1 files changed, 143 insertions, 0 deletions
diff --git a/third_party/rust/fastrand/tests/smoke.rs b/third_party/rust/fastrand/tests/smoke.rs
new file mode 100644
index 0000000000..7c92ee52ef
--- /dev/null
+++ b/third_party/rust/fastrand/tests/smoke.rs
@@ -0,0 +1,143 @@
+#[cfg(all(target_family = "wasm", not(target_os = "wasi")))]
+use wasm_bindgen_test::wasm_bindgen_test as test;
+
+#[cfg(all(target_family = "wasm", not(target_os = "wasi")))]
+wasm_bindgen_test::wasm_bindgen_test_configure!(run_in_browser);
+
+#[test]
+fn bool() {
+    for x in &[false, true] {
+        while fastrand::bool() != *x {}
+    }
+}
+
+#[test]
+fn u8() {
+    for x in 0..10 {
+        while fastrand::u8(..10) != x {}
+    }
+
+    for x in 200..=u8::MAX {
+        while fastrand::u8(200..) != x {}
+    }
+}
+
+#[test]
+fn i8() {
+    for x in -128..-120 {
+        while fastrand::i8(..-120) != x {}
+    }
+
+    for x in 120..=127 {
+        while fastrand::i8(120..) != x {}
+    }
+}
+
+#[test]
+fn u32() {
+    for n in 1u32..10_000 {
+        let n = n.wrapping_mul(n);
+        let n = n.wrapping_mul(n);
+        if n != 0 {
+            for _ in 0..1000 {
+                assert!(fastrand::u32(..n) < n);
+            }
+        }
+    }
+}
+
+#[test]
+fn u64() {
+    for n in 1u64..10_000 {
+        let n = n.wrapping_mul(n);
+        let n = n.wrapping_mul(n);
+        let n = n.wrapping_mul(n);
+        if n != 0 {
+            for _ in 0..1000 {
+                assert!(fastrand::u64(..n) < n);
+            }
+        }
+    }
+}
+
+#[test]
+fn u128() {
+    for n in 1u128..10_000 {
+        let n = n.wrapping_mul(n);
+        let n = n.wrapping_mul(n);
+        let n = n.wrapping_mul(n);
+        let n = n.wrapping_mul(n);
+        if n != 0 {
+            for _ in 0..1000 {
+                assert!(fastrand::u128(..n) < n);
+            }
+        }
+    }
+}
+
+#[test]
+fn fill() {
+    let mut r = fastrand::Rng::new();
+    let mut a = [0u8; 64];
+    let mut b = [0u8; 64];
+
+    r.fill(&mut a);
+    r.fill(&mut b);
+
+    assert_ne!(a, b);
+}
+
+#[test]
+fn rng() {
+    let mut r = fastrand::Rng::new();
+
+    assert_ne!(r.u64(..), r.u64(..));
+
+    r.seed(7);
+    let a = r.u64(..);
+    r.seed(7);
+    let b = r.u64(..);
+    assert_eq!(a, b);
+}
+
+#[test]
+fn rng_init() {
+    let mut a = fastrand::Rng::new();
+    let mut b = fastrand::Rng::new();
+    assert_ne!(a.u64(..), b.u64(..));
+
+    a.seed(7);
+    b.seed(7);
+    assert_eq!(a.u64(..), b.u64(..));
+}
+
+#[test]
+fn with_seed() {
+    let mut a = fastrand::Rng::with_seed(7);
+    let mut b = fastrand::Rng::new();
+    b.seed(7);
+    assert_eq!(a.u64(..), b.u64(..));
+}
+
+#[test]
+fn choose_multiple() {
+    let mut a = fastrand::Rng::new();
+    let mut elements = (0..20).collect::<Vec<_>>();
+
+    while !elements.is_empty() {
+        let chosen = a.choose_multiple(0..20, 5);
+        for &x in &chosen {
+            elements.retain(|&y| y != x);
+        }
+    }
+}
+
+#[test]
+fn choice() {
+    let items = [1, 4, 9, 5, 2, 3, 6, 7, 8, 0];
+    let mut r = fastrand::Rng::new();
+
+    for item in &items {
+        while r.choice(&items).unwrap() != item {}
+    }
+}