refactor: move domain inline tests to separate files under tests/

Match the application crate convention: each source file references its
tests via #[cfg(test)] #[path = "tests/filename.rs"] mod tests; with
the test code in a sibling tests/ directory.

- events.rs       -> tests/events.rs
- value_objects.rs -> tests/value_objects.rs
- models/mod.rs   -> models/tests/mod.rs  (renamed from tests.rs)
- models/person.rs -> models/tests/person.rs
- models/goal.rs   -> models/tests/goal.rs
- models/watch_event.rs -> models/tests/watch_event.rs
- services/review_history.rs -> services/tests/review_history.rs

crates/domain/src/events.rs

@@ -135,21 +135,5 @@ impl EventEnvelope {
 }
 
 #[cfg(test)]
-mod tests {
+#[path = "tests/events.rs"]
-    use super::*;
+mod tests;
-    use crate::value_objects::UserId;
-
-    #[test]
-    fn follow_accepted_matches() {
-        let uid = UserId::from_uuid(uuid::Uuid::new_v4());
-        let event = DomainEvent::FollowAccepted {
-            local_user_id: uid.clone(),
-            remote_actor_url: "https://remote.example/users/alice".to_string(),
-            outbox_url: "https://remote.example/users/alice/outbox".to_string(),
-        };
-        let DomainEvent::FollowAccepted { outbox_url, .. } = event else {
-            panic!("wrong variant");
-        };
-        assert_eq!(outbox_url, "https://remote.example/users/alice/outbox");
-    }
-}

crates/domain/src/models/goal.rs

@@ -111,96 +111,5 @@ impl GoalWithProgress {
 }
 
 #[cfg(test)]
-mod tests {
+#[path = "tests/goal.rs"]
-    use super::*;
+mod tests;
-    use crate::value_objects::UserId;
-
-    fn make_goal(year: u16, target: u32) -> Result<Goal, DomainError> {
-        Goal::new(UserId::generate(), year, target, GoalType::Movies)
-    }
-
-    #[test]
-    fn new_goal_valid() {
-        let g = make_goal(2024, 52);
-        assert!(g.is_ok());
-        let g = g.unwrap();
-        assert_eq!(g.year(), 2024);
-        assert_eq!(g.target_count(), 52);
-    }
-
-    #[test]
-    fn new_goal_rejects_year_before_2020() {
-        assert!(make_goal(2019, 10).is_err());
-    }
-
-    #[test]
-    fn new_goal_rejects_zero_target() {
-        assert!(make_goal(2024, 0).is_err());
-    }
-
-    #[test]
-    fn update_target_valid() {
-        let mut g = make_goal(2024, 10).unwrap();
-        assert!(g.update_target(50).is_ok());
-        assert_eq!(g.target_count(), 50);
-    }
-
-    #[test]
-    fn update_target_rejects_zero() {
-        let mut g = make_goal(2024, 10).unwrap();
-        assert!(g.update_target(0).is_err());
-    }
-
-    #[test]
-    fn from_persistence_preserves_fields() {
-        let id = GoalId::generate();
-        let uid = UserId::generate();
-        let ts = chrono::Utc::now().naive_utc();
-        let g = Goal::from_persistence(id.clone(), uid.clone(), 2025, 42, GoalType::Movies, ts);
-        assert_eq!(*g.id(), id);
-        assert_eq!(*g.user_id(), uid);
-        assert_eq!(g.year(), 2025);
-        assert_eq!(g.target_count(), 42);
-        assert_eq!(g.created_at(), &ts);
-    }
-
-    #[test]
-    fn percentage_calculation() {
-        let g = make_goal(2024, 100).unwrap();
-        let wp = GoalWithProgress {
-            goal: g,
-            current_count: 50,
-        };
-        assert!((wp.percentage() - 50.0).abs() < f64::EPSILON);
-    }
-
-    #[test]
-    fn percentage_caps_at_100() {
-        let g = make_goal(2024, 10).unwrap();
-        let wp = GoalWithProgress {
-            goal: g,
-            current_count: 20,
-        };
-        assert!((wp.percentage() - 100.0).abs() < f64::EPSILON);
-    }
-
-    #[test]
-    fn is_complete() {
-        let g = make_goal(2024, 10).unwrap();
-        let wp = GoalWithProgress {
-            goal: g,
-            current_count: 10,
-        };
-        assert!(wp.is_complete());
-    }
-
-    #[test]
-    fn is_not_complete() {
-        let g = make_goal(2024, 10).unwrap();
-        let wp = GoalWithProgress {
-            goal: g,
-            current_count: 9,
-        };
-        assert!(!wp.is_complete());
-    }
-}

crates/domain/src/models/mod.rs

@@ -92,5 +92,5 @@ pub enum ExportFormat {
 }
 
 #[cfg(test)]
-#[path = "tests.rs"]
+#[path = "tests/mod.rs"]
 mod tests;

crates/domain/src/models/person.rs

@@ -113,60 +113,5 @@ pub struct CrewCredit {
 }
 
 #[cfg(test)]
-mod tests {
+#[path = "tests/person.rs"]
-    use super::*;
+mod tests;
-
-    #[test]
-    fn person_new() {
-        let ext = ExternalPersonId::new("tmdb:12345");
-        let pid = PersonId::from_external(&ext);
-        let p = Person::new(
-            pid,
-            ext,
-            "Keanu Reeves".into(),
-            Some("Acting".into()),
-            Some("/profiles/keanu.jpg".into()),
-        );
-        assert_eq!(p.name(), "Keanu Reeves");
-        assert_eq!(p.known_for_department(), Some("Acting"));
-        assert_eq!(p.profile_path(), Some("/profiles/keanu.jpg"));
-        assert_eq!(p.external_id().value(), "tmdb:12345");
-        assert_eq!(p.external_id().tmdb_id(), Some(12345));
-    }
-
-    #[test]
-    fn person_id_from_external() {
-        let ext = ExternalPersonId::new("tmdb:99999");
-        let pid = PersonId::from_external(&ext);
-        // UUIDv5 is deterministic — just ensure it's a valid uuid
-        let _ = pid.value();
-    }
-
-    #[test]
-    fn person_id_deterministic() {
-        let ext = ExternalPersonId::new("tmdb:42");
-        let a = PersonId::from_external(&ext);
-        let b = PersonId::from_external(&ext);
-        assert_eq!(a, b);
-    }
-
-    #[test]
-    fn person_credits_default_empty() {
-        let ext = ExternalPersonId::new("tmdb:1");
-        let pid = PersonId::from_external(&ext);
-        let p = Person::new(pid, ext, "Test".into(), None, None);
-        let credits = PersonCredits {
-            person: p,
-            cast: vec![],
-            crew: vec![],
-        };
-        assert!(credits.cast.is_empty());
-        assert!(credits.crew.is_empty());
-    }
-
-    #[test]
-    fn external_person_id_tmdb_id_none_for_other() {
-        let ext = ExternalPersonId::new("imdb:nm0000206");
-        assert_eq!(ext.tmdb_id(), None);
-    }
-}

crates/domain/src/models/tests/goal.rs

@@ -0,0 +1,91 @@
+use super::*;
+use crate::value_objects::UserId;
+
+fn make_goal(year: u16, target: u32) -> Result<Goal, DomainError> {
+    Goal::new(UserId::generate(), year, target, GoalType::Movies)
+}
+
+#[test]
+fn new_goal_valid() {
+    let g = make_goal(2024, 52);
+    assert!(g.is_ok());
+    let g = g.unwrap();
+    assert_eq!(g.year(), 2024);
+    assert_eq!(g.target_count(), 52);
+}
+
+#[test]
+fn new_goal_rejects_year_before_2020() {
+    assert!(make_goal(2019, 10).is_err());
+}
+
+#[test]
+fn new_goal_rejects_zero_target() {
+    assert!(make_goal(2024, 0).is_err());
+}
+
+#[test]
+fn update_target_valid() {
+    let mut g = make_goal(2024, 10).unwrap();
+    assert!(g.update_target(50).is_ok());
+    assert_eq!(g.target_count(), 50);
+}
+
+#[test]
+fn update_target_rejects_zero() {
+    let mut g = make_goal(2024, 10).unwrap();
+    assert!(g.update_target(0).is_err());
+}
+
+#[test]
+fn from_persistence_preserves_fields() {
+    let id = GoalId::generate();
+    let uid = UserId::generate();
+    let ts = chrono::Utc::now().naive_utc();
+    let g = Goal::from_persistence(id.clone(), uid.clone(), 2025, 42, GoalType::Movies, ts);
+    assert_eq!(*g.id(), id);
+    assert_eq!(*g.user_id(), uid);
+    assert_eq!(g.year(), 2025);
+    assert_eq!(g.target_count(), 42);
+    assert_eq!(g.created_at(), &ts);
+}
+
+#[test]
+fn percentage_calculation() {
+    let g = make_goal(2024, 100).unwrap();
+    let wp = GoalWithProgress {
+        goal: g,
+        current_count: 50,
+    };
+    assert!((wp.percentage() - 50.0).abs() < f64::EPSILON);
+}
+
+#[test]
+fn percentage_caps_at_100() {
+    let g = make_goal(2024, 10).unwrap();
+    let wp = GoalWithProgress {
+        goal: g,
+        current_count: 20,
+    };
+    assert!((wp.percentage() - 100.0).abs() < f64::EPSILON);
+}
+
+#[test]
+fn is_complete() {
+    let g = make_goal(2024, 10).unwrap();
+    let wp = GoalWithProgress {
+        goal: g,
+        current_count: 10,
+    };
+    assert!(wp.is_complete());
+}
+
+#[test]
+fn is_not_complete() {
+    let g = make_goal(2024, 10).unwrap();
+    let wp = GoalWithProgress {
+        goal: g,
+        current_count: 9,
+    };
+    assert!(!wp.is_complete());
+}

crates/domain/src/models/tests/person.rs

@@ -0,0 +1,55 @@
+use super::*;
+
+#[test]
+fn person_new() {
+    let ext = ExternalPersonId::new("tmdb:12345");
+    let pid = PersonId::from_external(&ext);
+    let p = Person::new(
+        pid,
+        ext,
+        "Keanu Reeves".into(),
+        Some("Acting".into()),
+        Some("/profiles/keanu.jpg".into()),
+    );
+    assert_eq!(p.name(), "Keanu Reeves");
+    assert_eq!(p.known_for_department(), Some("Acting"));
+    assert_eq!(p.profile_path(), Some("/profiles/keanu.jpg"));
+    assert_eq!(p.external_id().value(), "tmdb:12345");
+    assert_eq!(p.external_id().tmdb_id(), Some(12345));
+}
+
+#[test]
+fn person_id_from_external() {
+    let ext = ExternalPersonId::new("tmdb:99999");
+    let pid = PersonId::from_external(&ext);
+    // UUIDv5 is deterministic — just ensure it's a valid uuid
+    let _ = pid.value();
+}
+
+#[test]
+fn person_id_deterministic() {
+    let ext = ExternalPersonId::new("tmdb:42");
+    let a = PersonId::from_external(&ext);
+    let b = PersonId::from_external(&ext);
+    assert_eq!(a, b);
+}
+
+#[test]
+fn person_credits_default_empty() {
+    let ext = ExternalPersonId::new("tmdb:1");
+    let pid = PersonId::from_external(&ext);
+    let p = Person::new(pid, ext, "Test".into(), None, None);
+    let credits = PersonCredits {
+        person: p,
+        cast: vec![],
+        crew: vec![],
+    };
+    assert!(credits.cast.is_empty());
+    assert!(credits.crew.is_empty());
+}
+
+#[test]
+fn external_person_id_tmdb_id_none_for_other() {
+    let ext = ExternalPersonId::new("imdb:nm0000206");
+    assert_eq!(ext.tmdb_id(), None);
+}

crates/domain/src/models/tests/watch_event.rs

@@ -0,0 +1,136 @@
+use super::*;
+
+fn ts() -> NaiveDateTime {
+    chrono::NaiveDate::from_ymd_opt(2024, 6, 1)
+        .unwrap()
+        .and_hms_opt(12, 0, 0)
+        .unwrap()
+}
+
+#[test]
+fn watch_event_new_has_pending_status() {
+    let e = WatchEvent::new(
+        UserId::generate(),
+        "Dune".into(),
+        Some(2021),
+        None,
+        WatchEventSource::Jellyfin,
+        ts(),
+        None,
+    );
+    assert_eq!(*e.status(), WatchEventStatus::Pending);
+}
+
+#[test]
+fn watch_event_getters() {
+    let uid = UserId::generate();
+    let mid = MovieId::generate();
+    let e = WatchEvent::new(
+        uid.clone(),
+        "Arrival".into(),
+        Some(2016),
+        Some("ext123".into()),
+        WatchEventSource::Plex,
+        ts(),
+        Some(mid.clone()),
+    );
+    assert_eq!(*e.user_id(), uid);
+    assert_eq!(e.title(), "Arrival");
+    assert_eq!(e.year(), Some(2016));
+    assert_eq!(e.external_metadata_id(), Some("ext123"));
+    assert_eq!(*e.source(), WatchEventSource::Plex);
+    assert_eq!(e.watched_at(), &ts());
+    assert_eq!(*e.movie_id().unwrap(), mid);
+}
+
+#[test]
+fn webhook_token_new() {
+    let uid = UserId::generate();
+    let t = WebhookToken::new(
+        uid.clone(),
+        "hash123".into(),
+        WatchEventSource::Jellyfin,
+        Some("my server".into()),
+    );
+    assert_eq!(*t.user_id(), uid);
+    assert_eq!(t.token_hash(), "hash123");
+    assert_eq!(*t.provider(), WatchEventSource::Jellyfin);
+    assert_eq!(t.label(), Some("my server"));
+    assert!(t.last_used_at().is_none());
+}
+
+#[test]
+fn webhook_token_from_persistence() {
+    let id = WebhookTokenId::generate();
+    let uid = UserId::generate();
+    let created = ts();
+    let used = chrono::NaiveDate::from_ymd_opt(2024, 7, 1)
+        .unwrap()
+        .and_hms_opt(0, 0, 0)
+        .unwrap();
+    let t = WebhookToken::from_persistence(
+        id.clone(),
+        uid.clone(),
+        "h".into(),
+        WatchEventSource::Plex,
+        None,
+        created,
+        Some(used),
+    );
+    assert_eq!(*t.id(), id);
+    assert_eq!(*t.user_id(), uid);
+    assert_eq!(t.token_hash(), "h");
+    assert_eq!(*t.provider(), WatchEventSource::Plex);
+    assert_eq!(t.label(), None);
+    assert_eq!(t.created_at(), &created);
+    assert_eq!(t.last_used_at(), Some(&used));
+}
+
+#[test]
+fn watch_event_source_display() {
+    assert_eq!(WatchEventSource::Jellyfin.to_string(), "jellyfin");
+    assert_eq!(WatchEventSource::Plex.to_string(), "plex");
+}
+
+#[test]
+fn watch_event_source_from_str() {
+    assert_eq!(
+        "jellyfin".parse::<WatchEventSource>().unwrap(),
+        WatchEventSource::Jellyfin
+    );
+    assert_eq!(
+        "plex".parse::<WatchEventSource>().unwrap(),
+        WatchEventSource::Plex
+    );
+    assert!("unknown".parse::<WatchEventSource>().is_err());
+}
+
+#[test]
+fn watch_event_status_display() {
+    assert_eq!(WatchEventStatus::Pending.to_string(), "pending");
+    assert_eq!(WatchEventStatus::Confirmed.to_string(), "confirmed");
+    assert_eq!(WatchEventStatus::Dismissed.to_string(), "dismissed");
+}
+
+#[test]
+fn watch_event_status_from_str() {
+    for s in ["pending", "confirmed", "dismissed"] {
+        let parsed: WatchEventStatus = s.parse().unwrap();
+        assert_eq!(parsed.to_string(), s);
+    }
+    assert!("bogus".parse::<WatchEventStatus>().is_err());
+}
+
+#[test]
+fn parsed_playback_event_fields() {
+    let p = ParsedPlaybackEvent {
+        title: "Matrix".into(),
+        year: Some(1999),
+        tmdb_id: Some("603".into()),
+        imdb_id: Some("tt0133093".into()),
+    };
+    assert_eq!(p.title, "Matrix");
+    assert_eq!(p.year, Some(1999));
+    assert_eq!(p.tmdb_id.as_deref(), Some("603"));
+    assert_eq!(p.imdb_id.as_deref(), Some("tt0133093"));
+}

crates/domain/src/models/watch_event.rs

@@ -236,141 +236,6 @@ pub struct ParsedPlaybackEvent {
 }
 
 #[cfg(test)]
-mod tests {
+#[path = "tests/watch_event.rs"]
-    use super::*;
+mod tests;
 
-    fn ts() -> NaiveDateTime {
-        chrono::NaiveDate::from_ymd_opt(2024, 6, 1)
-            .unwrap()
-            .and_hms_opt(12, 0, 0)
-            .unwrap()
-    }
-
-    #[test]
-    fn watch_event_new_has_pending_status() {
-        let e = WatchEvent::new(
-            UserId::generate(),
-            "Dune".into(),
-            Some(2021),
-            None,
-            WatchEventSource::Jellyfin,
-            ts(),
-            None,
-        );
-        assert_eq!(*e.status(), WatchEventStatus::Pending);
-    }
-
-    #[test]
-    fn watch_event_getters() {
-        let uid = UserId::generate();
-        let mid = MovieId::generate();
-        let e = WatchEvent::new(
-            uid.clone(),
-            "Arrival".into(),
-            Some(2016),
-            Some("ext123".into()),
-            WatchEventSource::Plex,
-            ts(),
-            Some(mid.clone()),
-        );
-        assert_eq!(*e.user_id(), uid);
-        assert_eq!(e.title(), "Arrival");
-        assert_eq!(e.year(), Some(2016));
-        assert_eq!(e.external_metadata_id(), Some("ext123"));
-        assert_eq!(*e.source(), WatchEventSource::Plex);
-        assert_eq!(e.watched_at(), &ts());
-        assert_eq!(*e.movie_id().unwrap(), mid);
-    }
-
-    #[test]
-    fn webhook_token_new() {
-        let uid = UserId::generate();
-        let t = WebhookToken::new(
-            uid.clone(),
-            "hash123".into(),
-            WatchEventSource::Jellyfin,
-            Some("my server".into()),
-        );
-        assert_eq!(*t.user_id(), uid);
-        assert_eq!(t.token_hash(), "hash123");
-        assert_eq!(*t.provider(), WatchEventSource::Jellyfin);
-        assert_eq!(t.label(), Some("my server"));
-        assert!(t.last_used_at().is_none());
-    }
-
-    #[test]
-    fn webhook_token_from_persistence() {
-        let id = WebhookTokenId::generate();
-        let uid = UserId::generate();
-        let created = ts();
-        let used = chrono::NaiveDate::from_ymd_opt(2024, 7, 1)
-            .unwrap()
-            .and_hms_opt(0, 0, 0)
-            .unwrap();
-        let t = WebhookToken::from_persistence(
-            id.clone(),
-            uid.clone(),
-            "h".into(),
-            WatchEventSource::Plex,
-            None,
-            created,
-            Some(used),
-        );
-        assert_eq!(*t.id(), id);
-        assert_eq!(*t.user_id(), uid);
-        assert_eq!(t.token_hash(), "h");
-        assert_eq!(*t.provider(), WatchEventSource::Plex);
-        assert_eq!(t.label(), None);
-        assert_eq!(t.created_at(), &created);
-        assert_eq!(t.last_used_at(), Some(&used));
-    }
-
-    #[test]
-    fn watch_event_source_display() {
-        assert_eq!(WatchEventSource::Jellyfin.to_string(), "jellyfin");
-        assert_eq!(WatchEventSource::Plex.to_string(), "plex");
-    }
-
-    #[test]
-    fn watch_event_source_from_str() {
-        assert_eq!(
-            "jellyfin".parse::<WatchEventSource>().unwrap(),
-            WatchEventSource::Jellyfin
-        );
-        assert_eq!(
-            "plex".parse::<WatchEventSource>().unwrap(),
-            WatchEventSource::Plex
-        );
-        assert!("unknown".parse::<WatchEventSource>().is_err());
-    }
-
-    #[test]
-    fn watch_event_status_display() {
-        assert_eq!(WatchEventStatus::Pending.to_string(), "pending");
-        assert_eq!(WatchEventStatus::Confirmed.to_string(), "confirmed");
-        assert_eq!(WatchEventStatus::Dismissed.to_string(), "dismissed");
-    }
-
-    #[test]
-    fn watch_event_status_from_str() {
-        for s in ["pending", "confirmed", "dismissed"] {
-            let parsed: WatchEventStatus = s.parse().unwrap();
-            assert_eq!(parsed.to_string(), s);
-        }
-        assert!("bogus".parse::<WatchEventStatus>().is_err());
-    }
-
-    #[test]
-    fn parsed_playback_event_fields() {
-        let p = ParsedPlaybackEvent {
-            title: "Matrix".into(),
-            year: Some(1999),
-            tmdb_id: Some("603".into()),
-            imdb_id: Some("tt0133093".into()),
-        };
-        assert_eq!(p.title, "Matrix");
-        assert_eq!(p.year, Some(1999));
-        assert_eq!(p.tmdb_id.as_deref(), Some("603"));
-        assert_eq!(p.imdb_id.as_deref(), Some("tt0133093"));
-    }
-}

crates/domain/src/services/review_history.rs

@@ -53,81 +53,5 @@ impl ReviewHistoryAnalyzer {
 }
 
 #[cfg(test)]
-mod tests {
+#[path = "tests/review_history.rs"]
-    use super::*;
+mod tests;
-    use crate::models::{Movie, Review, ReviewHistory};
-    use crate::value_objects::{MovieId, MovieTitle, Rating, ReleaseYear, UserId};
-    use chrono::{NaiveDate, NaiveDateTime, NaiveTime};
-
-    fn make_movie() -> Movie {
-        Movie::new(
-            None,
-            MovieTitle::new("Test".into()).unwrap(),
-            ReleaseYear::new(2024).unwrap(),
-            None,
-            None,
-        )
-    }
-
-    fn dt(year: i32, month: u32, day: u32) -> NaiveDateTime {
-        NaiveDateTime::new(
-            NaiveDate::from_ymd_opt(year, month, day).unwrap(),
-            NaiveTime::from_hms_opt(12, 0, 0).unwrap(),
-        )
-    }
-
-    fn review_with_rating(movie_id: &MovieId, rating: u8, watched_at: NaiveDateTime) -> Review {
-        let user_id = UserId::generate();
-        Review::new(
-            movie_id.clone(),
-            user_id,
-            Rating::new(rating).unwrap(),
-            None,
-            watched_at,
-        )
-        .unwrap()
-    }
-
-    #[test]
-    fn neutral_when_empty() {
-        let movie = make_movie();
-        let history = ReviewHistory::new(movie, vec![]);
-        let trend = ReviewHistoryAnalyzer::rating_trend(&history).unwrap();
-        assert_eq!(trend, Trend::Neutral);
-    }
-
-    #[test]
-    fn neutral_when_single_review() {
-        let movie = make_movie();
-        let r = review_with_rating(movie.id(), 4, dt(2024, 1, 1));
-        let history = ReviewHistory::new(movie, vec![r]);
-        let trend = ReviewHistoryAnalyzer::rating_trend(&history).unwrap();
-        assert_eq!(trend, Trend::Neutral);
-    }
-
-    #[test]
-    fn improved_when_latest_above_average() {
-        let movie = make_movie();
-        let viewings = vec![
-            review_with_rating(movie.id(), 2, dt(2024, 1, 1)),
-            review_with_rating(movie.id(), 3, dt(2024, 2, 1)),
-            review_with_rating(movie.id(), 5, dt(2024, 3, 1)),
-        ];
-        let history = ReviewHistory::new(movie, viewings);
-        let trend = ReviewHistoryAnalyzer::rating_trend(&history).unwrap();
-        assert_eq!(trend, Trend::Improved);
-    }
-
-    #[test]
-    fn declined_when_latest_below_average() {
-        let movie = make_movie();
-        let viewings = vec![
-            review_with_rating(movie.id(), 5, dt(2024, 1, 1)),
-            review_with_rating(movie.id(), 4, dt(2024, 2, 1)),
-            review_with_rating(movie.id(), 2, dt(2024, 3, 1)),
-        ];
-        let history = ReviewHistory::new(movie, viewings);
-        let trend = ReviewHistoryAnalyzer::rating_trend(&history).unwrap();
-        assert_eq!(trend, Trend::Declined);
-    }
-}

crates/domain/src/services/tests/review_history.rs

@@ -0,0 +1,76 @@
+use super::*;
+use crate::models::{Movie, Review, ReviewHistory};
+use crate::value_objects::{MovieId, MovieTitle, Rating, ReleaseYear, UserId};
+use chrono::{NaiveDate, NaiveDateTime, NaiveTime};
+
+fn make_movie() -> Movie {
+    Movie::new(
+        None,
+        MovieTitle::new("Test".into()).unwrap(),
+        ReleaseYear::new(2024).unwrap(),
+        None,
+        None,
+    )
+}
+
+fn dt(year: i32, month: u32, day: u32) -> NaiveDateTime {
+    NaiveDateTime::new(
+        NaiveDate::from_ymd_opt(year, month, day).unwrap(),
+        NaiveTime::from_hms_opt(12, 0, 0).unwrap(),
+    )
+}
+
+fn review_with_rating(movie_id: &MovieId, rating: u8, watched_at: NaiveDateTime) -> Review {
+    let user_id = UserId::generate();
+    Review::new(
+        movie_id.clone(),
+        user_id,
+        Rating::new(rating).unwrap(),
+        None,
+        watched_at,
+    )
+    .unwrap()
+}
+
+#[test]
+fn neutral_when_empty() {
+    let movie = make_movie();
+    let history = ReviewHistory::new(movie, vec![]);
+    let trend = ReviewHistoryAnalyzer::rating_trend(&history).unwrap();
+    assert_eq!(trend, Trend::Neutral);
+}
+
+#[test]
+fn neutral_when_single_review() {
+    let movie = make_movie();
+    let r = review_with_rating(movie.id(), 4, dt(2024, 1, 1));
+    let history = ReviewHistory::new(movie, vec![r]);
+    let trend = ReviewHistoryAnalyzer::rating_trend(&history).unwrap();
+    assert_eq!(trend, Trend::Neutral);
+}
+
+#[test]
+fn improved_when_latest_above_average() {
+    let movie = make_movie();
+    let viewings = vec![
+        review_with_rating(movie.id(), 2, dt(2024, 1, 1)),
+        review_with_rating(movie.id(), 3, dt(2024, 2, 1)),
+        review_with_rating(movie.id(), 5, dt(2024, 3, 1)),
+    ];
+    let history = ReviewHistory::new(movie, viewings);
+    let trend = ReviewHistoryAnalyzer::rating_trend(&history).unwrap();
+    assert_eq!(trend, Trend::Improved);
+}
+
+#[test]
+fn declined_when_latest_below_average() {
+    let movie = make_movie();
+    let viewings = vec![
+        review_with_rating(movie.id(), 5, dt(2024, 1, 1)),
+        review_with_rating(movie.id(), 4, dt(2024, 2, 1)),
+        review_with_rating(movie.id(), 2, dt(2024, 3, 1)),
+    ];
+    let history = ReviewHistory::new(movie, viewings);
+    let trend = ReviewHistoryAnalyzer::rating_trend(&history).unwrap();
+    assert_eq!(trend, Trend::Declined);
+}

crates/domain/src/tests/events.rs

@@ -0,0 +1,16 @@
+use super::*;
+use crate::value_objects::UserId;
+
+#[test]
+fn follow_accepted_matches() {
+    let uid = UserId::from_uuid(uuid::Uuid::new_v4());
+    let event = DomainEvent::FollowAccepted {
+        local_user_id: uid.clone(),
+        remote_actor_url: "https://remote.example/users/alice".to_string(),
+        outbox_url: "https://remote.example/users/alice/outbox".to_string(),
+    };
+    let DomainEvent::FollowAccepted { outbox_url, .. } = event else {
+        panic!("wrong variant");
+    };
+    assert_eq!(outbox_url, "https://remote.example/users/alice/outbox");
+}

crates/domain/src/tests/value_objects.rs

@@ -0,0 +1,141 @@
+use super::*;
+
+#[test]
+fn movie_id_generate_unique() {
+    let a = MovieId::generate();
+    let b = MovieId::generate();
+    assert_ne!(a, b);
+}
+
+#[test]
+fn rating_valid_range() {
+    assert!(Rating::new(0).is_ok());
+    assert!(Rating::new(5).is_ok());
+    assert_eq!(Rating::new(3).unwrap().value(), 3);
+}
+
+#[test]
+fn rating_invalid() {
+    assert!(Rating::new(6).is_err());
+    assert!(Rating::new(255).is_err());
+}
+
+#[test]
+fn movie_title_valid() {
+    let t = MovieTitle::new("Test".into());
+    assert!(t.is_ok());
+    assert_eq!(t.unwrap().value(), "Test");
+}
+
+#[test]
+fn movie_title_empty_rejected() {
+    assert!(MovieTitle::new("".into()).is_err());
+    assert!(MovieTitle::new("   ".into()).is_err());
+}
+
+#[test]
+fn release_year_valid() {
+    assert!(ReleaseYear::new(2024).is_ok());
+    assert_eq!(ReleaseYear::new(1888).unwrap().value(), 1888);
+}
+
+#[test]
+fn release_year_too_early() {
+    assert!(ReleaseYear::new(1887).is_err());
+}
+
+#[test]
+fn email_valid() {
+    let e = Email::new("a@b.com".into());
+    assert!(e.is_ok());
+    assert_eq!(e.unwrap().value(), "a@b.com");
+}
+
+#[test]
+fn email_invalid() {
+    assert!(Email::new("invalid".into()).is_err());
+    assert!(Email::new("".into()).is_err());
+}
+
+#[test]
+fn username_valid() {
+    let u = Username::new("test".into());
+    assert!(u.is_ok());
+    assert_eq!(u.unwrap().value(), "test");
+}
+
+#[test]
+fn username_lowercases() {
+    assert_eq!(Username::new("Alice".into()).unwrap().value(), "alice");
+}
+
+#[test]
+fn username_rejects_too_short() {
+    assert!(Username::new("a".into()).is_err());
+}
+
+#[test]
+fn username_rejects_special_chars() {
+    assert!(Username::new("no spaces".into()).is_err());
+    assert!(Username::new("no@at".into()).is_err());
+}
+
+#[test]
+fn poster_path_valid() {
+    let p = PosterPath::new("path/to/poster".into());
+    assert!(p.is_ok());
+    assert_eq!(p.unwrap().value(), "path/to/poster");
+}
+
+#[test]
+fn poster_path_empty_rejected() {
+    assert!(PosterPath::new("".into()).is_err());
+}
+
+#[test]
+fn comment_valid() {
+    let c = Comment::new("nice movie".into());
+    assert!(c.is_ok());
+    assert_eq!(c.unwrap().value(), "nice movie");
+}
+
+#[test]
+fn comment_empty_is_ok() {
+    // empty comment allowed — only max-length checked
+    assert!(Comment::new("".into()).is_ok());
+}
+
+#[test]
+fn external_metadata_id_valid() {
+    let e = ExternalMetadataId::new("tt1234567".into());
+    assert!(e.is_ok());
+    assert_eq!(e.unwrap().value(), "tt1234567");
+}
+
+#[test]
+fn external_metadata_id_empty_rejected() {
+    assert!(ExternalMetadataId::new("".into()).is_err());
+    assert!(ExternalMetadataId::new("   ".into()).is_err());
+}
+
+#[test]
+fn password_hash_valid() {
+    assert!(PasswordHash::new("hash".into()).is_ok());
+}
+
+#[test]
+fn password_hash_empty_rejected() {
+    assert!(PasswordHash::new("".into()).is_err());
+}
+
+#[test]
+fn poster_url_valid() {
+    let u = PosterUrl::new("https://img.com/poster.jpg".into());
+    assert!(u.is_ok());
+    assert_eq!(u.unwrap().value(), "https://img.com/poster.jpg");
+}
+
+#[test]
+fn poster_url_empty_rejected() {
+    assert!(PosterUrl::new("".into()).is_err());
+}

crates/domain/src/value_objects.rs

@@ -253,146 +253,6 @@ impl PosterUrl {
 }
 
 #[cfg(test)]
-mod tests {
+#[path = "tests/value_objects.rs"]
-    use super::*;
+mod tests;
 
-    #[test]
-    fn movie_id_generate_unique() {
-        let a = MovieId::generate();
-        let b = MovieId::generate();
-        assert_ne!(a, b);
-    }
-
-    #[test]
-    fn rating_valid_range() {
-        assert!(Rating::new(0).is_ok());
-        assert!(Rating::new(5).is_ok());
-        assert_eq!(Rating::new(3).unwrap().value(), 3);
-    }
-
-    #[test]
-    fn rating_invalid() {
-        assert!(Rating::new(6).is_err());
-        assert!(Rating::new(255).is_err());
-    }
-
-    #[test]
-    fn movie_title_valid() {
-        let t = MovieTitle::new("Test".into());
-        assert!(t.is_ok());
-        assert_eq!(t.unwrap().value(), "Test");
-    }
-
-    #[test]
-    fn movie_title_empty_rejected() {
-        assert!(MovieTitle::new("".into()).is_err());
-        assert!(MovieTitle::new("   ".into()).is_err());
-    }
-
-    #[test]
-    fn release_year_valid() {
-        assert!(ReleaseYear::new(2024).is_ok());
-        assert_eq!(ReleaseYear::new(1888).unwrap().value(), 1888);
-    }
-
-    #[test]
-    fn release_year_too_early() {
-        assert!(ReleaseYear::new(1887).is_err());
-    }
-
-    #[test]
-    fn email_valid() {
-        let e = Email::new("a@b.com".into());
-        assert!(e.is_ok());
-        assert_eq!(e.unwrap().value(), "a@b.com");
-    }
-
-    #[test]
-    fn email_invalid() {
-        assert!(Email::new("invalid".into()).is_err());
-        assert!(Email::new("".into()).is_err());
-    }
-
-    #[test]
-    fn username_valid() {
-        let u = Username::new("test".into());
-        assert!(u.is_ok());
-        assert_eq!(u.unwrap().value(), "test");
-    }
-
-    #[test]
-    fn username_lowercases() {
-        assert_eq!(Username::new("Alice".into()).unwrap().value(), "alice");
-    }
-
-    #[test]
-    fn username_rejects_too_short() {
-        assert!(Username::new("a".into()).is_err());
-    }
-
-    #[test]
-    fn username_rejects_special_chars() {
-        assert!(Username::new("no spaces".into()).is_err());
-        assert!(Username::new("no@at".into()).is_err());
-    }
-
-    #[test]
-    fn poster_path_valid() {
-        let p = PosterPath::new("path/to/poster".into());
-        assert!(p.is_ok());
-        assert_eq!(p.unwrap().value(), "path/to/poster");
-    }
-
-    #[test]
-    fn poster_path_empty_rejected() {
-        assert!(PosterPath::new("".into()).is_err());
-    }
-
-    #[test]
-    fn comment_valid() {
-        let c = Comment::new("nice movie".into());
-        assert!(c.is_ok());
-        assert_eq!(c.unwrap().value(), "nice movie");
-    }
-
-    #[test]
-    fn comment_empty_is_ok() {
-        // empty comment allowed — only max-length checked
-        assert!(Comment::new("".into()).is_ok());
-    }
-
-    #[test]
-    fn external_metadata_id_valid() {
-        let e = ExternalMetadataId::new("tt1234567".into());
-        assert!(e.is_ok());
-        assert_eq!(e.unwrap().value(), "tt1234567");
-    }
-
-    #[test]
-    fn external_metadata_id_empty_rejected() {
-        assert!(ExternalMetadataId::new("".into()).is_err());
-        assert!(ExternalMetadataId::new("   ".into()).is_err());
-    }
-
-    #[test]
-    fn password_hash_valid() {
-        assert!(PasswordHash::new("hash".into()).is_ok());
-    }
-
-    #[test]
-    fn password_hash_empty_rejected() {
-        assert!(PasswordHash::new("".into()).is_err());
-    }
-
-    #[test]
-    fn poster_url_valid() {
-        let u = PosterUrl::new("https://img.com/poster.jpg".into());
-        assert!(u.is_ok());
-        assert_eq!(u.unwrap().value(), "https://img.com/poster.jpg");
-    }
-
-    #[test]
-    fn poster_url_empty_rejected() {
-        assert!(PosterUrl::new("".into()).is_err());
-    }
-}