test: cascading in-memory store

crates/domain/src/testing/fakes/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())
+    }
+}