1 files changed, 42 insertions, 0 deletions
diff --git a/third_party/rust/bitflags/src/tests/from_name.rs b/third_party/rust/bitflags/src/tests/from_name.rs
new file mode 100644
index 0000000000..1d9a4e48b6
--- /dev/null
+++ b/third_party/rust/bitflags/src/tests/from_name.rs
@@ -0,0 +1,42 @@
+use super::*;
+
+use crate::Flags;
+
+#[test]
+fn cases() {
+    case(Some(1), "A", TestFlags::from_name);
+    case(Some(1 << 1), "B", TestFlags::from_name);
+    case(Some(1 | 1 << 1 | 1 << 2), "ABC", TestFlags::from_name);
+
+    case(None, "", TestFlags::from_name);
+    case(None, "a", TestFlags::from_name);
+    case(None, "0x1", TestFlags::from_name);
+    case(None, "A | B", TestFlags::from_name);
+
+    case(Some(0), "ZERO", TestZero::from_name);
+
+    case(Some(2), "二", TestUnicode::from_name);
+
+    case(None, "_", TestExternal::from_name);
+
+    case(None, "", TestExternal::from_name);
+}
+
+#[track_caller]
+fn case<T: Flags>(expected: Option<T::Bits>, input: &str, inherent: impl FnOnce(&str) -> Option<T>)
+where
+    <T as Flags>::Bits: std::fmt::Debug + PartialEq,
+{
+    assert_eq!(
+        expected,
+        inherent(input).map(|f| f.bits()),
+        "T::from_name({:?})",
+        input
+    );
+    assert_eq!(
+        expected,
+        T::from_name(input).map(|f| f.bits()),
+        "Flags::from_name({:?})",
+        input
+    );
+}