1 files changed, 55 insertions, 0 deletions
diff --git a/rand/rand_pcg/tests/lcg128xsl64.rs b/rand/rand_pcg/tests/lcg128xsl64.rs
new file mode 100644
index 0000000..efc72ff
--- /dev/null
+++ b/rand/rand_pcg/tests/lcg128xsl64.rs
@@ -0,0 +1,55 @@
+use rand_core::{RngCore, SeedableRng};
+use rand_pcg::{Lcg128Xsl64, Pcg64};
+
+#[test]
+fn test_lcg128xsl64_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,
+            17,18,19,20, 21,22,23,24, 25,26,27,28, 29,30,31,32];
+    let mut rng1 = Lcg128Xsl64::from_seed(seed);
+    assert_eq!(rng1.next_u64(), 8740028313290271629);
+
+    let mut rng2 = Lcg128Xsl64::from_rng(&mut rng1).unwrap();
+    assert_eq!(rng2.next_u64(), 1922280315005786345);
+
+    let mut rng3 = Lcg128Xsl64::seed_from_u64(0);
+    assert_eq!(rng3.next_u64(), 2354861276966075475);
+
+    // This is the same as Lcg128Xsl64, so we only have a single test:
+    let mut rng4 = Pcg64::seed_from_u64(0);
+    assert_eq!(rng4.next_u64(), 2354861276966075475);
+}
+
+#[test]
+fn test_lcg128xsl64_true_values() {
+    // Numbers copied from official test suite (C version).
+    let mut rng = Lcg128Xsl64::new(42, 54);
+
+    let mut results = [0u64; 6];
+    for i in results.iter_mut() { *i = rng.next_u64(); }
+    let expected: [u64; 6] = [0x86b1da1d72062b68, 0x1304aa46c9853d39,
+        0xa3670e9e0dd50358, 0xf9090e529a7dae00, 0xc85b9fd837996f2c, 0x606121f8e3919196];
+    assert_eq!(results, expected);
+}
+
+#[cfg(feature="serde1")]
+#[test]
+fn test_lcg128xsl64_serde() {
+    use bincode;
+    use std::io::{BufWriter, BufReader};
+
+    let mut rng = Lcg128Xsl64::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: Lcg128Xsl64 = bincode::deserialize_from(&mut read)
+        .expect("Could not deserialize");
+
+    for _ in 0..16 {
+        assert_eq!(rng.next_u64(), deserialized.next_u64());
+    }
+}