1 files changed, 53 insertions, 0 deletions
diff --git a/third_party/rust/ron/tests/options.rs b/third_party/rust/ron/tests/options.rs
new file mode 100644
index 0000000000..89a122af8a
--- /dev/null
+++ b/third_party/rust/ron/tests/options.rs
@@ -0,0 +1,53 @@
+use serde::{Deserialize, Serialize};
+
+use ron::{extensions::Extensions, ser::PrettyConfig, Options};
+
+#[derive(Serialize, Deserialize)]
+struct Newtype(f64);
+
+#[derive(Serialize, Deserialize)]
+struct Struct(Option<u32>, Newtype);
+
+#[test]
+fn default_options() {
+    let ron = Options::default();
+
+    let de: Struct = ron.from_str("(Some(42),(4.2))").unwrap();
+    let ser = ron.to_string(&de).unwrap();
+
+    assert_eq!(ser, "(Some(42),(4.2))")
+}
+
+#[test]
+fn single_default_extension() {
+    let ron = Options::default().with_default_extension(Extensions::IMPLICIT_SOME);
+
+    let de: Struct = ron.from_str("(42,(4.2))").unwrap();
+    let ser = ron.to_string(&de).unwrap();
+
+    assert_eq!(ser, "(42,(4.2))");
+
+    let de: Struct = ron.from_str("#![enable(implicit_some)](42,(4.2))").unwrap();
+    let ser = ron.to_string(&de).unwrap();
+
+    assert_eq!(ser, "(42,(4.2))");
+
+    let de: Struct = ron
+        .from_str("#![enable(implicit_some)]#![enable(unwrap_newtypes)](42,4.2)")
+        .unwrap();
+    let ser = ron.to_string(&de).unwrap();
+
+    assert_eq!(ser, "(42,(4.2))");
+
+    let de: Struct = ron
+        .from_str("#![enable(implicit_some)]#![enable(unwrap_newtypes)](42,4.2)")
+        .unwrap();
+    let ser = ron
+        .to_string_pretty(
+            &de,
+            PrettyConfig::default().extensions(Extensions::UNWRAP_NEWTYPES),
+        )
+        .unwrap();
+
+    assert_eq!(ser, "#![enable(unwrap_newtypes)]\n(42, 4.2)");
+}