1 files changed, 66 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();
+    }
+}