use git_mailmap::Snapshot;use git_testtools::fixture_bytes; #[test]fn try_resolve() {    let snapshot = Snapshot::from_bytes(&fixture_bytes("typical.txt"));    assert_eq!(        snapshot.try_resolve(signature("Foo", "Joe@example.com").to_ref()),        Some(signature("Joe R. Developer", "joe@example.com")),        "resolved signatures contain all original fields, and normalize the email as well to match the one that it was looked up with"    );    assert_eq!(        snapshot.try_resolve(signature("Joe", "bugs@example.com").to_ref()),        Some(signature("Joe R. Developer", "joe@example.com")),        "name and email can be mapped specifically"    );     assert_eq!(        snapshot.try_resolve(signature("Jane", "jane@laptop.(none)").to_ref()),        Some(signature("Jane Doe", "jane@example.com")),        "fix name and email by email"    );    assert_eq!(        snapshot.try_resolve(signature("Jane", "jane@desktop.(none)").to_ref()),        Some(signature("Jane Doe", "jane@example.com")),        "fix name and email by other email"    );     assert_eq!(        snapshot.try_resolve(signature("janE", "Bugs@example.com").to_ref()),        Some(signature("Jane Doe", "jane@example.com")),        "name and email can be mapped specifically, case insensitive matching of name"    );     let sig = signature("Jane", "other@example.com");    assert_eq!(snapshot.try_resolve(sig.to_ref()), None, "unmatched email");     assert_eq!(        snapshot.resolve(sig.to_ref()),        sig,        "resolution always works here, returning a copy of the original"    );     let sig = signature("Jean", "bugs@example.com");    assert_eq!(        snapshot.try_resolve(sig.to_ref()),        None,        "matched email, unmatched name"    );    assert_eq!(snapshot.resolve(sig.to_ref()), sig);     assert_eq!(snapshot.entries().len(), 5);} #[test]fn non_name_and_name_mappings_will_not_clash() {    let entries = vec![        // add mapping from email        git_mailmap::Entry::change_name_by_email("new-name", "old-email"),        // add mapping from name and email        git_mailmap::Entry::change_name_and_email_by_name_and_email(            "other-new-name",            "other-new-email",            "old-name",            "old-email",        ),    ];    for entries in vec![entries.clone().into_iter().rev().collect::<Vec<_>>(), entries] {        let snapshot = Snapshot::new(entries);         assert_eq!(            snapshot.try_resolve(signature("replace-by-email", "Old-Email").to_ref()),            Some(signature("new-name", "old-email")),            "it can match by email only, and the email is normalized"        );        assert_eq!(            snapshot.try_resolve(signature("old-name", "Old-Email").to_ref()),            Some(signature("other-new-name", "other-new-email")),            "it can match by email and name as well"        );         assert_eq!(snapshot.entries().len(), 2);    }} #[test]fn overwrite_entries() {    let snapshot = Snapshot::from_bytes(&fixture_bytes("overwrite.txt"));    assert_eq!(        snapshot.try_resolve(signature("does not matter", "old-a-email").to_ref()),        Some(signature("A-overwritten", "old-a-email")),        "email only by email"    );     assert_eq!(        snapshot.try_resolve(signature("to be replaced", "old-b-EMAIL").to_ref()),        Some(signature("B-overwritten", "new-b-email-overwritten")),        "name and email by email"    );     assert_eq!(        snapshot.try_resolve(signature("old-c", "old-C-email").to_ref()),        Some(signature("C-overwritten", "new-c-email-overwritten")),        "name and email by name and email"    );     assert_eq!(        snapshot.try_resolve(signature("unchanged", "old-d-email").to_ref()),        Some(signature("unchanged", "new-d-email-overwritten")),        "email by email"    );     assert_eq!(snapshot.entries().len(), 4);} fn signature(name: &str, email: &str) -> git_actor::Signature {    git_actor::Signature {        name: name.into(),        email: email.into(),        time: git_actor::Time {            // marker            seconds_since_unix_epoch: 42,            offset_in_seconds: 53,            sign: git_actor::Sign::Minus,        },    }}