feat: atomic review writes with events

crates/adapters/sqlite/tests/repositories/review_repository_test.rs

@@ -0,0 +1,82 @@
+use std::str::FromStr;
+
+use domain::{
+    events::DomainEvent,
+    ports::{MovieCommand, ReviewRepository, UserRepository},
+    testing::{test_movie, test_review, test_user},
+};
+use sqlite::{SqliteMovieRepository, SqliteReviewRepository, SqliteUserRepository};
+use sqlx::{
+    SqlitePool,
+    sqlite::{SqliteConnectOptions, SqlitePoolOptions},
+};
+
+async fn migrated_pool() -> SqlitePool {
+    let opts = SqliteConnectOptions::from_str("sqlite::memory:").unwrap();
+    let pool = SqlitePoolOptions::new()
+        .max_connections(1)
+        .connect_with(opts)
+        .await
+        .unwrap();
+    sqlite::migrate(&pool).await.unwrap();
+    pool
+}
+
+async fn count(pool: &SqlitePool, table: &str) -> i64 {
+    sqlx::query_scalar(&format!("SELECT COUNT(*) FROM {table}"))
+        .fetch_one(pool)
+        .await
+        .unwrap()
+}
+
+fn logged(review: &domain::models::Review) -> DomainEvent {
+    DomainEvent::ReviewLogged {
+        review_id: review.id().clone(),
+        movie_id: review.movie_id().clone(),
+        user_id: review.user_id().clone(),
+        rating: review.rating().clone(),
+        watched_at: *review.watched_at(),
+    }
+}
+
+#[tokio::test]
+async fn saving_a_review_writes_the_review_and_its_event_in_one_commit() {
+    let pool = migrated_pool().await;
+    let movie = test_movie("Heat");
+    let user = test_user("alice");
+    SqliteUserRepository::new(pool.clone())
+        .save(&user)
+        .await
+        .unwrap();
+    SqliteMovieRepository::new(pool.clone())
+        .upsert_movie(&movie)
+        .await
+        .unwrap();
+    let review = test_review(movie.id(), user.id(), 4);
+
+    SqliteReviewRepository::new(pool.clone())
+        .save_review(&review, &[logged(&review)])
+        .await
+        .unwrap();
+
+    assert_eq!(count(&pool, "reviews").await, 1);
+    assert_eq!(count(&pool, "event_queue").await, 1);
+}
+
+#[tokio::test]
+async fn a_failed_review_save_leaves_no_event_row() {
+    let pool = migrated_pool().await;
+    let review = test_review(
+        &domain::value_objects::MovieId::generate(),
+        &domain::value_objects::UserId::generate(),
+        4,
+    );
+
+    let result = SqliteReviewRepository::new(pool.clone())
+        .save_review(&review, &[logged(&review)])
+        .await;
+
+    assert!(result.is_err(), "FK violation must fail the save");
+    assert_eq!(count(&pool, "reviews").await, 0);
+    assert_eq!(count(&pool, "event_queue").await, 0);
+}