nanobook/
error.rs

1//! Validation errors for order submission.
2
3use std::fmt;
4
5/// Errors returned by validated order submission methods.
6#[derive(Clone, Copy, Debug, PartialEq, Eq)]
7#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
8pub enum ValidationError {
9    /// Quantity must be greater than zero.
10    ZeroQuantity,
11    /// Price must be greater than zero for limit orders.
12    ZeroPrice,
13}
14
15impl fmt::Display for ValidationError {
16    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
17        match self {
18            ValidationError::ZeroQuantity => write!(f, "quantity must be greater than zero"),
19            ValidationError::ZeroPrice => write!(f, "price must be greater than zero"),
20        }
21    }
22}
23
24impl std::error::Error for ValidationError {}
25
26#[cfg(test)]
27mod tests {
28    use super::*;
29
30    #[test]
31    fn display() {
32        assert_eq!(
33            format!("{}", ValidationError::ZeroQuantity),
34            "quantity must be greater than zero"
35        );
36        assert_eq!(
37            format!("{}", ValidationError::ZeroPrice),
38            "price must be greater than zero"
39        );
40    }
41
42    #[test]
43    fn is_error() {
44        let err: Box<dyn std::error::Error> = Box::new(ValidationError::ZeroQuantity);
45        assert!(err.to_string().contains("quantity"));
46    }
47}
nanobook/error.rs

nanobook/
error.rs
