use serde::{Deserialize, Serialize};

#[derive(Deserialize, Serialize)]
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub struct Foo {
    #[serde(skip_serializing_if = "Option::is_none")]
    pub bar: Option<()>,
}

#[cfg(test)]
mod tests {
    use super::*;

    fn foo() -> Foo {
        Foo {
            bar: None,
        }
    }

    #[test]
    fn bincode_roundtrip() {
        let f = foo();
        let s = bincode::serialize(&f).unwrap();
        let new_f = bincode::deserialize(&s).unwrap();
        assert_eq!(f, new_f);
    }
}