add 400+ unit tests for domain and application layers

Extract ReviewLogger trait to decouple import/integrations
from diary::log_review (cross-module coupling smell).

Add in-memory fakes for all repository ports, enabling
isolated testing of every use case module without a database.

Coverage: domain+application 22% → 80%, 427 tests.

crates/application/src/users/get_current_profile.rs

@@ -57,3 +57,7 @@ pub async fn execute(
         role: user.role().as_str().into(),
     })
 }
+
+#[cfg(test)]
+#[path = "tests/get_current_profile.rs"]
+mod tests;

crates/application/src/users/get_profile.rs

@@ -183,3 +183,139 @@ fn format_year_month_long(ym: &str) -> String {
     };
     format!("{} {}", month, parts[0])
 }
+
+#[cfg(test)]
+#[path = "tests/get_profile.rs"]
+mod tests;
+
+#[cfg(test)]
+mod helper_tests {
+    use super::*;
+
+    #[test]
+    fn format_year_month_long_all_months() {
+        assert_eq!(format_year_month_long("2024-01"), "January 2024");
+        assert_eq!(format_year_month_long("2024-02"), "February 2024");
+        assert_eq!(format_year_month_long("2024-03"), "March 2024");
+        assert_eq!(format_year_month_long("2024-04"), "April 2024");
+        assert_eq!(format_year_month_long("2024-05"), "May 2024");
+        assert_eq!(format_year_month_long("2024-06"), "June 2024");
+        assert_eq!(format_year_month_long("2024-07"), "July 2024");
+        assert_eq!(format_year_month_long("2024-08"), "August 2024");
+        assert_eq!(format_year_month_long("2024-09"), "September 2024");
+        assert_eq!(format_year_month_long("2024-10"), "October 2024");
+        assert_eq!(format_year_month_long("2024-11"), "November 2024");
+        assert_eq!(format_year_month_long("2024-12"), "December 2024");
+    }
+
+    #[test]
+    fn format_year_month_long_invalid() {
+        assert_eq!(format_year_month_long("invalid"), "invalid");
+        assert_eq!(format_year_month_long("2024-99"), "99 2024");
+    }
+
+    #[test]
+    fn feed_sort_to_direction_all_variants() {
+        use domain::ports::FeedSortBy;
+        assert!(matches!(
+            feed_sort_to_direction(FeedSortBy::Date),
+            SortDirection::Descending
+        ));
+        assert!(matches!(
+            feed_sort_to_direction(FeedSortBy::DateAsc),
+            SortDirection::Ascending
+        ));
+        assert!(matches!(
+            feed_sort_to_direction(FeedSortBy::Rating),
+            SortDirection::ByRatingDesc
+        ));
+        assert!(matches!(
+            feed_sort_to_direction(FeedSortBy::RatingAsc),
+            SortDirection::ByRatingAsc
+        ));
+    }
+
+    #[test]
+    fn group_by_month_empty() {
+        assert!(group_by_month(vec![]).is_empty());
+    }
+
+    #[test]
+    fn group_by_month_groups_entries() {
+        use chrono::NaiveDateTime;
+        use domain::models::{Movie, Review};
+        use domain::value_objects::{MovieId, MovieTitle, Rating, ReleaseYear, UserId};
+
+        let movie = Movie::from_persistence(
+            MovieId::generate(),
+            None,
+            MovieTitle::new("Test".into()).unwrap(),
+            ReleaseYear::new(2024).unwrap(),
+            None,
+            None,
+        );
+        let uid = UserId::from_uuid(uuid::Uuid::new_v4());
+
+        let jan =
+            NaiveDateTime::parse_from_str("2024-01-15 10:00:00", "%Y-%m-%d %H:%M:%S").unwrap();
+        let jan2 =
+            NaiveDateTime::parse_from_str("2024-01-20 10:00:00", "%Y-%m-%d %H:%M:%S").unwrap();
+        let mar =
+            NaiveDateTime::parse_from_str("2024-03-05 10:00:00", "%Y-%m-%d %H:%M:%S").unwrap();
+
+        let r1 = Review::new(
+            movie.id().clone(),
+            uid.clone(),
+            Rating::new(4).unwrap(),
+            None,
+            jan,
+        )
+        .unwrap();
+        let r2 = Review::new(
+            movie.id().clone(),
+            uid.clone(),
+            Rating::new(3).unwrap(),
+            None,
+            jan2,
+        )
+        .unwrap();
+        let r3 = Review::new(
+            movie.id().clone(),
+            uid.clone(),
+            Rating::new(5).unwrap(),
+            None,
+            mar,
+        )
+        .unwrap();
+
+        let entries = vec![
+            DiaryEntry::new(movie.clone(), r1),
+            DiaryEntry::new(movie.clone(), r2),
+            DiaryEntry::new(movie.clone(), r3),
+        ];
+
+        let result = group_by_month(entries);
+        // Reversed: March first, then January
+        assert_eq!(result.len(), 2);
+        assert_eq!(result[0].month_label, "March 2024");
+        assert_eq!(result[0].count, 1);
+        assert_eq!(result[1].month_label, "January 2024");
+        assert_eq!(result[1].count, 2);
+    }
+
+    #[test]
+    fn paged_user_filter_builds_correctly() {
+        let uid = UserId::from_uuid(uuid::Uuid::new_v4());
+        let filter = paged_user_filter(
+            uid.clone(),
+            SortDirection::Descending,
+            Some(20),
+            Some(5),
+            Some("blade".into()),
+        )
+        .unwrap();
+
+        assert_eq!(filter.user_id.unwrap().value(), uid.value());
+        assert_eq!(filter.search.as_deref(), Some("blade"));
+    }
+}

crates/application/src/users/get_settings.rs

@@ -6,3 +6,7 @@ pub async fn execute(ctx: &AppContext, user_id: uuid::Uuid) -> Result<UserSettin
     let uid = UserId::from_uuid(user_id);
     ctx.repos.user_settings.get(&uid).await
 }
+
+#[cfg(test)]
+#[path = "tests/get_settings.rs"]
+mod tests;

crates/application/src/users/get_users.rs

@@ -20,3 +20,7 @@ pub async fn execute(
         remote_actors: actors_result?,
     })
 }
+
+#[cfg(test)]
+#[path = "tests/get_users.rs"]
+mod tests;

crates/application/src/users/tests/get_current_profile.rs

@@ -0,0 +1,115 @@
+use std::sync::Arc;
+
+use domain::models::{ProfileField, User, UserProfile, UserRole};
+use domain::ports::UserRepository;
+use domain::testing::InMemoryUserRepository;
+use domain::value_objects::{Email, PasswordHash, UserId, Username};
+use uuid::Uuid;
+
+use crate::{
+    auth::{commands::RegisterCommand, register},
+    test_helpers::TestContextBuilder,
+    users::{get_current_profile, queries::GetCurrentProfileQuery},
+};
+
+#[tokio::test]
+async fn returns_profile_for_existing_user() {
+    let users = InMemoryUserRepository::new();
+    let ctx = TestContextBuilder::new()
+        .with_users(Arc::clone(&users) as _)
+        .build();
+
+    register::execute(
+        &ctx,
+        RegisterCommand {
+            email: "alice@example.com".into(),
+            username: "alice".into(),
+            password: "password123".into(),
+            role: UserRole::Standard,
+        },
+    )
+    .await
+    .unwrap();
+
+    let user = users
+        .find_by_email(&domain::value_objects::Email::new("alice@example.com".into()).unwrap())
+        .await
+        .unwrap()
+        .unwrap();
+
+    let profile = get_current_profile::execute(
+        &ctx,
+        GetCurrentProfileQuery {
+            user_id: user.id().value(),
+        },
+    )
+    .await
+    .unwrap();
+
+    assert_eq!(profile.username, "alice");
+}
+
+#[tokio::test]
+async fn fails_for_nonexistent_user() {
+    let ctx = TestContextBuilder::new().build();
+
+    let result = get_current_profile::execute(
+        &ctx,
+        GetCurrentProfileQuery {
+            user_id: Uuid::new_v4(),
+        },
+    )
+    .await;
+
+    assert!(result.is_err());
+}
+
+#[tokio::test]
+async fn returns_profile_with_avatar_banner_and_fields() {
+    let users = InMemoryUserRepository::new();
+    let uid = UserId::generate();
+
+    let user = User::from_persistence(
+        uid.clone(),
+        Email::new("full@example.com".into()).unwrap(),
+        Username::new("fulluser".into()).unwrap(),
+        PasswordHash::new("hashed".into()).unwrap(),
+        UserRole::Standard,
+        UserProfile {
+            display_name: Some("Full Name".into()),
+            bio: Some("My bio".into()),
+            avatar_path: Some("avatars/abc123".into()),
+            banner_path: Some("banners/def456".into()),
+            also_known_as: None,
+            profile_fields: vec![ProfileField {
+                name: "Website".into(),
+                value: "https://example.com".into(),
+            }],
+        },
+    );
+    users.store.lock().unwrap().insert(uid.value(), user);
+
+    let ctx = TestContextBuilder::new()
+        .with_users(Arc::clone(&users) as _)
+        .build();
+
+    let profile = get_current_profile::execute(
+        &ctx,
+        GetCurrentProfileQuery {
+            user_id: uid.value(),
+        },
+    )
+    .await
+    .unwrap();
+
+    assert_eq!(profile.username, "fulluser");
+    assert_eq!(profile.display_name.as_deref(), Some("Full Name"));
+    assert_eq!(profile.bio.as_deref(), Some("My bio"));
+    assert!(profile.avatar_url.is_some());
+    assert!(profile.avatar_url.unwrap().contains("avatars/abc123"));
+    assert!(profile.banner_url.is_some());
+    assert!(profile.banner_url.unwrap().contains("banners/def456"));
+    assert_eq!(profile.fields.len(), 1);
+    assert_eq!(profile.fields[0].name, "Website");
+    assert_eq!(profile.fields[0].value, "https://example.com");
+}

crates/application/src/users/tests/get_profile.rs

@@ -0,0 +1,240 @@
+use domain::models::UserRole;
+use domain::value_objects::Email;
+
+use crate::auth::commands::RegisterCommand;
+use crate::auth::register;
+use crate::test_helpers::TestContextBuilder;
+use crate::users::get_profile;
+use crate::users::queries::{GetUserProfileQuery, ProfileView};
+
+#[tokio::test]
+async fn returns_profile_with_empty_stats() {
+    let ctx = TestContextBuilder::new().build();
+
+    register::execute(
+        &ctx,
+        RegisterCommand {
+            email: "profile@test.com".into(),
+            username: "profuser".into(),
+            password: "password123".into(),
+            role: UserRole::Standard,
+        },
+    )
+    .await
+    .unwrap();
+
+    let email = Email::new("profile@test.com".into()).unwrap();
+    let user = ctx.repos.user.find_by_email(&email).await.unwrap().unwrap();
+    let uid = user.id().value();
+
+    let result = get_profile::execute(
+        &ctx,
+        GetUserProfileQuery {
+            user_id: uid,
+            view: ProfileView::Recent,
+            limit: None,
+            offset: None,
+            sort_by: domain::ports::FeedSortBy::Date,
+            search: None,
+            is_own_profile: true,
+        },
+    )
+    .await
+    .unwrap();
+
+    assert!(result.entries.is_some());
+}
+
+#[tokio::test]
+async fn returns_history_view() {
+    let ctx = TestContextBuilder::new().build();
+
+    register::execute(
+        &ctx,
+        RegisterCommand {
+            email: "hist@test.com".into(),
+            username: "histuser".into(),
+            password: "password123".into(),
+            role: UserRole::Standard,
+        },
+    )
+    .await
+    .unwrap();
+
+    let email = Email::new("hist@test.com".into()).unwrap();
+    let user = ctx.repos.user.find_by_email(&email).await.unwrap().unwrap();
+    let uid = user.id().value();
+
+    let result = get_profile::execute(
+        &ctx,
+        GetUserProfileQuery {
+            user_id: uid,
+            view: ProfileView::History,
+            limit: None,
+            offset: None,
+            sort_by: domain::ports::FeedSortBy::Date,
+            search: None,
+            is_own_profile: true,
+        },
+    )
+    .await
+    .unwrap();
+
+    assert!(result.history.is_some());
+    assert!(result.entries.is_none());
+    assert!(result.trends.is_none());
+}
+
+#[tokio::test]
+async fn returns_trends_view() {
+    let ctx = TestContextBuilder::new().build();
+
+    register::execute(
+        &ctx,
+        RegisterCommand {
+            email: "trends@test.com".into(),
+            username: "trendsuser".into(),
+            password: "password123".into(),
+            role: UserRole::Standard,
+        },
+    )
+    .await
+    .unwrap();
+
+    let email = Email::new("trends@test.com".into()).unwrap();
+    let user = ctx.repos.user.find_by_email(&email).await.unwrap().unwrap();
+    let uid = user.id().value();
+
+    let result = get_profile::execute(
+        &ctx,
+        GetUserProfileQuery {
+            user_id: uid,
+            view: ProfileView::Trends,
+            limit: None,
+            offset: None,
+            sort_by: domain::ports::FeedSortBy::Date,
+            search: None,
+            is_own_profile: true,
+        },
+    )
+    .await
+    .unwrap();
+
+    assert!(result.trends.is_some());
+    assert!(result.entries.is_none());
+    assert!(result.history.is_none());
+}
+
+#[tokio::test]
+async fn returns_ratings_view() {
+    let ctx = TestContextBuilder::new().build();
+
+    register::execute(
+        &ctx,
+        RegisterCommand {
+            email: "ratings@test.com".into(),
+            username: "ratingsuser".into(),
+            password: "password123".into(),
+            role: UserRole::Standard,
+        },
+    )
+    .await
+    .unwrap();
+
+    let email = Email::new("ratings@test.com".into()).unwrap();
+    let user = ctx.repos.user.find_by_email(&email).await.unwrap().unwrap();
+    let uid = user.id().value();
+
+    let result = get_profile::execute(
+        &ctx,
+        GetUserProfileQuery {
+            user_id: uid,
+            view: ProfileView::Ratings,
+            limit: None,
+            offset: None,
+            sort_by: domain::ports::FeedSortBy::Rating,
+            search: None,
+            is_own_profile: true,
+        },
+    )
+    .await
+    .unwrap();
+
+    assert!(result.entries.is_some());
+}
+
+#[tokio::test]
+async fn returns_recent_with_search() {
+    let ctx = TestContextBuilder::new().build();
+
+    register::execute(
+        &ctx,
+        RegisterCommand {
+            email: "search@test.com".into(),
+            username: "searchuser".into(),
+            password: "password123".into(),
+            role: UserRole::Standard,
+        },
+    )
+    .await
+    .unwrap();
+
+    let email = Email::new("search@test.com".into()).unwrap();
+    let user = ctx.repos.user.find_by_email(&email).await.unwrap().unwrap();
+    let uid = user.id().value();
+
+    let result = get_profile::execute(
+        &ctx,
+        GetUserProfileQuery {
+            user_id: uid,
+            view: ProfileView::Recent,
+            limit: Some(10),
+            offset: Some(0),
+            sort_by: domain::ports::FeedSortBy::Date,
+            search: Some("blade".into()),
+            is_own_profile: true,
+        },
+    )
+    .await
+    .unwrap();
+
+    assert!(result.entries.is_some());
+}
+
+#[tokio::test]
+async fn non_own_profile_skips_pending_followers() {
+    let ctx = TestContextBuilder::new().build();
+
+    register::execute(
+        &ctx,
+        RegisterCommand {
+            email: "other@test.com".into(),
+            username: "otheruser".into(),
+            password: "password123".into(),
+            role: UserRole::Standard,
+        },
+    )
+    .await
+    .unwrap();
+
+    let email = Email::new("other@test.com".into()).unwrap();
+    let user = ctx.repos.user.find_by_email(&email).await.unwrap().unwrap();
+    let uid = user.id().value();
+
+    let result = get_profile::execute(
+        &ctx,
+        GetUserProfileQuery {
+            user_id: uid,
+            view: ProfileView::Recent,
+            limit: None,
+            offset: None,
+            sort_by: domain::ports::FeedSortBy::Date,
+            search: None,
+            is_own_profile: false,
+        },
+    )
+    .await
+    .unwrap();
+
+    assert!(result.pending_followers.is_empty());
+}

crates/application/src/users/tests/get_settings.rs

@@ -0,0 +1,12 @@
+use uuid::Uuid;
+
+use crate::{test_helpers::TestContextBuilder, users::get_settings};
+
+#[tokio::test]
+async fn returns_default_settings() {
+    let ctx = TestContextBuilder::new().build();
+
+    let settings = get_settings::execute(&ctx, Uuid::nil()).await.unwrap();
+
+    assert!(!settings.federate_goals());
+}

crates/application/src/users/tests/get_users.rs

@@ -0,0 +1,13 @@
+use crate::test_helpers::TestContextBuilder;
+use crate::users::get_users;
+use crate::users::queries::GetUsersQuery;
+
+#[tokio::test]
+async fn returns_empty_when_no_users() {
+    let ctx = TestContextBuilder::new().build();
+
+    let result = get_users::execute(&ctx, GetUsersQuery).await.unwrap();
+
+    assert!(result.users.is_empty());
+    assert!(result.remote_actors.is_empty());
+}

crates/application/src/users/tests/update_profile.rs

@@ -0,0 +1,269 @@
+use std::sync::Arc;
+
+use domain::events::DomainEvent;
+use domain::models::UserRole;
+use domain::ports::UserRepository;
+use domain::testing::{InMemoryUserRepository, NoopEventPublisher};
+use uuid::Uuid;
+
+use crate::{
+    auth::{commands::RegisterCommand, register},
+    test_helpers::TestContextBuilder,
+    users::{commands::UpdateProfileCommand, update_profile},
+};
+
+async fn register_user(
+    ctx: &crate::context::AppContext,
+    users: &Arc<InMemoryUserRepository>,
+) -> Uuid {
+    register::execute(
+        ctx,
+        RegisterCommand {
+            email: "alice@example.com".into(),
+            username: "alice".into(),
+            password: "password123".into(),
+            role: UserRole::Standard,
+        },
+    )
+    .await
+    .unwrap();
+
+    let user = users
+        .find_by_email(&domain::value_objects::Email::new("alice@example.com".into()).unwrap())
+        .await
+        .unwrap()
+        .unwrap();
+    user.id().value()
+}
+
+#[tokio::test]
+async fn updates_display_name() {
+    let users = InMemoryUserRepository::new();
+    let events = NoopEventPublisher::new();
+    let ctx = TestContextBuilder::new()
+        .with_users(Arc::clone(&users) as _)
+        .with_event_publisher(Arc::clone(&events) as _)
+        .build();
+
+    let uid = register_user(&ctx, &users).await;
+
+    update_profile::execute(
+        &ctx,
+        UpdateProfileCommand {
+            user_id: uid,
+            display_name: Some("Alice W.".into()),
+            bio: None,
+            avatar_bytes: None,
+            avatar_content_type: None,
+            banner_bytes: None,
+            banner_content_type: None,
+            also_known_as: None,
+        },
+    )
+    .await
+    .unwrap();
+
+    let published = events.published();
+    assert!(
+        published
+            .iter()
+            .any(|e| matches!(e, DomainEvent::UserUpdated { .. }))
+    );
+}
+
+#[tokio::test]
+async fn rejects_invalid_avatar_content_type() {
+    let users = InMemoryUserRepository::new();
+    let ctx = TestContextBuilder::new()
+        .with_users(Arc::clone(&users) as _)
+        .build();
+
+    let uid = register_user(&ctx, &users).await;
+
+    let result = update_profile::execute(
+        &ctx,
+        UpdateProfileCommand {
+            user_id: uid,
+            display_name: None,
+            bio: None,
+            avatar_bytes: Some(vec![0u8; 10]),
+            avatar_content_type: Some("image/gif".into()),
+            banner_bytes: None,
+            banner_content_type: None,
+            also_known_as: None,
+        },
+    )
+    .await;
+
+    assert!(result.is_err());
+}
+
+#[tokio::test]
+async fn uploads_avatar() {
+    let users = InMemoryUserRepository::new();
+    let events = NoopEventPublisher::new();
+    let ctx = TestContextBuilder::new()
+        .with_users(Arc::clone(&users) as _)
+        .with_event_publisher(Arc::clone(&events) as _)
+        .build();
+
+    let uid = register_user(&ctx, &users).await;
+
+    update_profile::execute(
+        &ctx,
+        UpdateProfileCommand {
+            user_id: uid,
+            display_name: None,
+            bio: None,
+            avatar_bytes: Some(vec![0xFFu8, 0xD8, 0xFF]),
+            avatar_content_type: Some("image/jpeg".into()),
+            banner_bytes: None,
+            banner_content_type: None,
+            also_known_as: None,
+        },
+    )
+    .await
+    .unwrap();
+
+    let published = events.published();
+    assert!(
+        published
+            .iter()
+            .any(|e| matches!(e, DomainEvent::UserUpdated { .. }))
+    );
+    assert!(
+        published
+            .iter()
+            .any(|e| matches!(e, DomainEvent::ImageStored { .. }))
+    );
+}
+
+#[tokio::test]
+async fn uploads_banner() {
+    let users = InMemoryUserRepository::new();
+    let events = NoopEventPublisher::new();
+    let ctx = TestContextBuilder::new()
+        .with_users(Arc::clone(&users) as _)
+        .with_event_publisher(Arc::clone(&events) as _)
+        .build();
+
+    let uid = register_user(&ctx, &users).await;
+
+    update_profile::execute(
+        &ctx,
+        UpdateProfileCommand {
+            user_id: uid,
+            display_name: None,
+            bio: None,
+            avatar_bytes: None,
+            avatar_content_type: None,
+            banner_bytes: Some(vec![0x89, 0x50, 0x4E]),
+            banner_content_type: Some("image/png".into()),
+            also_known_as: None,
+        },
+    )
+    .await
+    .unwrap();
+
+    let published = events.published();
+    assert!(
+        published
+            .iter()
+            .any(|e| matches!(e, DomainEvent::UserUpdated { .. }))
+    );
+    assert!(
+        published
+            .iter()
+            .any(|e| matches!(e, DomainEvent::ImageStored { .. }))
+    );
+}
+
+#[tokio::test]
+async fn fails_for_nonexistent_user() {
+    let ctx = TestContextBuilder::new().build();
+
+    let result = update_profile::execute(
+        &ctx,
+        UpdateProfileCommand {
+            user_id: Uuid::new_v4(),
+            display_name: Some("Ghost".into()),
+            bio: None,
+            avatar_bytes: None,
+            avatar_content_type: None,
+            banner_bytes: None,
+            banner_content_type: None,
+            also_known_as: None,
+        },
+    )
+    .await;
+
+    assert!(result.is_err());
+}
+
+#[tokio::test]
+async fn rejects_invalid_banner_content_type() {
+    let users = InMemoryUserRepository::new();
+    let ctx = TestContextBuilder::new()
+        .with_users(Arc::clone(&users) as _)
+        .build();
+
+    let uid = register_user(&ctx, &users).await;
+
+    let result = update_profile::execute(
+        &ctx,
+        UpdateProfileCommand {
+            user_id: uid,
+            display_name: None,
+            bio: None,
+            avatar_bytes: None,
+            avatar_content_type: None,
+            banner_bytes: Some(vec![0u8; 10]),
+            banner_content_type: Some("text/plain".into()),
+            also_known_as: None,
+        },
+    )
+    .await;
+
+    assert!(result.is_err());
+}
+
+#[tokio::test]
+async fn text_only_update_emits_user_updated_no_image_stored() {
+    let users = InMemoryUserRepository::new();
+    let events = NoopEventPublisher::new();
+    let ctx = TestContextBuilder::new()
+        .with_users(Arc::clone(&users) as _)
+        .with_event_publisher(Arc::clone(&events) as _)
+        .build();
+
+    let uid = register_user(&ctx, &users).await;
+
+    update_profile::execute(
+        &ctx,
+        UpdateProfileCommand {
+            user_id: uid,
+            display_name: Some("Alice Updated".into()),
+            bio: Some("Hello world".into()),
+            avatar_bytes: None,
+            avatar_content_type: None,
+            banner_bytes: None,
+            banner_content_type: None,
+            also_known_as: None,
+        },
+    )
+    .await
+    .unwrap();
+
+    let published = events.published();
+    assert!(
+        published
+            .iter()
+            .any(|e| matches!(e, DomainEvent::UserUpdated { .. }))
+    );
+    assert!(
+        !published
+            .iter()
+            .any(|e| matches!(e, DomainEvent::ImageStored { .. })),
+        "text-only update should not emit ImageStored"
+    );
+}

crates/application/src/users/tests/update_profile_fields.rs

@@ -0,0 +1,70 @@
+use std::sync::Arc;
+
+use domain::events::DomainEvent;
+use domain::models::ProfileField;
+use domain::testing::{InMemoryProfileFieldsRepo, NoopEventPublisher};
+use uuid::Uuid;
+
+use crate::{
+    test_helpers::TestContextBuilder,
+    users::{commands::UpdateProfileFieldsCommand, update_profile_fields},
+};
+
+#[tokio::test]
+async fn saves_profile_fields() {
+    let fields_repo = InMemoryProfileFieldsRepo::new();
+    let events = NoopEventPublisher::new();
+    let ctx = TestContextBuilder::new()
+        .with_profile_fields(Arc::clone(&fields_repo) as _)
+        .with_event_publisher(Arc::clone(&events) as _)
+        .build();
+
+    update_profile_fields::execute(
+        &ctx,
+        UpdateProfileFieldsCommand {
+            user_id: Uuid::nil(),
+            fields: vec![
+                ProfileField {
+                    name: "Website".into(),
+                    value: "https://example.com".into(),
+                },
+                ProfileField {
+                    name: "Location".into(),
+                    value: "Berlin".into(),
+                },
+            ],
+        },
+    )
+    .await
+    .unwrap();
+
+    let published = events.published();
+    assert!(
+        published
+            .iter()
+            .any(|e| matches!(e, DomainEvent::UserUpdated { .. }))
+    );
+}
+
+#[tokio::test]
+async fn rejects_more_than_four_fields() {
+    let ctx = TestContextBuilder::new().build();
+
+    let fields: Vec<ProfileField> = (0..5)
+        .map(|i| ProfileField {
+            name: format!("field{i}"),
+            value: format!("val{i}"),
+        })
+        .collect();
+
+    let result = update_profile_fields::execute(
+        &ctx,
+        UpdateProfileFieldsCommand {
+            user_id: Uuid::nil(),
+            fields,
+        },
+    )
+    .await;
+
+    assert!(result.is_err());
+}

crates/application/src/users/tests/update_settings.rs

@@ -0,0 +1,32 @@
+use std::sync::Arc;
+
+use domain::testing::InMemoryUserSettingsRepository;
+use uuid::Uuid;
+
+use crate::{
+    test_helpers::TestContextBuilder,
+    users::{get_settings, update_settings::UpdateUserSettingsCommand},
+};
+
+#[tokio::test]
+async fn updates_federate_goals() {
+    let settings_repo = InMemoryUserSettingsRepository::new();
+    let ctx = TestContextBuilder::new()
+        .with_user_settings(Arc::clone(&settings_repo) as _)
+        .build();
+
+    let uid = Uuid::nil();
+
+    crate::users::update_settings::execute(
+        &ctx,
+        UpdateUserSettingsCommand {
+            user_id: uid,
+            federate_goals: true,
+        },
+    )
+    .await
+    .unwrap();
+
+    let settings = get_settings::execute(&ctx, uid).await.unwrap();
+    assert!(settings.federate_goals());
+}

crates/application/src/users/update_profile.rs

@@ -90,3 +90,7 @@ pub async fn execute(ctx: &AppContext, cmd: UpdateProfileCommand) -> Result<(),
 
     Ok(())
 }
+
+#[cfg(test)]
+#[path = "tests/update_profile.rs"]
+mod tests;

crates/application/src/users/update_profile_fields.rs

@@ -19,3 +19,7 @@ pub async fn execute(ctx: &AppContext, cmd: UpdateProfileFieldsCommand) -> Resul
         .await?;
     Ok(())
 }
+
+#[cfg(test)]
+#[path = "tests/update_profile_fields.rs"]
+mod tests;

crates/application/src/users/update_settings.rs

@@ -13,3 +13,7 @@ pub async fn execute(ctx: &AppContext, cmd: UpdateUserSettingsCommand) -> Result
     settings.set_federate_goals(cmd.federate_goals);
     ctx.repos.user_settings.save(&settings).await
 }
+
+#[cfg(test)]
+#[path = "tests/update_settings.rs"]
+mod tests;