1 files changed, 43 insertions, 0 deletions
diff --git a/third_party/rust/num-bigint/tests/torture.rs b/third_party/rust/num-bigint/tests/torture.rs
new file mode 100644
index 0000000000..4f073d31d9
--- /dev/null
+++ b/third_party/rust/num-bigint/tests/torture.rs
@@ -0,0 +1,43 @@
+#![cfg(feature = "rand")]
+
+extern crate num_bigint;
+extern crate num_traits;
+extern crate rand;
+
+use num_bigint::RandBigInt;
+use num_traits::Zero;
+use rand::prelude::*;
+
+fn test_mul_divide_torture_count(count: usize) {
+    let bits_max = 1 << 12;
+    let seed = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16];
+    let mut rng = SmallRng::from_seed(seed);
+
+    for _ in 0..count {
+        // Test with numbers of random sizes:
+        let xbits = rng.gen_range(0, bits_max);
+        let ybits = rng.gen_range(0, bits_max);
+
+        let x = rng.gen_biguint(xbits);
+        let y = rng.gen_biguint(ybits);
+
+        if x.is_zero() || y.is_zero() {
+            continue;
+        }
+
+        let prod = &x * &y;
+        assert_eq!(&prod / &x, y);
+        assert_eq!(&prod / &y, x);
+    }
+}
+
+#[test]
+fn test_mul_divide_torture() {
+    test_mul_divide_torture_count(1000);
+}
+
+#[test]
+#[ignore]
+fn test_mul_divide_torture_long() {
+    test_mul_divide_torture_count(1000000);
+}