import pytest

from app.core import redis_sync


def test_sync_redis_reuses_singleton(monkeypatch: pytest.MonkeyPatch) -> None:
    created: list[object] = []

    class FakeRedis:
        def close(self) -> None:
            pass

    def fake_from_url(*args, **kwargs):
        client = FakeRedis()
        created.append(client)
        return client

    redis_sync.reset_sync_redis_clients_for_tests()
    monkeypatch.setattr(redis_sync.redis, "from_url", fake_from_url)

    first = redis_sync.get_sync_redis(decode_responses=True)
    second = redis_sync.get_sync_redis(decode_responses=True)

    assert first is second
    assert len(created) == 1

    redis_sync.reset_sync_redis_clients_for_tests()