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Author SHA1 Message Date
Marcel Enguehard
d812434827 Add zero known-answer test for Euros 
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
 2026-07-30 11:26:04 +02:00
Marcel Enguehard
68a9088ec4 Add Euros money type backed by integer cents 
Store amounts as i64 cents rather than a Decimal, so the "scale is 2"
invariant is structural instead of maintained by hand. Both accessors are
total: as_cents is a field read, as_decimal derives the Decimal on demand.
i64 rather than u64 because differences between amounts can be negative.

Add rust_decimal, verified to build for wasm32-unknown-unknown with default
features. Allow clippy::inconsistent_digit_grouping in immo-core so cent
literals can be grouped as euros-then-cents.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
 2026-07-30 11:22:41 +02:00
4 changed files with 732 additions and 14 deletions
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4
crates/immo-core/Cargo.toml
View file

@ -5,3 +5,7 @@ edition.workspace = true
rust-version.workspace = true rust-version.workspace = true
[dependencies] [dependencies]
rust_decimal = "1.42.1"
[lints.clippy]
inconsistent_digit_grouping = "allow"

82
crates/immo-core/src/euros.rs Normal file
View file

@ -0,0 +1,82 @@
use rust_decimal::Decimal;
#[derive(PartialOrd, PartialEq, Ord, Eq, Clone, Copy, Debug)]
pub struct Euros {
value_as_cents: i64,
}
impl Euros {
pub const fn from_cents(value_as_cents: i64) -> Self {
Euros { value_as_cents }
}
pub const fn as_cents(self) -> i64 {
self.value_as_cents
}
pub fn as_decimal(self) -> Decimal {
Decimal::new(self.value_as_cents, 2)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn from_cents_to_euros_to_cents_stays_equals() {
let euros = Euros::from_cents(123_456_00);
assert_eq!(euros.as_cents(), 123_456_00);
}
#[test]
fn from_positive_cents_to_decimal_has_scale_2_and_correct_mantissa() {
let euros = Euros::from_cents(123_456_78);
assert_eq!(
euros.as_decimal().scale(),
2,
"Euros should have a scale of 2"
);
assert_eq!(
euros.as_decimal().mantissa(),
123_456_78,
"Mantissa should be equal to value_as_cents"
);
}
#[test]
fn from_negative_cents_to_decimal_has_correct_scale_and_mantissa() {
let euros = Euros::from_cents(-123_456_78);
assert_eq!(
euros.as_decimal().scale(),
2,
"Euros should have a scale of 2"
);
assert_eq!(
euros.as_decimal().mantissa(),
-123_456_78,
"Mantissa should be equal to value_as_cents"
);
}
#[test]
fn from_max_i64_cents_to_decimal_has_correct_scale_and_mantissa() {
let euros = Euros::from_cents(i64::MAX);
assert_eq!(
euros.as_decimal().scale(),
2,
"Euros should have a scale of 2"
);
assert_eq!(
euros.as_decimal().mantissa(),
i64::MAX.into(),
"Mantissa should be equal to i64::MAX"
);
}
#[test]
fn from_0_cents_to_decimal_stays_zero() {
let euros = Euros::from_cents(0);
assert_eq!(euros.as_decimal(), Decimal::ZERO);
}
}

15
crates/immo-core/src/lib.rs
View file

@ -1,14 +1 @@
pub fn add(left: u64, right: u64) -> u64 { pub mod euros;
left + right
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn it_works() {
let result = add(2, 2);
assert_eq!(result, 4);
}
}