1 files changed, 23 insertions, 0 deletions
diff --git a/third_party/rust/bitflags/src/tests/empty.rs b/third_party/rust/bitflags/src/tests/empty.rs
new file mode 100644
index 0000000000..57fb1c7cf1
--- /dev/null
+++ b/third_party/rust/bitflags/src/tests/empty.rs
@@ -0,0 +1,23 @@
+use super::*;
+
+use crate::Flags;
+
+#[test]
+fn cases() {
+    case(0, TestFlags::empty);
+
+    case(0, TestZero::empty);
+
+    case(0, TestEmpty::empty);
+
+    case(0, TestExternal::empty);
+}
+
+#[track_caller]
+fn case<T: Flags>(expected: T::Bits, inherent: impl FnOnce() -> T)
+where
+    <T as Flags>::Bits: std::fmt::Debug + PartialEq,
+{
+    assert_eq!(expected, inherent().bits(), "T::empty()");
+    assert_eq!(expected, T::empty().bits(), "Flags::empty()");
+}