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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.",
);
}