65 lines
2.2 KiB
Rust
65 lines
2.2 KiB
Rust
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)
|
|
}
|