4 files changed, 142 insertions, 0 deletions
diff --git a/third_party/rust/getrandom/tests/common/mod.rs b/third_party/rust/getrandom/tests/common/mod.rs
new file mode 100644
index 0000000000..006f230d7c
--- /dev/null
+++ b/third_party/rust/getrandom/tests/common/mod.rs
@@ -0,0 +1,66 @@
+use super::getrandom_impl;
+
+#[cfg(all(target_arch = "wasm32", target_os = "unknown"))]
+use wasm_bindgen_test::wasm_bindgen_test as test;
+
+#[cfg(feature = "test-in-browser")]
+wasm_bindgen_test::wasm_bindgen_test_configure!(run_in_browser);
+
+#[test]
+fn test_zero() {
+    // Test that APIs are happy with zero-length requests
+    getrandom_impl(&mut [0u8; 0]).unwrap();
+}
+
+#[test]
+fn test_diff() {
+    let mut v1 = [0u8; 1000];
+    getrandom_impl(&mut v1).unwrap();
+
+    let mut v2 = [0u8; 1000];
+    getrandom_impl(&mut v2).unwrap();
+
+    let mut n_diff_bits = 0;
+    for i in 0..v1.len() {
+        n_diff_bits += (v1[i] ^ v2[i]).count_ones();
+    }
+
+    // Check at least 1 bit per byte differs. p(failure) < 1e-1000 with random input.
+    assert!(n_diff_bits >= v1.len() as u32);
+}
+
+#[test]
+fn test_huge() {
+    let mut huge = [0u8; 100_000];
+    getrandom_impl(&mut huge).unwrap();
+}
+
+// On WASM, the thread API always fails/panics
+#[cfg(not(target_arch = "wasm32"))]
+#[test]
+fn test_multithreading() {
+    extern crate std;
+    use std::{sync::mpsc::channel, thread, vec};
+
+    let mut txs = vec![];
+    for _ in 0..20 {
+        let (tx, rx) = channel();
+        txs.push(tx);
+
+        thread::spawn(move || {
+            // wait until all the tasks are ready to go.
+            rx.recv().unwrap();
+            let mut v = [0u8; 1000];
+
+            for _ in 0..100 {
+                getrandom_impl(&mut v).unwrap();
+                thread::yield_now();
+            }
+        });
+    }
+
+    // start all the tasks
+    for tx in txs.iter() {
+        tx.send(()).unwrap();
+    }
+}
diff --git a/third_party/rust/getrandom/tests/custom.rs b/third_party/rust/getrandom/tests/custom.rs
new file mode 100644
index 0000000000..62eae1d661
--- /dev/null
+++ b/third_party/rust/getrandom/tests/custom.rs
@@ -0,0 +1,50 @@
+// Test that a custom handler works on wasm32-unknown-unknown
+#![cfg(all(
+    target_arch = "wasm32",
+    target_os = "unknown",
+    feature = "custom",
+    not(feature = "js")
+))]
+
+use wasm_bindgen_test::wasm_bindgen_test as test;
+#[cfg(feature = "test-in-browser")]
+wasm_bindgen_test::wasm_bindgen_test_configure!(run_in_browser);
+
+use core::{
+    num::NonZeroU32,
+    sync::atomic::{AtomicU8, Ordering},
+};
+use getrandom::{getrandom, register_custom_getrandom, Error};
+
+fn len7_err() -> Error {
+    NonZeroU32::new(Error::INTERNAL_START + 7).unwrap().into()
+}
+
+fn super_insecure_rng(buf: &mut [u8]) -> Result<(), Error> {
+    // Length 7 buffers return a custom error
+    if buf.len() == 7 {
+        return Err(len7_err());
+    }
+    // Otherwise, increment an atomic counter
+    static COUNTER: AtomicU8 = AtomicU8::new(0);
+    for b in buf {
+        *b = COUNTER.fetch_add(1, Ordering::Relaxed);
+    }
+    Ok(())
+}
+
+register_custom_getrandom!(super_insecure_rng);
+
+#[test]
+fn custom_rng_output() {
+    let mut buf = [0u8; 4];
+    assert_eq!(getrandom(&mut buf), Ok(()));
+    assert_eq!(buf, [0, 1, 2, 3]);
+    assert_eq!(getrandom(&mut buf), Ok(()));
+    assert_eq!(buf, [4, 5, 6, 7]);
+}
+
+#[test]
+fn rng_err_output() {
+    assert_eq!(getrandom(&mut [0; 7]), Err(len7_err()));
+}
diff --git a/third_party/rust/getrandom/tests/normal.rs b/third_party/rust/getrandom/tests/normal.rs
new file mode 100644
index 0000000000..5fff13b38e
--- /dev/null
+++ b/third_party/rust/getrandom/tests/normal.rs
@@ -0,0 +1,11 @@
+// Don't test on custom wasm32-unknown-unknown
+#![cfg(not(all(
+    target_arch = "wasm32",
+    target_os = "unknown",
+    feature = "custom",
+    not(feature = "js")
+)))]
+
+// Use the normal getrandom implementation on this architecture.
+use getrandom::getrandom as getrandom_impl;
+mod common;
diff --git a/third_party/rust/getrandom/tests/rdrand.rs b/third_party/rust/getrandom/tests/rdrand.rs
new file mode 100644
index 0000000000..4ff85c47f8
--- /dev/null
+++ b/third_party/rust/getrandom/tests/rdrand.rs
@@ -0,0 +1,15 @@
+// We only test the RDRAND-based RNG source on supported architectures.
+#![cfg(any(target_arch = "x86_64", target_arch = "x86"))]
+
+// rdrand.rs expects to be part of the getrandom main crate, so we need these
+// additional imports to get rdrand.rs to compile.
+use getrandom::Error;
+#[macro_use]
+extern crate cfg_if;
+#[path = "../src/rdrand.rs"]
+mod rdrand;
+#[path = "../src/util.rs"]
+mod util;
+
+use rdrand::getrandom_inner as getrandom_impl;
+mod common;