test(gpodder): implement full test suite

* these tests were partially generated using AI, and reviewed by me
* there are 4 failing tests related to subscription counts; this is
  known functionality that still needs to be implemented

gpodder_sqlite/src/repository/subscription.rs

@@ -372,3 +372,68 @@ impl gpodder::GpodderSubscriptionStore for SqliteRepository {
         .map_err(AuthErr::from)
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::SqliteRepository;
+
+    #[test]
+    fn test_set_subscriptions_for_device() {
+        let store = SqliteRepository::in_memory().unwrap();
+        gpodder_test::subscription::test_set_subscriptions_for_device(store);
+    }
+
+    #[test]
+    fn test_set_subscriptions_replaces() {
+        let store = SqliteRepository::in_memory().unwrap();
+        gpodder_test::subscription::test_set_subscriptions_replaces(store);
+    }
+
+    #[test]
+    fn test_update_subscriptions_add() {
+        let store = SqliteRepository::in_memory().unwrap();
+        gpodder_test::subscription::test_update_subscriptions_add(store);
+    }
+
+    #[test]
+    fn test_update_subscriptions_remove() {
+        let store = SqliteRepository::in_memory().unwrap();
+        gpodder_test::subscription::test_update_subscriptions_remove(store);
+    }
+
+    #[test]
+    fn test_update_subscriptions_add_and_remove() {
+        let store = SqliteRepository::in_memory().unwrap();
+        gpodder_test::subscription::test_update_subscriptions_add_and_remove(store);
+    }
+
+    #[test]
+    fn test_subscriptions_for_user() {
+        let store = SqliteRepository::in_memory().unwrap();
+        gpodder_test::subscription::test_subscriptions_for_user(store);
+    }
+
+    #[test]
+    fn test_subscription_updates_since() {
+        let store = SqliteRepository::in_memory().unwrap();
+        gpodder_test::subscription::test_subscription_updates_since(store);
+    }
+
+    #[test]
+    fn test_subscription_updates_add_and_remove() {
+        let store = SqliteRepository::in_memory().unwrap();
+        gpodder_test::subscription::test_subscription_updates_add_and_remove(store);
+    }
+
+    #[test]
+    fn test_subscription_propagation_in_sync_group() {
+        let store = SqliteRepository::in_memory().unwrap();
+        gpodder_test::subscription::test_subscription_propagation_in_sync_group(store);
+    }
+
+    #[test]
+    fn test_subscription_isolation_between_users() {
+        let store = SqliteRepository::in_memory().unwrap();
+        gpodder_test::subscription::test_subscription_isolation_between_users(store);
+    }
+}