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

    fn gen_spec_whole() -> SubValueSpec {
        SubValueSpec::whole(DatumType::Str)
    }
    fn gen_spec_partial_depth1() -> SubValueSpec {
        SubValueSpec {
            member_idxs: vec![1],
            datum_type: DatumType::Str,
        }
    }
    fn gen_spec_partial_depth2() -> SubValueSpec {
        SubValueSpec {
            member_idxs: vec![2, 1],
            datum_type: DatumType::Str,
        }
    }

    mod test_serde {
        use super::*;
        use std::io::Cursor;

        fn verify_serde(spec: SubValueSpec) -> Result<()> {
            let mut buf = vec![];
            spec.ser(&mut buf)?;
            let deserialized = SubValueSpec::deser(&mut Cursor::new(&buf))?;
            assert_eq!(spec, deserialized);
            Ok(())
        }

        #[test]
        fn test_serde() -> Result<()> {
            verify_serde(gen_spec_whole())?;
            verify_serde(gen_spec_partial_depth1())?;
            verify_serde(gen_spec_partial_depth2())?;
            Ok(())
        }
    }

    mod test_extract {
        use super::*;
        use crate::types::{PVShared, SubValue};

        fn verify_extract(spec: SubValueSpec, pv: PVShared, exp_sv: Option<SubValue>) {
            let pv = Arc::new(pv);
            let act_sv = spec.extract(&pv);
            match (exp_sv, act_sv) {
                (None, None) => (),
                (Some(exp_sv), Some(act_sv)) => {
                    assert_eq!(&exp_sv, &act_sv as &SubValue);
                }
                etc => panic!("{etc:?}"),
            }
        }

        #[test]
        fn test_extract() {
            verify_extract(
                gen_spec_whole(),
                PVShared::from(Datum::Str(String::from("asdf"))),
                Some(SubValue(Datum::Str(String::from("asdf")))),
            );
            verify_extract(gen_spec_whole(), PVShared::from(Datum::I64(123)), None);

            verify_extract(
                gen_spec_partial_depth1(),
                PVShared::from(Datum::Tuple(vec![
                    Datum::I64(123),
                    Datum::Str(String::from("asdf")),
                    Datum::I64(123),
                ])),
                Some(SubValue(Datum::Str(String::from("asdf")))),
            );
            verify_extract(
                gen_spec_partial_depth1(),
                PVShared::from(Datum::Tuple(vec![
                    Datum::I64(123),
                    Datum::I64(123), // Not string.
                    Datum::I64(123),
                ])),
                None,
            );
            verify_extract(
                gen_spec_partial_depth1(),
                PVShared::from(Datum::Tuple(vec![
                    Datum::I64(123),
                    // Missing member_idx 1.
                ])),
                None,
            );
            verify_extract(
                gen_spec_partial_depth1(),
                PVShared::from(Datum::Str(String::from("asdf"))), // Insufficient depth.
                None,
            );

            verify_extract(
                gen_spec_partial_depth2(),
                PVShared::from(Datum::Tuple(vec![
                    Datum::I64(123),
                    Datum::Str(String::from("asdf")),
                    Datum::Tuple(vec![Datum::I64(456), Datum::Str(String::from("asdf2"))]),
                ])),
                Some(SubValue(Datum::Str(String::from("asdf2")))),
            );
            verify_extract(
                gen_spec_partial_depth2(),
                PVShared::from(Datum::Tuple(vec![
                    Datum::I64(123),
                    Datum::Str(String::from("asdf")),
                    Datum::Tuple(vec![
                        Datum::I64(456),
                        Datum::I64(456), // Not string.
                    ]),
                ])),
                None,
            );
            verify_extract(
                gen_spec_partial_depth2(),
                PVShared::from(Datum::Tuple(vec![
                    Datum::I64(123),
                    Datum::Str(String::from("asdf")),
                    Datum::Tuple(vec![
                        Datum::I64(456),
                        // Missing member_idx 1.
                    ]),
                ])),
                None,
            );
            verify_extract(
                gen_spec_partial_depth2(),
                PVShared::from(Datum::Tuple(vec![
                    Datum::I64(123),
                    Datum::Str(String::from("asdf")),
                    Datum::I64(123), // Insufficient depth.
                ])),
                None,
            );
            verify_extract(
                gen_spec_partial_depth2(),
                PVShared::from(Datum::Str(String::from("asdf"))), // Insufficient depth.
                None,
            );
        }
    }
}