insights-correlations (#22)

Reviewed-on: #22

crates/domain/src/testing/fakes.rs

@@ -103,9 +103,6 @@ impl FakeDiaryQuery {
             .insert(movie.id().value(), (movie, reviews));
     }
 
-    /// Configures what `query_diary` returns. Without this, `query_diary` keeps
-    /// its original always-empty behavior — this is purely opt-in for tests that
-    /// need to prove entries actually flow through a use case.
     pub fn set_diary_page(&self, page: Paginated<DiaryEntry>) {
         *self.diary_page.lock().unwrap() = Some(page);
     }

crates/domain/src/testing/in_memory.rs

@@ -347,9 +347,6 @@ impl WatchlistRepository for InMemoryWatchlistRepository {
 
 // ── InMemoryRemoteWatchlistRepository ─────────────────────────────────────────
 
-/// Unlike `NoopRemoteWatchlistRepository`, this actually stores what it's given —
-/// needed by tests that must prove a federated-watchlist read returns real seeded
-/// data, not just an empty default that happens to match by coincidence.
 pub struct InMemoryRemoteWatchlistRepository {
     store: Mutex<Vec<RemoteWatchlistEntry>>,
 }
@@ -405,10 +402,6 @@ impl RemoteWatchlistRepository for InMemoryRemoteWatchlistRepository {
         Ok(())
     }
 
-    /// Real adapters derive `uuid` from the actor URL via a SQL-side hash — not
-    /// domain logic, so this fake doesn't replicate it. It simply returns
-    /// everything seeded, which is all callers in this workspace need: tests seed
-    /// exactly the entries for the owner under test.
     async fn get_by_derived_uuid(
         &self,
         _uuid: Uuid,

crates/domain/src/testing/insights.rs

@@ -0,0 +1,52 @@
+use std::collections::HashMap;
+use std::sync::{Arc, Mutex};
+
+use async_trait::async_trait;
+
+use crate::{
+    errors::DomainError, models::insights::WatchRow, ports::InsightsQuery, value_objects::UserId,
+};
+
+// ── PanicInsightsQuery ──────────────────────────────────────────────────────
+
+pub struct PanicInsightsQuery;
+
+#[async_trait]
+impl InsightsQuery for PanicInsightsQuery {
+    async fn get_watch_rows(&self, _: &UserId) -> Result<Vec<WatchRow>, DomainError> {
+        panic!("PanicInsightsQuery called")
+    }
+}
+
+// ── InMemoryInsightsQuery ───────────────────────────────────────────────────
+
+pub struct InMemoryInsightsQuery {
+    pub rows_by_user: Mutex<HashMap<uuid::Uuid, Vec<WatchRow>>>,
+}
+
+impl InMemoryInsightsQuery {
+    pub fn new() -> Arc<Self> {
+        Arc::new(Self {
+            rows_by_user: Mutex::new(HashMap::new()),
+        })
+    }
+
+    pub fn with_rows(user_id: uuid::Uuid, rows: Vec<WatchRow>) -> Arc<Self> {
+        let query = Self::new();
+        query.rows_by_user.lock().unwrap().insert(user_id, rows);
+        query
+    }
+}
+
+#[async_trait]
+impl InsightsQuery for InMemoryInsightsQuery {
+    async fn get_watch_rows(&self, user_id: &UserId) -> Result<Vec<WatchRow>, DomainError> {
+        Ok(self
+            .rows_by_user
+            .lock()
+            .unwrap()
+            .get(&user_id.value())
+            .cloned()
+            .unwrap_or_default())
+    }
+}

crates/domain/src/testing/mod.rs

@@ -1,11 +1,13 @@
 mod fakes;
 mod in_memory;
+mod insights;
 mod noops;
 mod panics;
 mod wrapup;
 
 pub use fakes::*;
 pub use in_memory::*;
+pub use insights::*;
 pub use noops::*;
 pub use panics::*;
 pub use wrapup::*;