Function serde_test::assert_ser_tokens_error

pub fn assert_ser_tokens_error<T>(value: &T, tokens: &[Token], error: &str) where
    T: Serialize, 

Asserts that value serializes to the given tokens, and then yields error.

use std::sync::{Arc, Mutex};
use std::thread;

use serde_test::{assert_ser_tokens_error, Token};

#[derive(Serialize)]
struct Example {
    lock: Arc<Mutex<u32>>,
}

let example = Example { lock: Arc::new(Mutex::new(0)) };
let lock = example.lock.clone();

let _ = thread::spawn(move || {
    // This thread will acquire the mutex first, unwrapping the result
    // of `lock` because the lock has not been poisoned.
    let _guard = lock.lock().unwrap();

    // This panic while holding the lock (`_guard` is in scope) will
    // poison the mutex.
    panic!()
}).join();

let expected = &[
    Token::Struct { name: "Example", len: 1 },
    Token::Str("lock"),
];
let error = "lock poison error while serializing";
assert_ser_tokens_error(&example, expected, error);