1 extern crate rand_pcg;
2 extern crate rand_core;
3 #[cfg(all(feature="serde1", test))] extern crate bincode;
4
5 use rand_core::{RngCore, SeedableRng};
6 use rand_pcg::{Lcg64Xsh32, Pcg32};
7
8 #[test]
test_lcg64xsh32_construction()9 fn test_lcg64xsh32_construction() {
10 // Test that various construction techniques produce a working RNG.
11 let seed = [1,2,3,4, 5,6,7,8, 9,10,11,12, 13,14,15,16];
12 let mut rng1 = Lcg64Xsh32::from_seed(seed);
13 assert_eq!(rng1.next_u64(), 1204678643940597513);
14
15 let mut rng2 = Lcg64Xsh32::from_rng(&mut rng1).unwrap();
16 assert_eq!(rng2.next_u64(), 12384929573776311845);
17
18 let mut rng3 = Lcg64Xsh32::seed_from_u64(0);
19 assert_eq!(rng3.next_u64(), 18195738587432868099);
20
21 // This is the same as Lcg64Xsh32, so we only have a single test:
22 let mut rng4 = Pcg32::seed_from_u64(0);
23 assert_eq!(rng4.next_u64(), 18195738587432868099);
24 }
25
26 #[test]
test_lcg64xsh32_true_values()27 fn test_lcg64xsh32_true_values() {
28 // Numbers copied from official test suite.
29 let mut rng = Lcg64Xsh32::new(42, 54);
30
31 let mut results = [0u32; 6];
32 for i in results.iter_mut() { *i = rng.next_u32(); }
33 let expected: [u32; 6] = [0xa15c02b7, 0x7b47f409, 0xba1d3330,
34 0x83d2f293, 0xbfa4784b, 0xcbed606e];
35 assert_eq!(results, expected);
36 }
37
38 #[cfg(feature="serde1")]
39 #[test]
test_lcg64xsh32_serde()40 fn test_lcg64xsh32_serde() {
41 use bincode;
42 use std::io::{BufWriter, BufReader};
43
44 let mut rng = Lcg64Xsh32::seed_from_u64(0);
45
46 let buf: Vec<u8> = Vec::new();
47 let mut buf = BufWriter::new(buf);
48 bincode::serialize_into(&mut buf, &rng).expect("Could not serialize");
49
50 let buf = buf.into_inner().unwrap();
51 let mut read = BufReader::new(&buf[..]);
52 let mut deserialized: Lcg64Xsh32 = bincode::deserialize_from(&mut read)
53 .expect("Could not deserialize");
54
55 for _ in 0..16 {
56 assert_eq!(rng.next_u64(), deserialized.next_u64());
57 }
58 }
59