rhai/tests/serde.rs

#![cfg(feature = "serde")]

use rhai::{
    serde::{from_dynamic, to_dynamic},
    Dynamic, Engine, EvalAltResult, ImmutableString, INT,
};
use serde::{Deserialize, Serialize};

#[cfg(not(feature = "no_index"))]
use rhai::Array;
#[cfg(not(feature = "no_object"))]
use rhai::Map;
#[cfg(not(feature = "no_float"))]
use rhai::FLOAT;
#[cfg(feature = "decimal")]
use rust_decimal::Decimal;

#[test]
fn test_serde_ser_primary_types() -> Result<(), Box<EvalAltResult>> {
    assert!(to_dynamic(42_u64)?.is::<INT>());
    assert!(to_dynamic(u64::MAX)?.is::<u64>());
    assert!(to_dynamic(42 as INT)?.is::<INT>());
    assert!(to_dynamic(true)?.is::<bool>());
    assert!(to_dynamic(())?.is::<()>());

    #[cfg(not(feature = "no_float"))]
    {
        assert!(to_dynamic(123.456_f64)?.is::<f64>());
        assert!(to_dynamic(123.456_f32)?.is::<f32>());
    }

    #[cfg(feature = "no_float")]
    #[cfg(feature = "decimal")]
    {
        assert!(to_dynamic(123.456_f64)?.is::<Decimal>());
        assert!(to_dynamic(123.456_f32)?.is::<Decimal>());
    }

    assert!(to_dynamic("hello".to_string())?.is::<String>());

    Ok(())
}

#[test]
fn test_serde_ser_integer_types() -> Result<(), Box<EvalAltResult>> {
    assert!(to_dynamic(42_i8)?.is::<INT>());
    assert!(to_dynamic(42_i16)?.is::<INT>());
    assert!(to_dynamic(42_i32)?.is::<INT>());
    assert!(to_dynamic(42_i64)?.is::<INT>());
    assert!(to_dynamic(42_u8)?.is::<INT>());
    assert!(to_dynamic(42_u16)?.is::<INT>());
    assert!(to_dynamic(42_u32)?.is::<INT>());
    assert!(to_dynamic(42_u64)?.is::<INT>());

    Ok(())
}

#[test]
#[cfg(not(feature = "no_index"))]
fn test_serde_ser_array() -> Result<(), Box<EvalAltResult>> {
    let arr: Vec<INT> = vec![123, 456, 42, 999];

    let d = to_dynamic(arr)?;
    assert!(d.is::<Array>());
    assert_eq!(4, d.cast::<Array>().len());

    Ok(())
}

#[test]
#[cfg(not(feature = "no_index"))]
#[cfg(not(feature = "no_object"))]
fn test_serde_ser_struct() -> Result<(), Box<EvalAltResult>> {
    #[derive(Debug, Serialize, PartialEq)]
    struct Hello {
        a: INT,
        b: bool,
    }

    #[derive(Debug, Serialize, PartialEq)]
    struct Test {
        int: u32,
        seq: Vec<String>,
        obj: Hello,
    }

    let x = Test {
        int: 42,
        seq: vec!["hello".into(), "kitty".into(), "world".into()],
        obj: Hello { a: 123, b: true },
    };

    let d = to_dynamic(x)?;

    assert!(d.is::<Map>());

    let mut map = d.cast::<Map>();
    let obj = map.remove("obj").unwrap().cast::<Map>();
    let mut seq = map.remove("seq").unwrap().cast::<Array>();

    assert_eq!(Ok(123), obj["a"].as_int());
    assert!(obj["b"].as_bool().unwrap());
    assert_eq!(Ok(42), map["int"].as_int());
    assert_eq!(seq.len(), 3);
    assert_eq!("kitty", seq.remove(1).into_string().unwrap());

    Ok(())
}

#[test]
fn test_serde_ser_unit_enum() -> Result<(), Box<EvalAltResult>> {
    #[derive(Serialize)]
    enum MyEnum {
        VariantFoo,
        VariantBar,
    }

    let d = to_dynamic(MyEnum::VariantFoo)?;
    assert_eq!("VariantFoo", d.into_string().unwrap());

    let d = to_dynamic(MyEnum::VariantBar)?;
    assert_eq!("VariantBar", d.into_string().unwrap());

    Ok(())
}

#[test]
#[cfg(not(feature = "no_object"))]
fn test_serde_ser_externally_tagged_enum() -> Result<(), Box<EvalAltResult>> {
    #[derive(Serialize)]
    enum MyEnum {
        VariantUnit,
        #[cfg(not(feature = "no_index"))]
        VariantUnitTuple(),
        VariantNewtype(i32),
        #[cfg(not(feature = "no_index"))]
        VariantTuple(i32, i32),
        VariantEmptyStruct {},
        VariantStruct {
            a: i32,
        },
    }

    {
        assert_eq!(
            "VariantUnit",
            to_dynamic(MyEnum::VariantUnit)?
                .into_immutable_string()
                .unwrap()
                .as_str()
        );
    }

    #[cfg(not(feature = "no_index"))]
    {
        let mut map = to_dynamic(MyEnum::VariantUnitTuple())?.cast::<Map>();
        let content = map.remove("VariantUnitTuple").unwrap().cast::<Array>();
        assert!(map.is_empty());
        assert!(content.is_empty());
    }

    let mut map = to_dynamic(MyEnum::VariantNewtype(123))?.cast::<Map>();
    let content = map.remove("VariantNewtype").unwrap();
    assert!(map.is_empty());
    assert_eq!(Ok(123), content.as_int());

    #[cfg(not(feature = "no_index"))]
    {
        let mut map = to_dynamic(MyEnum::VariantTuple(123, 456))?.cast::<Map>();
        let content = map.remove("VariantTuple").unwrap().cast::<Array>();
        assert!(map.is_empty());
        assert_eq!(2, content.len());
        assert_eq!(Ok(123), content[0].as_int());
        assert_eq!(Ok(456), content[1].as_int());
    }

    let mut map = to_dynamic(MyEnum::VariantEmptyStruct {})?.cast::<Map>();
    let map_inner = map.remove("VariantEmptyStruct").unwrap().cast::<Map>();
    assert!(map.is_empty());
    assert!(map_inner.is_empty());

    let mut map = to_dynamic(MyEnum::VariantStruct { a: 123 })?.cast::<Map>();
    let mut map_inner = map.remove("VariantStruct").unwrap().cast::<Map>();
    assert!(map.is_empty());
    assert_eq!(Ok(123), map_inner.remove("a").unwrap().as_int());
    assert!(map_inner.is_empty());

    Ok(())
}

#[test]
#[cfg(not(feature = "no_object"))]
fn test_serde_ser_internally_tagged_enum() -> Result<(), Box<EvalAltResult>> {
    #[derive(Serialize)]
    #[serde(tag = "tag")]
    enum MyEnum {
        VariantEmptyStruct {},
        VariantStruct { a: i32 },
    }

    let mut map = to_dynamic(MyEnum::VariantEmptyStruct {})?.cast::<Map>();
    assert_eq!(
        "VariantEmptyStruct",
        map.remove("tag")
            .unwrap()
            .into_immutable_string()
            .unwrap()
            .as_str()
    );
    assert!(map.is_empty());

    let mut map = to_dynamic(MyEnum::VariantStruct { a: 123 })?.cast::<Map>();
    assert_eq!(
        "VariantStruct",
        map.remove("tag")
            .unwrap()
            .into_immutable_string()
            .unwrap()
            .as_str()
    );
    assert_eq!(Ok(123), map.remove("a").unwrap().as_int());
    assert!(map.is_empty());

    Ok(())
}

#[test]
#[cfg(not(feature = "no_object"))]
fn test_serde_ser_adjacently_tagged_enum() -> Result<(), Box<EvalAltResult>> {
    #[derive(Serialize)]
    #[serde(tag = "tag", content = "content")]
    enum MyEnum {
        VariantUnit,
        #[cfg(not(feature = "no_index"))]
        VariantUnitTuple(),
        VariantNewtype(i32),
        #[cfg(not(feature = "no_index"))]
        VariantTuple(i32, i32),
        VariantEmptyStruct {},
        VariantStruct {
            a: i32,
        },
    }

    let mut map = to_dynamic(MyEnum::VariantUnit)?.cast::<Map>();
    assert_eq!(
        "VariantUnit",
        map.remove("tag")
            .unwrap()
            .into_immutable_string()
            .unwrap()
            .as_str()
    );
    assert!(map.is_empty());

    #[cfg(not(feature = "no_index"))]
    {
        let mut map = to_dynamic(MyEnum::VariantUnitTuple())?.cast::<Map>();
        assert_eq!(
            "VariantUnitTuple",
            map.remove("tag")
                .unwrap()
                .into_immutable_string()
                .unwrap()
                .as_str()
        );
        let content = map.remove("content").unwrap().cast::<Array>();
        assert!(map.is_empty());
        assert!(content.is_empty());
    }

    let mut map = to_dynamic(MyEnum::VariantNewtype(123))?.cast::<Map>();
    assert_eq!(
        "VariantNewtype",
        map.remove("tag")
            .unwrap()
            .into_immutable_string()
            .unwrap()
            .as_str()
    );
    let content = map.remove("content").unwrap();
    assert!(map.is_empty());
    assert_eq!(Ok(123), content.as_int());

    #[cfg(not(feature = "no_index"))]
    {
        let mut map = to_dynamic(MyEnum::VariantTuple(123, 456))?.cast::<Map>();
        assert_eq!(
            "VariantTuple",
            map.remove("tag")
                .unwrap()
                .into_immutable_string()
                .unwrap()
                .as_str()
        );
        let content = map.remove("content").unwrap().cast::<Array>();
        assert!(map.is_empty());
        assert_eq!(2, content.len());
        assert_eq!(Ok(123), content[0].as_int());
        assert_eq!(Ok(456), content[1].as_int());
    }

    let mut map = to_dynamic(MyEnum::VariantEmptyStruct {})?.cast::<Map>();
    assert_eq!(
        "VariantEmptyStruct",
        map.remove("tag")
            .unwrap()
            .into_immutable_string()
            .unwrap()
            .as_str()
    );
    let map_inner = map.remove("content").unwrap().cast::<Map>();
    assert!(map.is_empty());
    assert!(map_inner.is_empty());

    let mut map = to_dynamic(MyEnum::VariantStruct { a: 123 })?.cast::<Map>();
    assert_eq!(
        "VariantStruct",
        map.remove("tag").unwrap().into_string().unwrap()
    );
    let mut map_inner = map.remove("content").unwrap().cast::<Map>();
    assert!(map.is_empty());
    assert_eq!(Ok(123), map_inner.remove("a").unwrap().as_int());
    assert!(map_inner.is_empty());

    Ok(())
}

#[test]
#[cfg(not(feature = "no_object"))]
fn test_serde_ser_untagged_enum() -> Result<(), Box<EvalAltResult>> {
    #[derive(Serialize)]
    #[serde(untagged)]
    enum MyEnum {
        VariantEmptyStruct {},
        VariantStruct1 { a: i32 },
        VariantStruct2 { b: i32 },
    }

    let map = to_dynamic(MyEnum::VariantEmptyStruct {})?.cast::<Map>();
    assert!(map.is_empty());

    let mut map = to_dynamic(MyEnum::VariantStruct1 { a: 123 })?.cast::<Map>();
    assert_eq!(Ok(123), map.remove("a").unwrap().as_int());
    assert!(map.is_empty());

    let mut map = to_dynamic(MyEnum::VariantStruct2 { b: 123 })?.cast::<Map>();
    assert_eq!(Ok(123), map.remove("b").unwrap().as_int());
    assert!(map.is_empty());

    Ok(())
}

#[test]
fn test_serde_de_primary_types() -> Result<(), Box<EvalAltResult>> {
    assert_eq!(42, from_dynamic::<u16>(&Dynamic::from(42_u16))?);
    assert_eq!(42, from_dynamic::<INT>(&(42 as INT).into())?);
    assert_eq!(true, from_dynamic::<bool>(&true.into())?);
    assert_eq!((), from_dynamic::<()>(&().into())?);

    #[cfg(not(feature = "no_float"))]
    {
        assert_eq!(123.456, from_dynamic::<FLOAT>(&123.456.into())?);
        assert_eq!(123.456, from_dynamic::<f32>(&Dynamic::from(123.456_f32))?);
    }

    #[cfg(feature = "no_float")]
    #[cfg(feature = "decimal")]
    {
        let d: Dynamic = Decimal::from_str("123.456").unwrap().into();

        assert_eq!(123.456, from_dynamic::<f64>(&d)?);
        assert_eq!(123.456, from_dynamic::<f32>(&d)?);
    }

    assert_eq!(
        "hello",
        from_dynamic::<String>(&"hello".to_string().into())?
    );

    Ok(())
}

#[test]
fn test_serde_de_integer_types() -> Result<(), Box<EvalAltResult>> {
    assert_eq!(42, from_dynamic::<i8>(&Dynamic::from(42 as INT))?);
    assert_eq!(42, from_dynamic::<i16>(&Dynamic::from(42 as INT))?);
    assert_eq!(42, from_dynamic::<i32>(&Dynamic::from(42 as INT))?);
    assert_eq!(42, from_dynamic::<i64>(&Dynamic::from(42 as INT))?);
    assert_eq!(42, from_dynamic::<u8>(&Dynamic::from(42 as INT))?);
    assert_eq!(42, from_dynamic::<u16>(&Dynamic::from(42 as INT))?);
    assert_eq!(42, from_dynamic::<u32>(&Dynamic::from(42 as INT))?);
    assert_eq!(42, from_dynamic::<u64>(&Dynamic::from(42 as INT))?);

    Ok(())
}

#[test]
#[cfg(not(feature = "no_index"))]
fn test_serde_de_array() -> Result<(), Box<EvalAltResult>> {
    let arr: Vec<INT> = vec![123, 456, 42, 999];
    assert_eq!(arr, from_dynamic::<Vec<INT>>(&arr.clone().into())?);
    Ok(())
}

#[test]
#[cfg(not(feature = "no_index"))]
#[cfg(not(feature = "no_object"))]
fn test_serde_de_struct() -> Result<(), Box<EvalAltResult>> {
    #[derive(Debug, Deserialize, PartialEq)]
    struct Hello {
        a: INT,
        b: bool,
    }

    #[derive(Debug, Deserialize, PartialEq)]
    struct Test {
        int: u32,
        seq: Vec<String>,
        obj: Hello,
    }

    let mut map = Map::new();
    map.insert("int".into(), Dynamic::from(42_u32));

    let mut map2 = Map::new();
    map2.insert("a".into(), (123 as INT).into());
    map2.insert("b".into(), true.into());

    map.insert("obj".into(), map2.into());

    let arr: Array = vec!["hello".into(), "kitty".into(), "world".into()];
    map.insert("seq".into(), arr.into());

    let expected = Test {
        int: 42,
        seq: vec!["hello".into(), "kitty".into(), "world".into()],
        obj: Hello { a: 123, b: true },
    };
    assert_eq!(expected, from_dynamic(&map.into())?);

    Ok(())
}

#[test]
#[cfg(not(feature = "no_index"))]
#[cfg(not(feature = "no_object"))]
#[cfg(not(feature = "no_float"))]
fn test_serde_de_script() -> Result<(), Box<EvalAltResult>> {
    #[derive(Debug, Deserialize)]
    struct Point {
        x: FLOAT,
        y: FLOAT,
    }

    #[derive(Debug, Deserialize)]
    struct MyStruct {
        a: i64,
        b: Vec<String>,
        c: bool,
        d: Point,
    }

    let engine = Engine::new();

    let result: Dynamic = engine.eval(
        r#"
            #{
                a: 42,
                b: [ "hello", "world" ],
                c: true,
                d: #{ x: 123.456, y: 999.0 }
            }
        "#,
    )?;

    // Convert the 'Dynamic' object map into 'MyStruct'
    let _: MyStruct = from_dynamic(&result)?;

    Ok(())
}

#[test]
fn test_serde_de_unit_enum() -> Result<(), Box<EvalAltResult>> {
    #[derive(Debug, PartialEq, Deserialize)]
    enum MyEnum {
        VariantFoo,
        VariantBar,
    }

    let d = Dynamic::from("VariantFoo".to_string());
    assert_eq!(MyEnum::VariantFoo, from_dynamic(&d)?);

    let d = Dynamic::from("VariantBar".to_string());
    assert_eq!(MyEnum::VariantBar, from_dynamic(&d)?);

    Ok(())
}

#[test]
#[cfg(not(feature = "no_object"))]
fn test_serde_de_externally_tagged_enum() -> Result<(), Box<EvalAltResult>> {
    #[derive(Debug, PartialEq, Deserialize)]
    #[serde(deny_unknown_fields)]
    enum MyEnum {
        VariantUnit,
        #[cfg(not(feature = "no_index"))]
        VariantUnitTuple(),
        VariantNewtype(i32),
        #[cfg(not(feature = "no_index"))]
        VariantTuple(i32, i32),
        VariantEmptyStruct {},
        VariantStruct {
            a: i32,
        },
    }

    let d = Dynamic::from("VariantUnit".to_string());
    assert_eq!(MyEnum::VariantUnit, from_dynamic(&d).unwrap());

    #[cfg(not(feature = "no_index"))]
    {
        let array: Array = vec![];
        let mut map_outer = Map::new();
        map_outer.insert("VariantUnitTuple".into(), array.into());
        assert_eq!(
            MyEnum::VariantUnitTuple(),
            from_dynamic(&map_outer.into()).unwrap()
        );
    }

    let mut map_outer = Map::new();
    map_outer.insert("VariantNewtype".into(), (123 as INT).into());
    assert_eq!(
        MyEnum::VariantNewtype(123),
        from_dynamic(&map_outer.into()).unwrap()
    );

    #[cfg(not(feature = "no_index"))]
    {
        let array: Array = vec![(123 as INT).into(), (456 as INT).into()];
        let mut map_outer = Map::new();
        map_outer.insert("VariantTuple".into(), array.into());
        assert_eq!(
            MyEnum::VariantTuple(123, 456),
            from_dynamic(&map_outer.into()).unwrap()
        );
    }

    let map_inner = Map::new();
    let mut map_outer = Map::new();
    map_outer.insert("VariantEmptyStruct".into(), map_inner.into());
    assert_eq!(
        MyEnum::VariantEmptyStruct {},
        from_dynamic(&map_outer.into()).unwrap()
    );

    let mut map_inner = Map::new();
    map_inner.insert("a".into(), (123 as INT).into());
    let mut map_outer = Map::new();
    map_outer.insert("VariantStruct".into(), map_inner.into());
    assert_eq!(
        MyEnum::VariantStruct { a: 123 },
        from_dynamic(&map_outer.into()).unwrap()
    );

    Ok(())
}

#[test]
#[cfg(not(feature = "no_object"))]
fn test_serde_de_internally_tagged_enum() -> Result<(), Box<EvalAltResult>> {
    #[derive(Debug, PartialEq, Deserialize)]
    #[serde(tag = "tag", deny_unknown_fields)]
    enum MyEnum {
        VariantEmptyStruct {},
        VariantStruct { a: i32 },
    }

    let mut map = Map::new();
    map.insert("tag".into(), "VariantStruct".into());
    map.insert("a".into(), (123 as INT).into());
    assert_eq!(
        MyEnum::VariantStruct { a: 123 },
        from_dynamic(&map.into()).unwrap()
    );

    let mut map = Map::new();
    map.insert("tag".into(), "VariantEmptyStruct".into());
    assert_eq!(
        MyEnum::VariantEmptyStruct {},
        from_dynamic(&map.into()).unwrap()
    );

    Ok(())
}

#[test]
#[cfg(not(feature = "no_object"))]
fn test_serde_de_adjacently_tagged_enum() -> Result<(), Box<EvalAltResult>> {
    #[derive(Debug, PartialEq, Deserialize)]
    #[serde(tag = "tag", content = "content", deny_unknown_fields)]
    enum MyEnum {
        VariantUnit,
        #[cfg(not(feature = "no_index"))]
        VariantUnitTuple(),
        VariantNewtype(i32),
        #[cfg(not(feature = "no_index"))]
        VariantTuple(i32, i32),
        VariantEmptyStruct {},
        VariantStruct {
            a: i32,
        },
    }

    let mut map_outer = Map::new();
    map_outer.insert("tag".into(), "VariantUnit".into());
    assert_eq!(
        MyEnum::VariantUnit,
        from_dynamic(&map_outer.into()).unwrap()
    );

    #[cfg(not(feature = "no_index"))]
    {
        let array: Array = vec![];
        let mut map_outer = Map::new();
        map_outer.insert("tag".into(), "VariantUnitTuple".into());
        map_outer.insert("content".into(), array.into());
        assert_eq!(
            MyEnum::VariantUnitTuple(),
            from_dynamic(&map_outer.into()).unwrap()
        );
    }

    let mut map_outer = Map::new();
    map_outer.insert("tag".into(), "VariantNewtype".into());
    map_outer.insert("content".into(), (123 as INT).into());
    assert_eq!(
        MyEnum::VariantNewtype(123),
        from_dynamic(&map_outer.into()).unwrap()
    );

    #[cfg(not(feature = "no_index"))]
    {
        let array: Array = vec![(123 as INT).into(), (456 as INT).into()];
        let mut map_outer = Map::new();
        map_outer.insert("tag".into(), "VariantTuple".into());
        map_outer.insert("content".into(), array.into());
        assert_eq!(
            MyEnum::VariantTuple(123, 456),
            from_dynamic(&map_outer.into()).unwrap()
        );
    }

    let map_inner = Map::new();
    let mut map_outer = Map::new();
    map_outer.insert("tag".into(), "VariantEmptyStruct".into());
    map_outer.insert("content".into(), map_inner.into());
    assert_eq!(
        MyEnum::VariantEmptyStruct {},
        from_dynamic(&map_outer.into()).unwrap()
    );

    let mut map_inner = Map::new();
    map_inner.insert("a".into(), (123 as INT).into());
    let mut map_outer = Map::new();
    map_outer.insert("tag".into(), "VariantStruct".into());
    map_outer.insert("content".into(), map_inner.into());
    assert_eq!(
        MyEnum::VariantStruct { a: 123 },
        from_dynamic(&map_outer.into()).unwrap()
    );

    Ok(())
}

#[test]
#[cfg(not(feature = "no_object"))]
fn test_serde_de_untagged_enum() -> Result<(), Box<EvalAltResult>> {
    #[derive(Debug, PartialEq, Deserialize)]
    #[serde(untagged, deny_unknown_fields)]
    enum MyEnum {
        VariantEmptyStruct {},
        VariantStruct1 { a: i32 },
        VariantStruct2 { b: i32 },
    }

    let map = Map::new();
    assert_eq!(
        MyEnum::VariantEmptyStruct {},
        from_dynamic(&map.into()).unwrap()
    );

    let mut map = Map::new();
    map.insert("a".into(), (123 as INT).into());
    assert_eq!(
        MyEnum::VariantStruct1 { a: 123 },
        from_dynamic(&map.into()).unwrap()
    );

    let mut map = Map::new();
    map.insert("b".into(), (123 as INT).into());
    assert_eq!(
        MyEnum::VariantStruct2 { b: 123 },
        from_dynamic(&map.into()).unwrap()
    );

    Ok(())
}

#[test]
#[cfg(feature = "metadata")]
#[cfg(not(feature = "no_object"))]
#[cfg(not(feature = "no_index"))]
fn test_serde_json() -> serde_json::Result<()> {
    let s: ImmutableString = "hello".into();
    assert_eq!(serde_json::to_string(&s)?, r#""hello""#);

    let mut map = Map::new();
    map.insert("a".into(), (123 as INT).into());

    let arr: Array = vec![(1 as INT).into(), (2 as INT).into(), (3 as INT).into()];
    map.insert("b".into(), arr.into());
    map.insert("c".into(), true.into());
    let d: Dynamic = map.into();

    let json = serde_json::to_string(&d)?;

    assert!(json.contains("\"a\":123"));
    assert!(json.contains("\"b\":[1,2,3]"));
    assert!(json.contains("\"c\":true"));

    let d2: Dynamic = serde_json::from_str(&json)?;

    assert!(d2.is::<Map>());

    let mut m = d2.cast::<Map>();

    assert_eq!(m["a"].as_int().unwrap(), 123);
    assert!(m["c"].as_bool().unwrap());

    let a = m.remove("b").unwrap().cast::<Array>();

    assert_eq!(a.len(), 3);
    assert_eq!(format!("{:?}", a), "[1, 2, 3]");

    Ok(())
}

#[test]
#[cfg(not(feature = "no_object"))]
fn test_serde_optional() -> Result<(), Box<EvalAltResult>> {
    #[derive(Debug, Clone, PartialEq, Eq, Deserialize)]
    struct TestStruct {
        foo: Option<char>,
    }

    let mut engine = Engine::new();
    engine.register_type_with_name::<TestStruct>("TestStruct");

    let r = engine.eval::<Dynamic>("#{ foo: 'a' }")?;

    assert_eq!(
        from_dynamic::<TestStruct>(&r)?,
        TestStruct { foo: Some('a') }
    );

    let r = engine.eval::<Dynamic>("#{ foo: () }")?;

    assert_eq!(from_dynamic::<TestStruct>(&r)?, TestStruct { foo: None });

    let r = engine.eval::<Dynamic>("#{ }")?;

    assert_eq!(from_dynamic::<TestStruct>(&r)?, TestStruct { foo: None });

    Ok(())
}