1 #![cfg(rustc_1_26)]
2 extern crate rand_pcg;
3 extern crate rand_core;
4 #[cfg(all(feature="serde1", test))] extern crate bincode;
5
6 use rand_core::{RngCore, SeedableRng};
7 use rand_pcg::{Mcg128Xsl64, Pcg64Mcg};
8
9 #[test]
test_mcg128xsl64_construction()10 fn test_mcg128xsl64_construction() {
11 // Test that various construction techniques produce a working RNG.
12 let seed = [1,2,3,4, 5,6,7,8, 9,10,11,12, 13,14,15,16];
13 let mut rng1 = Mcg128Xsl64::from_seed(seed);
14 assert_eq!(rng1.next_u64(), 7071994460355047496);
15
16 let mut rng2 = Mcg128Xsl64::from_rng(&mut rng1).unwrap();
17 assert_eq!(rng2.next_u64(), 12300796107712034932);
18
19 let mut rng3 = Mcg128Xsl64::seed_from_u64(0);
20 assert_eq!(rng3.next_u64(), 6198063878555692194);
21
22 // This is the same as Mcg128Xsl64, so we only have a single test:
23 let mut rng4 = Pcg64Mcg::seed_from_u64(0);
24 assert_eq!(rng4.next_u64(), 6198063878555692194);
25 }
26
27 #[test]
test_mcg128xsl64_true_values()28 fn test_mcg128xsl64_true_values() {
29 // Numbers copied from official test suite (C version).
30 let mut rng = Mcg128Xsl64::new(42);
31
32 let mut results = [0u64; 6];
33 for i in results.iter_mut() { *i = rng.next_u64(); }
34 let expected: [u64; 6] = [0x63b4a3a813ce700a, 0x382954200617ab24,
35 0xa7fd85ae3fe950ce, 0xd715286aa2887737, 0x60c92fee2e59f32c, 0x84c4e96beff30017];
36 assert_eq!(results, expected);
37 }
38
39 #[cfg(feature="serde1")]
40 #[test]
test_mcg128xsl64_serde()41 fn test_mcg128xsl64_serde() {
42 use bincode;
43 use std::io::{BufWriter, BufReader};
44
45 let mut rng = Mcg128Xsl64::seed_from_u64(0);
46
47 let buf: Vec<u8> = Vec::new();
48 let mut buf = BufWriter::new(buf);
49 bincode::serialize_into(&mut buf, &rng).expect("Could not serialize");
50
51 let buf = buf.into_inner().unwrap();
52 let mut read = BufReader::new(&buf[..]);
53 let mut deserialized: Mcg128Xsl64 = bincode::deserialize_from(&mut read)
54 .expect("Could not deserialize");
55
56 for _ in 0..16 {
57 assert_eq!(rng.next_u64(), deserialized.next_u64());
58 }
59 }
60