1 use rand_core::{RngCore, SeedableRng};
2 use rand_pcg::{Lcg64Xsh32, Pcg32};
3
4 #[test]
test_lcg64xsh32_construction()5 fn test_lcg64xsh32_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 let mut rng1 = Lcg64Xsh32::from_seed(seed);
9 assert_eq!(rng1.next_u64(), 1204678643940597513);
10
11 let mut rng2 = Lcg64Xsh32::from_rng(&mut rng1).unwrap();
12 assert_eq!(rng2.next_u64(), 12384929573776311845);
13
14 let mut rng3 = Lcg64Xsh32::seed_from_u64(0);
15 assert_eq!(rng3.next_u64(), 18195738587432868099);
16
17 // This is the same as Lcg64Xsh32, so we only have a single test:
18 let mut rng4 = Pcg32::seed_from_u64(0);
19 assert_eq!(rng4.next_u64(), 18195738587432868099);
20 }
21
22 #[test]
test_lcg64xsh32_true_values()23 fn test_lcg64xsh32_true_values() {
24 // Numbers copied from official test suite.
25 let mut rng = Lcg64Xsh32::new(42, 54);
26
27 let mut results = [0u32; 6];
28 for i in results.iter_mut() { *i = rng.next_u32(); }
29 let expected: [u32; 6] = [0xa15c02b7, 0x7b47f409, 0xba1d3330,
30 0x83d2f293, 0xbfa4784b, 0xcbed606e];
31 assert_eq!(results, expected);
32 }
33
34 #[cfg(feature="serde1")]
35 #[test]
test_lcg64xsh32_serde()36 fn test_lcg64xsh32_serde() {
37 use bincode;
38 use std::io::{BufWriter, BufReader};
39
40 let mut rng = Lcg64Xsh32::seed_from_u64(0);
41
42 let buf: Vec<u8> = Vec::new();
43 let mut buf = BufWriter::new(buf);
44 bincode::serialize_into(&mut buf, &rng).expect("Could not serialize");
45
46 let buf = buf.into_inner().unwrap();
47 let mut read = BufReader::new(&buf[..]);
48 let mut deserialized: Lcg64Xsh32 = bincode::deserialize_from(&mut read)
49 .expect("Could not deserialize");
50
51 for _ in 0..16 {
52 assert_eq!(rng.next_u64(), deserialized.next_u64());
53 }
54 }
55