| use rand_core::{RngCore, SeedableRng}; |
| use rand_pcg::{Lcg64Xsh32, Pcg32}; |
| |
| #[test] |
| fn test_lcg64xsh32_advancing() { |
| for seed in 0..20 { |
| let mut rng1 = Lcg64Xsh32::seed_from_u64(seed); |
| let mut rng2 = rng1.clone(); |
| for _ in 0..20 { |
| rng1.next_u32(); |
| } |
| rng2.advance(20); |
| assert_eq!(rng1, rng2); |
| } |
| } |
| |
| #[test] |
| fn test_lcg64xsh32_construction() { |
| // Test that various construction techniques produce a working RNG. |
| let seed = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]; |
| let mut rng1 = Lcg64Xsh32::from_seed(seed); |
| assert_eq!(rng1.next_u64(), 1204678643940597513); |
| |
| let mut rng2 = Lcg64Xsh32::from_rng(&mut rng1).unwrap(); |
| assert_eq!(rng2.next_u64(), 12384929573776311845); |
| |
| let mut rng3 = Lcg64Xsh32::seed_from_u64(0); |
| assert_eq!(rng3.next_u64(), 18195738587432868099); |
| |
| // This is the same as Lcg64Xsh32, so we only have a single test: |
| let mut rng4 = Pcg32::seed_from_u64(0); |
| assert_eq!(rng4.next_u64(), 18195738587432868099); |
| } |
| |
| #[test] |
| fn test_lcg64xsh32_reference() { |
| // Numbers copied from official test suite. |
| let mut rng = Lcg64Xsh32::new(42, 54); |
| |
| let mut results = [0u32; 6]; |
| for i in results.iter_mut() { |
| *i = rng.next_u32(); |
| } |
| let expected: [u32; 6] = [ |
| 0xa15c02b7, 0x7b47f409, 0xba1d3330, 0x83d2f293, 0xbfa4784b, 0xcbed606e, |
| ]; |
| assert_eq!(results, expected); |
| } |
| |
| #[cfg(feature = "serde1")] |
| #[test] |
| fn test_lcg64xsh32_serde() { |
| use bincode; |
| use std::io::{BufReader, BufWriter}; |
| |
| let mut rng = Lcg64Xsh32::seed_from_u64(0); |
| |
| let buf: Vec<u8> = Vec::new(); |
| let mut buf = BufWriter::new(buf); |
| bincode::serialize_into(&mut buf, &rng).expect("Could not serialize"); |
| |
| let buf = buf.into_inner().unwrap(); |
| let mut read = BufReader::new(&buf[..]); |
| let mut deserialized: Lcg64Xsh32 = |
| bincode::deserialize_from(&mut read).expect("Could not deserialize"); |
| |
| for _ in 0..16 { |
| assert_eq!(rng.next_u64(), deserialized.next_u64()); |
| } |
| } |