1 files changed, 6 insertions, 0 deletions
diff --git a/library/std/src/sys_common/tests.rs b/library/std/src/sys_common/tests.rs
new file mode 100644
index 000000000..1b6446db5
--- /dev/null
+++ b/library/std/src/sys_common/tests.rs
@@ -0,0 +1,6 @@
+use super::mul_div_u64;
+
+#[test]
+fn test_muldiv() {
+    assert_eq!(mul_div_u64(1_000_000_000_001, 1_000_000_000, 1_000_000), 1_000_000_000_001_000);
+}