1 use rand_core::{RngCore, SeedableRng};
2 use rand_pcg::{Lcg128Xsl64, Pcg64};
3
4 #[test]
test_lcg128xsl64_construction()5 fn test_lcg128xsl64_construction() {
6 // Test that various construction techniques produce a working RNG.
7 let seed = [1,2,3,4, 5,6,7,8, 9,10,11,12, 13,14,15,16,
8 17,18,19,20, 21,22,23,24, 25,26,27,28, 29,30,31,32];
9 let mut rng1 = Lcg128Xsl64::from_seed(seed);
10 assert_eq!(rng1.next_u64(), 8740028313290271629);
11
12 let mut rng2 = Lcg128Xsl64::from_rng(&mut rng1).unwrap();
13 assert_eq!(rng2.next_u64(), 1922280315005786345);
14
15 let mut rng3 = Lcg128Xsl64::seed_from_u64(0);
16 assert_eq!(rng3.next_u64(), 2354861276966075475);
17
18 // This is the same as Lcg128Xsl64, so we only have a single test:
19 let mut rng4 = Pcg64::seed_from_u64(0);
20 assert_eq!(rng4.next_u64(), 2354861276966075475);
21 }
22
23 #[test]
test_lcg128xsl64_true_values()24 fn test_lcg128xsl64_true_values() {
25 // Numbers copied from official test suite (C version).
26 let mut rng = Lcg128Xsl64::new(42, 54);
27
28 let mut results = [0u64; 6];
29 for i in results.iter_mut() { *i = rng.next_u64(); }
30 let expected: [u64; 6] = [0x86b1da1d72062b68, 0x1304aa46c9853d39,
31 0xa3670e9e0dd50358, 0xf9090e529a7dae00, 0xc85b9fd837996f2c, 0x606121f8e3919196];
32 assert_eq!(results, expected);
33 }
34
35 #[cfg(feature="serde1")]
36 #[test]
test_lcg128xsl64_serde()37 fn test_lcg128xsl64_serde() {
38 use bincode;
39 use std::io::{BufWriter, BufReader};
40
41 let mut rng = Lcg128Xsl64::seed_from_u64(0);
42
43 let buf: Vec<u8> = Vec::new();
44 let mut buf = BufWriter::new(buf);
45 bincode::serialize_into(&mut buf, &rng).expect("Could not serialize");
46
47 let buf = buf.into_inner().unwrap();
48 let mut read = BufReader::new(&buf[..]);
49 let mut deserialized: Lcg128Xsl64 = bincode::deserialize_from(&mut read)
50 .expect("Could not deserialize");
51
52 for _ in 0..16 {
53 assert_eq!(rng.next_u64(), deserialized.next_u64());
54 }
55 }
56