fix: ignore expired anime in random pool cache

integrations/jikan/client_test.go

@@ -86,6 +86,32 @@ func TestGetWithCacheAllowsEmptySearchResults(t *testing.T) {
 	}
 }
 
+func TestLoadCachedRandomPoolIgnoresExpiredAnimeCache(t *testing.T) {
+	sqlDB := newTestCacheDB(t)
+	defer func() {
+		if err := sqlDB.Close(); err != nil {
+			t.Errorf("close sqlite: %v", err)
+		}
+	}()
+
+	queries := db.New(sqlDB)
+	client := NewClient(config.Config{}, queries, observability.NewMetrics())
+	insertCachedAnime(t, sqlDB, "anime:1", Anime{MalID: 1, Title: "fresh"}, time.Now().Add(time.Hour))
+	insertCachedAnime(t, sqlDB, "anime:2", Anime{MalID: 2, Title: "expired"}, time.Now().Add(-time.Hour))
+
+	client.loadCachedRandomPool(context.Background())
+
+	client.poolMu.RLock()
+	defer client.poolMu.RUnlock()
+
+	if len(client.randomPool) != 1 {
+		t.Fatalf("randomPool length = %d, want 1", len(client.randomPool))
+	}
+	if client.randomPool[0].MalID != 1 || client.randomPool[0].Title != "fresh" {
+		t.Fatalf("randomPool[0] = %+v, want fresh anime", client.randomPool[0])
+	}
+}
+
 func newTestCacheDB(t *testing.T) *sql.DB {
 	t.Helper()
 	ctx := context.Background()
@@ -135,6 +161,27 @@ func insertCachedResponse(t *testing.T, sqlDB *sql.DB, key string, value TopAnim
 	}
 }
 
+func insertCachedAnime(t *testing.T, sqlDB *sql.DB, key string, value Anime, expiresAt time.Time) {
+	t.Helper()
+	ctx := context.Background()
+
+	encoded, err := json.Marshal(value)
+	if err != nil {
+		t.Fatalf("marshal cached anime: %v", err)
+	}
+
+	_, err = sqlDB.ExecContext(
+		ctx,
+		`INSERT INTO jikan_cache (key, data, expires_at) VALUES (?, ?, ?)`,
+		key,
+		string(encoded),
+		expiresAt,
+	)
+	if err != nil {
+		t.Fatalf("insert cached anime: %v", err)
+	}
+}
+
 func waitForFreshCache(t *testing.T, sqlDB *sql.DB, client *Client, key string) {
 	t.Helper()