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#![cfg(feature="std")]
use snafu::{prelude::*, Backtrace, ErrorCompat};
type AnotherError = Box<dyn std::error::Error>;
#[derive(Debug, Snafu)]
enum Error {
#[snafu(display("Invalid user {}:\n{}", user_id, backtrace))]
InvalidUser { user_id: i32, backtrace: Backtrace },
WithSource {
source: AnotherError,
backtrace: Backtrace,
},
WithSourceAndOtherInfo {
user_id: i32,
source: AnotherError,
backtrace: Backtrace,
},
}
type Result<T, E = Error> = std::result::Result<T, E>;
fn example(user_id: i32) -> Result<()> {
ensure!(user_id >= 42, InvalidUserSnafu { user_id });
Ok(())
}
#[test]
fn display_can_access_backtrace() {
let e = example(0).unwrap_err();
let text = e.to_string();
assert!(
text.contains("disabled backtrace"),
"{:?} does not contain expected text",
text
);
}
fn trigger() -> Result<(), AnotherError> {
Err("boom".into())
}
#[test]
fn errors_with_sources_can_have_backtraces() {
let e = trigger().context(WithSourceSnafu).unwrap_err();
let backtrace = ErrorCompat::backtrace(&e).unwrap();
assert!(backtrace.to_string().contains("disabled backtrace"));
}
#[test]
fn errors_with_sources_and_other_info_can_have_backtraces() {
let e = trigger()
.context(WithSourceAndOtherInfoSnafu { user_id: 42 })
.unwrap_err();
let backtrace = ErrorCompat::backtrace(&e).unwrap();
assert!(backtrace.to_string().contains("disabled backtrace"));
}
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