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use snafu::prelude::*;
use std::fmt::Debug;
#[derive(Debug, Clone, Snafu)]
enum LeafError {
#[snafu(display("User ID {} is invalid", user_id))]
InvalidUser { user_id: i32 },
#[snafu(display("no user available"))]
MissingUser,
}
#[derive(Debug, Clone, Snafu)]
enum MiddleError {
#[snafu(display("failed to check the user"))]
CheckUser { source: LeafError },
}
#[derive(Debug, Clone, Snafu)]
enum Error {
#[snafu(display("access control failure"))]
AccessControl { source: MiddleError },
}
#[track_caller]
fn assert_eq_debug(a: impl Debug, b: impl Debug) {
assert_eq!(format!("{:?}", a), format!("{:?}", b));
}
#[cfg(feature="std")]
#[test]
fn chain_compat_iterates() {
use snafu::{ChainCompat, IntoError};
let bottom_error = InvalidUserSnafu { user_id: 12 }.build();
let middle_error = CheckUserSnafu.into_error(bottom_error.clone());
let error = AccessControlSnafu.into_error(middle_error.clone());
let errors: Vec<_> = ChainCompat::new(&error).collect();
assert_eq_debug(&errors[0], &error);
assert_eq_debug(&errors[1], &middle_error);
assert_eq_debug(&errors[2], &bottom_error);
}
#[cfg(feature="std")]
#[test]
fn errorcompat_chain_iterates() {
use snafu::{ErrorCompat, IntoError};
let bottom_error = InvalidUserSnafu { user_id: 12 }.build();
let middle_error = CheckUserSnafu.into_error(bottom_error.clone());
let error = AccessControlSnafu.into_error(middle_error.clone());
let errors: Vec<_> = ErrorCompat::iter_chain(&error).collect();
assert_eq_debug(&errors[0], &error);
assert_eq_debug(&errors[1], &middle_error);
assert_eq_debug(&errors[2], &bottom_error);
}
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