double_init_fail.rs

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use rayon_core::ThreadPoolBuilder;

use std::error::Error;

#[test]

#[cfg_attr(any(target_os = "emscripten", target_family = "wasm"), ignore)]

fn double_init_fail() {

    let result1 = ThreadPoolBuilder::new().build_global();

    assert!(result1.is_ok());

    let err = ThreadPoolBuilder::new().build_global().unwrap_err();

    assert!(err.source().is_none());

    assert_eq!(

        err.to_string(),

        "The global thread pool has already been initialized.",

);