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use rand::{RngCore, SeedableRng};
use crate::hash::{BuildHasher, Hash, Hasher, RandomState};
use crate::panic::Location;
use crate::path::{Path, PathBuf};
use crate::{env, fs, thread};
/// Test-only replacement for `rand::thread_rng()`, which is unusable for
/// us, as we want to allow running stdlib tests on tier-3 targets which may
/// not have `getrandom` support.
///
/// Does a bit of a song and dance to ensure that the seed is different on
/// each call (as some tests sadly rely on this), but doesn't try that hard.
///
/// This is duplicated in the `core`, `alloc` test suites (as well as
/// `std`'s integration tests), but figuring out a mechanism to share these
/// seems far more painful than copy-pasting a 7 line function a couple
/// times, given that even under a perma-unstable feature, I don't think we
/// want to expose types from `rand` from `std`.
#[track_caller]
pub(crate) fn test_rng() -> rand_xorshift::XorShiftRng {
let mut hasher = RandomState::new().build_hasher();
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();
SeedableRng::from_seed(seed)
}
pub struct TempDir(PathBuf);
impl TempDir {
pub fn join(&self, path: &str) -> PathBuf {
let TempDir(ref p) = *self;
p.join(path)
}
pub fn path(&self) -> &Path {
let TempDir(ref p) = *self;
p
}
}
impl Drop for TempDir {
fn drop(&mut self) {
// Gee, seeing how we're testing the fs module I sure hope that we
// at least implement this correctly!
let TempDir(ref p) = *self;
let result = fs::remove_dir_all(p);
// Avoid panicking while panicking as this causes the process to
// immediately abort, without displaying test results.
if !thread::panicking() {
result.unwrap();
}
}
}
#[track_caller] // for `test_rng`
pub fn tmpdir() -> TempDir {
let p = env::temp_dir();
let mut r = test_rng();
let ret = p.join(&format!("rust-{}", r.next_u32()));
fs::create_dir(&ret).unwrap();
TempDir(ret)
}
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