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extern crate rand_os;
use rand_os::rand_core::RngCore;
use rand_os::OsRng;
#[test]
fn test_os_rng() {
let mut r = OsRng::new().unwrap();
r.next_u32();
r.next_u64();
let mut v1 = [0u8; 1000];
r.fill_bytes(&mut v1);
let mut v2 = [0u8; 1000];
r.fill_bytes(&mut v2);
let mut n_diff_bits = 0;
for i in 0..v1.len() {
n_diff_bits += (v1[i] ^ v2[i]).count_ones();
}
// Check at least 1 bit per byte differs. p(failure) < 1e-1000 with random input.
assert!(n_diff_bits >= v1.len() as u32);
}
#[test]
fn test_os_rng_empty() {
let mut r = OsRng::new().unwrap();
let mut empty = [0u8; 0];
r.fill_bytes(&mut empty);
}
#[test]
fn test_os_rng_huge() {
let mut r = OsRng::new().unwrap();
let mut huge = [0u8; 100_000];
r.fill_bytes(&mut huge);
}
#[cfg(not(any(target_arch = "wasm32", target_arch = "asmjs")))]
#[test]
fn test_os_rng_tasks() {
use std::sync::mpsc::channel;
use std::thread;
let mut txs = vec!();
for _ in 0..20 {
let (tx, rx) = channel();
txs.push(tx);
thread::spawn(move|| {
// wait until all the tasks are ready to go.
rx.recv().unwrap();
// deschedule to attempt to interleave things as much
// as possible (XXX: is this a good test?)
let mut r = OsRng::new().unwrap();
thread::yield_now();
let mut v = [0u8; 1000];
for _ in 0..100 {
r.next_u32();
thread::yield_now();
r.next_u64();
thread::yield_now();
r.fill_bytes(&mut v);
thread::yield_now();
}
});
}
// start all the tasks
for tx in txs.iter() {
tx.send(()).unwrap();
}
}
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