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#![cfg(feature="std")]
use snafu::{prelude::*, Backtrace, ErrorCompat};
#[derive(Debug, Snafu)]
enum Error {
BacktraceAlways { backtrace: Backtrace },
BacktraceSometimes { backtrace: Option<Backtrace> },
}
#[test]
fn bare_backtrace_is_always_present() {
let always = BacktraceAlwaysSnafu.build();
assert!(ErrorCompat::backtrace(&always).is_some());
}
#[test]
fn optional_backtrace_is_not_present_without_environment_variable() {
use std::env;
// The check requires RUST_BACKTRACE to be unset. Back up the
// current value of the environment variable and restore it
// afterwards. If we add more tests to this file that rely on
// environment variables, we should introduce a mutex as
// environment variables are a global resource.
const BACKTRACE_ENV_NAME: &str = "RUST_BACKTRACE";
let previous_backtrace_env_value = env::var_os(BACKTRACE_ENV_NAME);
env::remove_var(BACKTRACE_ENV_NAME);
let sometimes = BacktraceSometimesSnafu.build();
assert!(ErrorCompat::backtrace(&sometimes).is_none());
if let Some(v) = previous_backtrace_env_value {
env::set_var(BACKTRACE_ENV_NAME, v);
}
}
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