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Add tests for PRNG value stability

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This commit is contained in:
Josh Stone 2018-07-02 11:09:07 -07:00
parent b2c9577f63
commit 8b5a092010
1 changed files with 142 additions and 2 deletions
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144
tests/rand.rs
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@ -8,7 +8,7 @@ mod biguint {
use num_bigint::{BigUint, RandBigInt, RandomBits};
use num_traits::Zero;
use rand::thread_rng;
use rand::Rng;
use rand::{Rng, SeedableRng};
use rand::distributions::Uniform;
#[test]
@ -89,13 +89,83 @@ mod biguint {
assert!(n < u);
}
}
fn seeded_value_stability<R: SeedableRng + RandBigInt>(expected: &[&str]) {
let mut seed = <R::Seed>::default();
for (i, x) in seed.as_mut().iter_mut().enumerate() {
*x = (i as u8).wrapping_mul(191);
}
let mut rng = R::from_seed(seed);
for (i, &s) in expected.iter().enumerate() {
let n: BigUint = s.parse().unwrap();
let r = rng.gen_biguint((1 << i) + i);
assert_eq!(n, r);
}
}
#[test]
fn test_chacha_value_stability() {
const EXPECTED: &[&str] = &[
"0",
"0",
"52",
"84",
"23780",
"86502865016",
"187057847319509867386",
"34045731223080904464438757488196244981910",
"23813754422987836414755953516143692594193066497413249270287126597896871975915808",
"57401636903146945411652549098818446911814352529449356393690984105383482703074355\
67088360974672291353736011718191813678720755501317478656550386324355699624671",
];
use rand::prng::ChaChaRng;
seeded_value_stability::<ChaChaRng>(EXPECTED);
}
#[test]
fn test_isaac_value_stability() {
const EXPECTED: &[&str] = &[
"1",
"4",
"3",
"649",
"89116",
"7730042024",
"20773149082453254949",
"35999009049239918667571895439206839620281",
"10191757312714088681302309313551624007714035309632506837271600807524767413673006",
"37805949268912387809989378008822038725134260145886913321084097194957861133272558\
43458183365174899239251448892645546322463253898288141861183340823194379722556",
];
use rand::prng::IsaacRng;
seeded_value_stability::<IsaacRng>(EXPECTED);
}
#[test]
fn test_xorshift_value_stability() {
const EXPECTED: &[&str] = &[
"1",
"0",
"37",
"395",
"181116",
"122718231117",
"1068467172329355695001",
"28246925743544411614293300167064395633287",
"12750053187017853048648861493745244146555950255549630854523304068318587267293038",
"53041498719137109355568081064978196049094604705283682101683207799515709404788873\
53417136457745727045473194367732849819278740266658219147356315674940229288531",
];
use rand::prng::XorShiftRng;
seeded_value_stability::<XorShiftRng>(EXPECTED);
}
}
mod bigint {
use num_bigint::{BigInt, RandBigInt, RandomBits};
use num_traits::Zero;
use rand::thread_rng;
use rand::Rng;
use rand::{Rng, SeedableRng};
use rand::distributions::Uniform;
#[test]
@ -181,4 +251,74 @@ mod bigint {
check(-l.clone(), u.clone());
check(-u.clone(), -l.clone());
}
fn seeded_value_stability<R: SeedableRng + RandBigInt>(expected: &[&str]) {
let mut seed = <R::Seed>::default();
for (i, x) in seed.as_mut().iter_mut().enumerate() {
*x = (i as u8).wrapping_mul(191);
}
let mut rng = R::from_seed(seed);
for (i, &s) in expected.iter().enumerate() {
let n: BigInt = s.parse().unwrap();
let r = rng.gen_bigint((1 << i) + i);
assert_eq!(n, r);
}
}
#[test]
fn test_chacha_value_stability() {
const EXPECTED: &[&str] = &[
"0",
"-6",
"-1",
"1321",
"-147247",
"8486373526",
"-272736656290199720696",
"2731152629387534140535423510744221288522",
"-28820024790651190394679732038637785320661450462089347915910979466834461433196572",
"501454570554170484799723603981439288209930393334472085317977614690773821680884844\
8530978478667288338327570972869032358120588620346111979053742269317702532328",
];
use rand::prng::ChaChaRng;
seeded_value_stability::<ChaChaRng>(EXPECTED);
}
#[test]
fn test_isaac_value_stability() {
const EXPECTED: &[&str] = &[
"1",
"0",
"5",
"113",
"-132240",
"-36348760761",
"-365690596708430705434",
"-14090753008246284277803606722552430292432",
"-26313941628626248579319341019368550803676255307056857978955881718727601479436059",
"-14563174552421101848999036239003801073335703811160945137332228646111920972691151\
88341090358094331641182310792892459091016794928947242043358702692294695845817",
];
use rand::prng::IsaacRng;
seeded_value_stability::<IsaacRng>(EXPECTED);
}
#[test]
fn test_xorshift_value_stability() {
const EXPECTED: &[&str] = &[
"-1",
"-4",
"11",
"-1802",
"966495",
"-62592045703",
"-602281783447192077116",
"-34335811410223060575607987996861632509125",
"29156580925282215857325937227200350542000244609280383263289720243118706105351199",
"49920038676141573457451407325930326489996232208489690499754573826911037849083623\
24546142615325187412887314466195222441945661833644117700809693098722026764846",
];
use rand::prng::XorShiftRng;
seeded_value_stability::<XorShiftRng>(EXPECTED);
}
}