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lib.rs
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lib.rs
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#![cfg(test)]
#![feature(error_generic_member_access, provide_any)]
use snafu::{prelude::*, Report};
use std::process::ExitCode;
#[test]
fn provided_exit_code_is_returned() {
use std::process::Termination;
#[derive(Debug, Snafu)]
enum TwoKindError {
#[snafu(provide(ExitCode => ExitCode::from(2)))]
Mild,
#[snafu(provide(ExitCode => ExitCode::from(3)))]
Extreme,
}
let mild = Report::from_error(MildSnafu.build()).report();
let expected_mild = ExitCode::from(2);
assert!(
nasty_hack_exit_code_eq(mild, expected_mild),
"Wanted {:?} but got {:?}",
expected_mild,
mild,
);
let extreme = Report::from_error(ExtremeSnafu.build()).report();
let expected_extreme = ExitCode::from(3);
assert!(
nasty_hack_exit_code_eq(extreme, expected_extreme),
"Wanted {:?} but got {:?}",
expected_extreme,
extreme,
);
}
#[test]
fn provided_backtrace_is_printed() {
#[derive(Debug, Snafu)]
struct Error {
backtrace: snafu::Backtrace,
}
let r = Report::from_error(Snafu.build());
let msg = r.to_string();
let this_function = "::provided_backtrace_is_printed";
assert!(
msg.contains(this_function),
"Expected {msg:?} to contain {this_function:?}"
);
}
fn nasty_hack_exit_code_eq(left: ExitCode, right: ExitCode) -> bool {
use std::mem;
let (left, right): (u8, u8) = unsafe {
assert_eq!(mem::size_of::<u8>(), mem::size_of::<ExitCode>());
(mem::transmute(left), mem::transmute(right))
};
left == right
}