!(Cents(30) < Cents(50));
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assert_eq!(Cents(50), Cents(50));
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}
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}
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