76 lines
2.1 KiB
Rust
76 lines
2.1 KiB
Rust
use rand_core::{RngCore, SeedableRng};
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use rand_pcg::{Mcg128Xsl64, Pcg64Mcg};
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#[test]
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fn test_mcg128xsl64_advancing() {
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for seed in 0..20 {
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let mut rng1 = Mcg128Xsl64::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_mcg128xsl64_construction() {
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// Test that various construction techniques produce a working RNG.
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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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let mut rng1 = Mcg128Xsl64::from_seed(seed);
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assert_eq!(rng1.next_u64(), 7071994460355047496);
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let mut rng2 = Mcg128Xsl64::from_rng(&mut rng1);
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assert_eq!(rng2.next_u64(), 12300796107712034932);
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let mut rng3 = Mcg128Xsl64::seed_from_u64(0);
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assert_eq!(rng3.next_u64(), 6198063878555692194);
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// This is the same as Mcg128Xsl64, so we only have a single test:
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let mut rng4 = Pcg64Mcg::seed_from_u64(0);
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assert_eq!(rng4.next_u64(), 6198063878555692194);
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}
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#[test]
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fn test_mcg128xsl64_reference() {
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// Numbers copied from official test suite (C version).
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let mut rng = Mcg128Xsl64::new(42);
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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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0x63b4a3a813ce700a,
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0x382954200617ab24,
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0xa7fd85ae3fe950ce,
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0xd715286aa2887737,
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0x60c92fee2e59f32c,
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0x84c4e96beff30017,
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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_mcg128xsl64_serde() {
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use bincode;
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use std::io::{BufReader, BufWriter};
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let mut rng = Mcg128Xsl64::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: Mcg128Xsl64 =
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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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