chore: checkpoint before Python removal

vendor/getrandom/tests/sys_rng.rs

@@ -0,0 +1,18 @@
+//! Tests for `SysRng`
+#![cfg(feature = "sys_rng")]
+
+use getrandom::SysRng;
+use getrandom::rand_core::TryRng;
+
+#[test]
+fn test_sys_rng() {
+    let x = SysRng.try_next_u64().unwrap();
+    let y = SysRng.try_next_u64().unwrap();
+    assert!(x != 0);
+    assert!(x != y);
+}
+
+#[test]
+fn test_construction() {
+    assert!(SysRng.try_next_u64().unwrap() != 0);
+}