78 lines
2.2 KiB
Rust
78 lines
2.2 KiB
Rust
use rand_core::{RngCore, SeedableRng};
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use rand_pcg::{Lcg128Xsl64, Pcg64};
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#[test]
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fn test_lcg128xsl64_advancing() {
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for seed in 0..20 {
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let mut rng1 = Lcg128Xsl64::seed_from_u64(seed);
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let mut rng2 = rng1.clone();
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for _ in 0..20 {
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rng1.next_u64();
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}
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rng2.advance(20);
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assert_eq!(rng1, rng2);
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}
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}
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#[test]
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fn test_lcg128xsl64_construction() {
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// Test that various construction techniques produce a working RNG.
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#[rustfmt::skip]
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let seed = [1,2,3,4, 5,6,7,8, 9,10,11,12, 13,14,15,16,
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17,18,19,20, 21,22,23,24, 25,26,27,28, 29,30,31,32];
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let mut rng1 = Lcg128Xsl64::from_seed(seed);
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assert_eq!(rng1.next_u64(), 8740028313290271629);
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let mut rng2 = Lcg128Xsl64::from_rng(&mut rng1);
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assert_eq!(rng2.next_u64(), 1922280315005786345);
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let mut rng3 = Lcg128Xsl64::seed_from_u64(0);
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assert_eq!(rng3.next_u64(), 2354861276966075475);
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// This is the same as Lcg128Xsl64, so we only have a single test:
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let mut rng4 = Pcg64::seed_from_u64(0);
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assert_eq!(rng4.next_u64(), 2354861276966075475);
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}
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#[test]
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fn test_lcg128xsl64_reference() {
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// Numbers copied from official test suite (C version).
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let mut rng = Lcg128Xsl64::new(42, 54);
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let mut results = [0u64; 6];
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for i in results.iter_mut() {
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*i = rng.next_u64();
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}
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let expected: [u64; 6] = [
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0x86b1da1d72062b68,
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0x1304aa46c9853d39,
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0xa3670e9e0dd50358,
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0xf9090e529a7dae00,
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0xc85b9fd837996f2c,
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0x606121f8e3919196,
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];
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assert_eq!(results, expected);
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}
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#[cfg(feature = "serde1")]
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#[test]
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fn test_lcg128xsl64_serde() {
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use bincode;
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use std::io::{BufReader, BufWriter};
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let mut rng = Lcg128Xsl64::seed_from_u64(0);
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let buf: Vec<u8> = Vec::new();
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let mut buf = BufWriter::new(buf);
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bincode::serialize_into(&mut buf, &rng).expect("Could not serialize");
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let buf = buf.into_inner().unwrap();
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let mut read = BufReader::new(&buf[..]);
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let mut deserialized: Lcg128Xsl64 =
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bincode::deserialize_from(&mut read).expect("Could not deserialize");
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for _ in 0..16 {
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assert_eq!(rng.next_u64(), deserialized.next_u64());
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}
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}
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