use std::env::*;
use std::ffi::{OsStr, OsString};
-use rand::distributions::Alphanumeric;
-use rand::{thread_rng, Rng};
+use rand::distributions::{Alphanumeric, DistString};
+
+/// Copied from `std::test_helpers::test_rng`, since these tests rely on the
+/// seed not being the same for every RNG invocation too.
+#[track_caller]
+pub(crate) fn test_rng() -> rand_xorshift::XorShiftRng {
+ use core::hash::{BuildHasher, Hash, Hasher};
+ let mut hasher = std::collections::hash_map::RandomState::new().build_hasher();
+ core::panic::Location::caller().hash(&mut hasher);
+ let hc64 = hasher.finish();
+ let seed_vec = hc64.to_le_bytes().into_iter().chain(0u8..8).collect::<Vec<u8>>();
+ let seed: [u8; 16] = seed_vec.as_slice().try_into().unwrap();
+ rand::SeedableRng::from_seed(seed)
+}
+#[track_caller]
fn make_rand_name() -> OsString {
- let rng = thread_rng();
- let n = format!("TEST{}", rng.sample_iter(&Alphanumeric).take(10).collect::<String>());
+ let n = format!("TEST{}", Alphanumeric.sample_string(&mut test_rng(), 10));
let n = OsString::from(n);
assert!(var_os(&n).is_none());
n