mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-23 06:42:23 +00:00
66 lines
1.4 KiB
Rust
66 lines
1.4 KiB
Rust
//! Sanity check that alternate hashers work correctly.
|
|
|
|
#![cfg(not(miri))] // FIXME: takes too long
|
|
|
|
use hashbrown::HashSet;
|
|
use std::hash::{BuildHasher, BuildHasherDefault, Hasher};
|
|
|
|
fn check<S: BuildHasher + Default>() {
|
|
let range = 0..1_000;
|
|
|
|
let mut set = HashSet::<i32, S>::default();
|
|
set.extend(range.clone());
|
|
|
|
assert!(!set.contains(&i32::min_value()));
|
|
assert!(!set.contains(&(range.start - 1)));
|
|
for i in range.clone() {
|
|
assert!(set.contains(&i));
|
|
}
|
|
assert!(!set.contains(&range.end));
|
|
assert!(!set.contains(&i32::max_value()));
|
|
}
|
|
|
|
/// Use hashbrown's default hasher.
|
|
#[test]
|
|
fn default() {
|
|
check::<hashbrown::hash_map::DefaultHashBuilder>();
|
|
}
|
|
|
|
/// Use std's default hasher.
|
|
#[test]
|
|
fn random_state() {
|
|
check::<std::collections::hash_map::RandomState>();
|
|
}
|
|
|
|
/// Use a constant 0 hash.
|
|
#[test]
|
|
fn zero() {
|
|
#[derive(Default)]
|
|
struct ZeroHasher;
|
|
|
|
impl Hasher for ZeroHasher {
|
|
fn finish(&self) -> u64 {
|
|
0
|
|
}
|
|
fn write(&mut self, _: &[u8]) {}
|
|
}
|
|
|
|
check::<BuildHasherDefault<ZeroHasher>>();
|
|
}
|
|
|
|
/// Use a constant maximum hash.
|
|
#[test]
|
|
fn max() {
|
|
#[derive(Default)]
|
|
struct MaxHasher;
|
|
|
|
impl Hasher for MaxHasher {
|
|
fn finish(&self) -> u64 {
|
|
u64::max_value()
|
|
}
|
|
fn write(&mut self, _: &[u8]) {}
|
|
}
|
|
|
|
check::<BuildHasherDefault<MaxHasher>>();
|
|
}
|