1 files changed, 236 insertions, 0 deletions
diff --git a/third_party/rust/serde_cbor/tests/enum.rs b/third_party/rust/serde_cbor/tests/enum.rs
new file mode 100644
index 0000000000..630500d6b5
--- /dev/null
+++ b/third_party/rust/serde_cbor/tests/enum.rs
@@ -0,0 +1,236 @@
+use serde::Serialize;
+use serde_cbor;
+use serde_cbor::ser::{Serializer, SliceWrite};
+
+#[macro_use]
+extern crate serde_derive;
+
+#[test]
+fn test_simple_data_enum_roundtrip() {
+    #[derive(Debug, Serialize, Deserialize, PartialEq)]
+    enum DataEnum {
+        A(u32),
+        B(f32),
+    }
+
+    let a = DataEnum::A(42);
+
+    let mut slice = [0u8; 64];
+    let writer = SliceWrite::new(&mut slice);
+    let mut serializer = Serializer::new(writer);
+    a.serialize(&mut serializer).unwrap();
+    let writer = serializer.into_inner();
+    let end = writer.bytes_written();
+    let slice = writer.into_inner();
+    let deserialized: DataEnum =
+        serde_cbor::de::from_slice_with_scratch(&slice[..end], &mut []).unwrap();
+    assert_eq!(a, deserialized);
+}
+
+#[cfg(feature = "std")]
+mod std_tests {
+    use std::collections::BTreeMap;
+
+    use serde_cbor::ser::{IoWrite, Serializer};
+    use serde_cbor::value::Value;
+    use serde_cbor::{from_slice, to_vec};
+
+    pub fn to_vec_legacy<T>(value: &T) -> serde_cbor::Result<Vec<u8>>
+    where
+        T: serde::ser::Serialize,
+    {
+        let mut vec = Vec::new();
+        value.serialize(&mut Serializer::new(&mut IoWrite::new(&mut vec)).legacy_enums())?;
+        Ok(vec)
+    }
+
+    #[derive(Debug, Serialize, Deserialize, PartialEq, Eq)]
+    enum Enum {
+        A,
+        B,
+    }
+
+    #[derive(Debug, Serialize, Deserialize, PartialEq, Eq)]
+    struct EnumStruct {
+        e: Enum,
+    }
+
+    #[test]
+    fn test_enum() {
+        let enum_struct = EnumStruct { e: Enum::B };
+        let raw = &to_vec(&enum_struct).unwrap();
+        println!("raw enum {:?}", raw);
+        let re: EnumStruct = from_slice(raw).unwrap();
+        assert_eq!(enum_struct, re);
+    }
+
+    #[repr(u16)]
+    #[derive(Debug, Serialize, Deserialize, PartialEq, Eq)]
+    enum ReprEnum {
+        A,
+        B,
+    }
+
+    #[derive(Debug, Serialize, Deserialize, PartialEq, Eq)]
+    struct ReprEnumStruct {
+        e: ReprEnum,
+    }
+
+    #[test]
+    fn test_repr_enum() {
+        let repr_enum_struct = ReprEnumStruct { e: ReprEnum::B };
+        let re: ReprEnumStruct = from_slice(&to_vec(&repr_enum_struct).unwrap()).unwrap();
+        assert_eq!(repr_enum_struct, re);
+    }
+
+    #[derive(Debug, Serialize, Deserialize, PartialEq, Eq)]
+    enum DataEnum {
+        A(u32),
+        B(bool, u8),
+        C { x: u8, y: String },
+    }
+
+    #[test]
+    fn test_data_enum() {
+        let data_enum_a = DataEnum::A(4);
+        let re_a: DataEnum = from_slice(&to_vec(&data_enum_a).unwrap()).unwrap();
+        assert_eq!(data_enum_a, re_a);
+        let data_enum_b = DataEnum::B(true, 42);
+        let re_b: DataEnum = from_slice(&to_vec(&data_enum_b).unwrap()).unwrap();
+        assert_eq!(data_enum_b, re_b);
+        let data_enum_c = DataEnum::C {
+            x: 3,
+            y: "foo".to_owned(),
+        };
+        println!("{:?}", &to_vec(&data_enum_c).unwrap());
+        let re_c: DataEnum = from_slice(&to_vec(&data_enum_c).unwrap()).unwrap();
+        assert_eq!(data_enum_c, re_c);
+    }
+
+    #[test]
+    fn test_serialize() {
+        assert_eq!(to_vec_legacy(&Enum::A).unwrap(), &[97, 65]);
+        assert_eq!(to_vec_legacy(&Enum::B).unwrap(), &[97, 66]);
+        assert_eq!(
+            to_vec_legacy(&DataEnum::A(42)).unwrap(),
+            &[130, 97, 65, 24, 42]
+        );
+        assert_eq!(
+            to_vec_legacy(&DataEnum::B(true, 9)).unwrap(),
+            &[131, 97, 66, 245, 9]
+        );
+    }
+
+    #[test]
+    fn test_newtype_struct() {
+        #[derive(Debug, Deserialize, Serialize, PartialEq, Eq)]
+        pub struct Newtype(u8);
+        assert_eq!(to_vec(&142u8).unwrap(), to_vec(&Newtype(142u8)).unwrap());
+        assert_eq!(from_slice::<Newtype>(&[24, 142]).unwrap(), Newtype(142));
+    }
+
+    #[derive(Deserialize, PartialEq, Debug)]
+    enum Foo {
+        #[serde(rename = "require")]
+        Require,
+    }
+
+    #[test]
+    fn test_variable_length_array() {
+        let slice = b"\x9F\x67\x72\x65\x71\x75\x69\x72\x65\xFF";
+        let value: Vec<Foo> = from_slice(slice).unwrap();
+        assert_eq!(value, [Foo::Require]);
+    }
+
+    #[derive(Serialize, Deserialize, PartialEq, Debug)]
+    enum Bar {
+        Empty,
+        Number(i32),
+        Flag(String, bool),
+        Point { x: i32, y: i32 },
+    }
+
+    #[test]
+    fn test_enum_as_map() {
+        // unit variants serialize like bare strings
+        let empty_s = to_vec_legacy(&Bar::Empty).unwrap();
+        let empty_str_s = to_vec_legacy(&"Empty").unwrap();
+        assert_eq!(empty_s, empty_str_s);
+
+        // tuple-variants serialize like ["<variant>", values..]
+        let number_s = to_vec_legacy(&Bar::Number(42)).unwrap();
+        let number_vec = vec![Value::Text("Number".to_string()), Value::Integer(42)];
+        let number_vec_s = to_vec_legacy(&number_vec).unwrap();
+        assert_eq!(number_s, number_vec_s);
+
+        let flag_s = to_vec_legacy(&Bar::Flag("foo".to_string(), true)).unwrap();
+        let flag_vec = vec![
+            Value::Text("Flag".to_string()),
+            Value::Text("foo".to_string()),
+            Value::Bool(true),
+        ];
+        let flag_vec_s = to_vec_legacy(&flag_vec).unwrap();
+        assert_eq!(flag_s, flag_vec_s);
+
+        // struct-variants serialize like ["<variant>", {struct..}]
+        let point_s = to_vec_legacy(&Bar::Point { x: 5, y: -5 }).unwrap();
+        let mut struct_map = BTreeMap::new();
+        struct_map.insert(Value::Text("x".to_string()), Value::Integer(5));
+        struct_map.insert(Value::Text("y".to_string()), Value::Integer(-5));
+        let point_vec = vec![
+            Value::Text("Point".to_string()),
+            Value::Map(struct_map.clone()),
+        ];
+        let point_vec_s = to_vec_legacy(&point_vec).unwrap();
+        assert_eq!(point_s, point_vec_s);
+
+        // enum_as_map matches serde_json's default serialization for enums.
+
+        // unit variants still serialize like bare strings
+        let empty_s = to_vec(&Bar::Empty).unwrap();
+        assert_eq!(empty_s, empty_str_s);
+
+        // 1-element tuple variants serialize like {"<variant>": value}
+        let number_s = to_vec(&Bar::Number(42)).unwrap();
+        let mut number_map = BTreeMap::new();
+        number_map.insert("Number", 42);
+        let number_map_s = to_vec(&number_map).unwrap();
+        assert_eq!(number_s, number_map_s);
+
+        // multi-element tuple variants serialize like {"<variant>": [values..]}
+        let flag_s = to_vec(&Bar::Flag("foo".to_string(), true)).unwrap();
+        let mut flag_map = BTreeMap::new();
+        flag_map.insert(
+            "Flag",
+            vec![Value::Text("foo".to_string()), Value::Bool(true)],
+        );
+        let flag_map_s = to_vec(&flag_map).unwrap();
+        assert_eq!(flag_s, flag_map_s);
+
+        // struct-variants serialize like {"<variant>", {struct..}}
+        let point_s = to_vec(&Bar::Point { x: 5, y: -5 }).unwrap();
+        let mut point_map = BTreeMap::new();
+        point_map.insert("Point", Value::Map(struct_map));
+        let point_map_s = to_vec(&point_map).unwrap();
+        assert_eq!(point_s, point_map_s);
+
+        // deserialization of all encodings should just work
+        let empty_str_ds = from_slice(&empty_str_s).unwrap();
+        assert_eq!(Bar::Empty, empty_str_ds);
+
+        let number_vec_ds = from_slice(&number_vec_s).unwrap();
+        assert_eq!(Bar::Number(42), number_vec_ds);
+        let number_map_ds = from_slice(&number_map_s).unwrap();
+        assert_eq!(Bar::Number(42), number_map_ds);
+
+        let flag_vec_ds = from_slice(&flag_vec_s).unwrap();
+        assert_eq!(Bar::Flag("foo".to_string(), true), flag_vec_ds);
+        let flag_map_ds = from_slice(&flag_map_s).unwrap();
+        assert_eq!(Bar::Flag("foo".to_string(), true), flag_map_ds);
+
+        let point_vec_ds = from_slice(&point_vec_s).unwrap();
+        assert_eq!(Bar::Point { x: 5, y: -5 }, point_vec_ds);
+        let point_map_ds = from_slice(&point_map_s).unwrap();
+        assert_eq!(Bar::Point { x: 5, y: -5 }, point_map_ds);
+    }
+}