File: backtrace-optional-enabled.rs

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rust-snafu 0.7.5-2
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#![cfg(feature="std")]
use snafu::{prelude::*, Backtrace, ErrorCompat};

#[derive(Debug, Snafu)]
enum Error {
    BacktraceSometimes { backtrace: Option<Backtrace> },
}

#[test]
fn optional_backtrace_is_present_with_environment_variable() {
    std::env::set_var("RUST_LIB_BACKTRACE", "1");
    let sometimes = BacktraceSometimesSnafu.build();
    assert!(ErrorCompat::backtrace(&sometimes).is_some());
}