huskies: merge 1111 bug Test isolation: init_for_test() and ensure_content_store() are once-per-thread, not once-per-test, polluting CRDT state across tests

server/src/db/content_store.rs

@@ -165,7 +165,9 @@ pub fn delete_content(key: ContentKey<'_>) {
 
 /// Ensure the in-memory content store is initialised.
 ///
-/// Safe to call multiple times — the `OnceLock` is set at most once.
+/// In non-test builds: init-once via `OnceLock` (safe to call multiple times).
+/// In test builds: always resets `CONTENT_STORE_TL` to an empty `HashMap` so
+/// each test on the same thread starts with a clean store.
 pub fn ensure_content_store() {
     #[cfg(not(test))]
     {
@@ -175,7 +177,11 @@ pub fn ensure_content_store() {
     #[cfg(test)]
     {
         CONTENT_STORE_TL.with(|lock| {
-            if lock.get().is_none() {
+            if let Some(mutex) = lock.get() {
+                // Already initialised on this thread — reset to empty so the
+                // next test does not see content written by a previous test.
+                mutex.lock().unwrap().clear();
+            } else {
                 let _ = lock.set(Mutex::new(HashMap::new()));
             }
         });
@@ -203,6 +209,41 @@ pub(super) fn init_content_store(map: HashMap<String, String>) {
 mod tests {
     use super::*;
 
+    /// Regression: two sequential `ensure_content_store()` + write + read cycles
+    /// in the same test body must not see each other's content.  Before the fix,
+    /// `ensure_content_store()` was a no-op on the second call (OnceLock gating),
+    /// so the second cycle could read items written in the first cycle.
+    #[test]
+    fn sequential_ensure_content_store_resets_state() {
+        // ── Cycle 1 ──────────────────────────────────────────────────────────
+        ensure_content_store();
+        write_content(ContentKey::Story("1111_cycle1"), "cycle-one body");
+        assert_eq!(
+            read_content(ContentKey::Story("1111_cycle1")).as_deref(),
+            Some("cycle-one body"),
+            "cycle 1: item must be readable after write"
+        );
+
+        // ── Cycle 2: reset, write a different item ────────────────────────────
+        ensure_content_store();
+        // Cycle-1 item must no longer be visible.
+        assert!(
+            read_content(ContentKey::Story("1111_cycle1")).is_none(),
+            "cycle 2: store must be empty; cycle-1 content must not bleed through"
+        );
+        write_content(ContentKey::Story("1111_cycle2"), "cycle-two body");
+        assert_eq!(
+            read_content(ContentKey::Story("1111_cycle2")).as_deref(),
+            Some("cycle-two body"),
+            "cycle 2: own item must be readable"
+        );
+        // And cycle-1 key must still be absent.
+        assert!(
+            read_content(ContentKey::Story("1111_cycle1")).is_none(),
+            "cycle 2: cycle-1 content must remain absent after cycle-2 write"
+        );
+    }
+
     /// AC 2 regression: writing under `ContentKey::Story` is not visible under
     /// `ContentKey::GateOutput` (and vice versa).  The typed key namespace, not
     /// runtime substring matching, enforces the separation.