You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: validation.rs
    path of file: ./repos/rkyv/rkyv_dyn_test/src
    
    the code of the file until where you have to start completion: #[cfg(test)]
mod tests {
    #[cfg_attr(feature = "wasm", allow(unused_imports))]
    use bytecheck::CheckBytes;
    #[cfg_attr(feature = "wasm", allow(unused_imports))]
    use rkyv::{
        check_archived_root,
        ser::{serializers::AllocSerializer, Serializer},
        validation::validators::DefaultValidator,
        Archive, Archived, Serialize,
    };
    #[cfg_attr(feature = "wasm", allow(unused_imports))]
    use rkyv_dyn::archive_dyn;

    #[cfg_attr(feature = "wasm", allow(dead_code))]
    fn serialize_and_check<T: Serialize<AllocSerializer<256>>>(value: &T)
    where
        T::Archived: for<'a> CheckBytes<DefaultValidator<'a>>,
    {
        let mut serializer = AllocSerializer::<256>::default();
        serializer.serialize_value(value).unwrap();
        let buf = serializer.into_serializer().into_inner();
        check_archived_root::<T>(buf.as_ref()).unwrap(
    
    fn check_dyn() {
        #[archive_dyn]
        pub trait TestTrait {
            fn get_id(&self) -> i32;
        }

        #[derive(Archive, Serialize)]
        #[archive_attr(derive(CheckBytes))]
        pub struct Test {
            id: i32,
        }

        #[archive_dyn]
        impl TestTrait for Test {
            fn get_id(&self) -> i32 {
                self.id
            }
        }

        impl TestTrait for Archived<Test> {
            fn get_id(&self) -> i32 {
                self.id.into()
            }
        }

        let value: Box<dyn SerializeTestTrait> = Box::new(Test { id: 42 });

        serialize_and_check(&value);

        #[derive(Archive, Serialize)]
        pub struct TestUnchecked {
            id: i32,
        }

        #[archive_dyn]
        impl TestTrait for TestUnchecked {
            fn get_id(&self) -> i32 {
                self.id
            }
        }

        impl TestTrait for Archived<TestUnchecked> {
            fn get_id(&self) -> i32 {
                self.id.into()
            }
        }

        let value: Box<dyn SerializeTestTrait> =
            Box::new(TestUnchecked { id: 42 });

        let mut serializer = AllocSerializer::<256>::default();
        serializer.serialize_value(&value).unwrap();
        let buf = serializer.into_serializer().into_inner();
        if let Ok(_) =
            check_archived_root::<Box<dyn SerializeTestTrait>>(buf.as_ref())
        {
            panic!("check passed for type that does not implement CheckBytes");
        }
    }