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use snafu::prelude::*;
mod basics {
use super::*;
use std::sync::atomic::{AtomicUsize, Ordering};
static COUNTER: AtomicUsize = AtomicUsize::new(0);
#[derive(Debug)]
struct OccurrenceCount(usize);
impl snafu::GenerateImplicitData for OccurrenceCount {
fn generate() -> Self {
OccurrenceCount(COUNTER.fetch_add(1, Ordering::SeqCst))
}
}
#[derive(Debug, Snafu)]
enum ErrorOne {
Alpha {
#[snafu(implicit)]
occurrence: OccurrenceCount,
},
}
#[test]
fn implicit_fields_are_constructed() {
let ErrorOne::Alpha {
occurrence: OccurrenceCount(o1),
} = AlphaSnafu.build();
let ErrorOne::Alpha {
occurrence: OccurrenceCount(o2),
} = AlphaSnafu.build();
assert_eq!(o1, 0);
assert_eq!(o2, 1);
}
}
mod multiple_fields {
use super::*;
#[derive(Debug, PartialEq)]
struct ImplicitData;
impl snafu::GenerateImplicitData for ImplicitData {
fn generate() -> Self {
ImplicitData
}
}
#[derive(Debug, Snafu)]
struct Error {
#[snafu(implicit)]
one: ImplicitData,
#[snafu(implicit)]
two: ImplicitData,
}
#[test]
fn multiple_implicit_fields_are_constructed() {
let Error { one, two } = Snafu.build();
assert_eq!(one, two);
}
}
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