///

    /// Nb. if the verdict is set and a subsequent review is made with

    /// the verdict as `None`, the original verdict will be nullified.

    ///

    /// Nb. if the comment is set and a subsequent review is made with

    /// the comment as `None`, the original comment will be nullified.

    fn test_patch_review_remove_fields() {

        let tmp = tempfile::tempdir().unwrap();

        let (_, signer, project) = test::setup::context(&tmp);

        let base = git::Oid::from_str("cb18e95ada2bb38aadd8e6cef0963ce37a87add3").unwrap();

        let oid = git::Oid::from_str("518d5069f94c03427f694bb494ac1cd7d1339380").unwrap();

        let mut patches = Patches::open(&project).unwrap();

        let mut patch = patches

            .create(

                "My first patch",

                "Blah blah blah.",

                MergeTarget::Delegates,

                base,

                oid,

                &[],

                &signer,

            )

            .unwrap();

        let (rid, _) = patch.latest().unwrap();

        let rid = *rid;

        patch

            .review(

                rid,

                Some(Verdict::Reject),

                Some("Nah".to_owned()),

                vec![],

                &signer,

            )

            .unwrap();

        patch.review(rid, None, None, vec![], &signer).unwrap();

        let id = patch.id;

        let patch = patches.get_mut(&id).unwrap();

        let (_, revision) = patch.latest().unwrap();

        let review = revision.reviews.get(signer.public_key()).unwrap();

        assert_eq!(review.verdict(), None);

        assert_eq!(review.comment(), None);

    }

    #[test]