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An amount above 2^53 is not the amount that was given #5

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14 changes: 14 additions & 0 deletions tests/amount_precision.rs
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//! ISO 20022 allows an amount 18 significant digits. f64 carries 15.

use mx_message::document::camt_053_001_08::ActiveOrHistoricCurrencyAndAmount;

#[test]
fn an_eighteen_digit_amount_is_not_rounded() {
let xml = r#"<Amt Ccy="KZT">123456789012345678</Amt>"#;
let amt: ActiveOrHistoricCurrencyAndAmount =
quick_xml::de::from_str(xml).expect("the amount parses");

// Nothing here is exotic: 18 digits is what the standard permits, and the
// nearest f64 to this one is 123456789012345680.
assert_eq!(amt.value.to_string(), "123456789012345678");
}