Add caching test for get_guild_prefix

tests/test_settings_manager.py

@@ -0,0 +1,77 @@
+import os
+import sys
+import asyncio
+from unittest.mock import AsyncMock, MagicMock
+import pytest
+
+# Ensure the project root is on sys.path so we can import modules
+sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from settings_manager import get_guild_prefix, _get_redis_key
+
+
+class DummyAcquire:
+    def __init__(self, conn, pool):
+        self._conn = conn
+        self._pool = pool
+
+    async def __aenter__(self):
+        self._pool.acquire_enter_called += 1
+        return self._conn
+
+    async def __aexit__(self, exc_type, exc, tb):
+        pass
+
+
+class DummyPool:
+    def __init__(self, conn):
+        self._conn = conn
+        self.acquire_enter_called = 0
+
+    def acquire(self):
+        return DummyAcquire(self._conn, self)
+
+
+class DummyBot:
+    def __init__(self, pg_pool, redis):
+        self.pg_pool = pg_pool
+        self.redis = redis
+
+
+def run_async(coro):
+    return asyncio.get_event_loop().run_until_complete(coro)
+
+
+def test_get_guild_prefix_caching(monkeypatch):
+    guild_id = 123
+    prefix = "!"
+
+    # Mock Postgres connection and pool
+    mock_conn = MagicMock()
+    mock_conn.fetchval = AsyncMock(return_value=prefix)
+    pg_pool = DummyPool(mock_conn)
+
+    # Mock redis client
+    redis_mock = MagicMock()
+    redis_mock.get = AsyncMock(side_effect=[None, prefix])
+    redis_mock.set = AsyncMock()
+
+    bot = DummyBot(pg_pool, redis_mock)
+    monkeypatch.setattr("settings_manager.get_bot_instance", lambda: bot)
+
+    cache_key = _get_redis_key(guild_id, "prefix")
+
+    # First call should hit Postgres and set Redis
+    result1 = run_async(get_guild_prefix(guild_id, "?"))
+    assert result1 == prefix
+    assert pg_pool.acquire_enter_called == 1
+    assert mock_conn.fetchval.call_count == 1
+    redis_mock.set.assert_called_once_with(cache_key, prefix, ex=3600)
+
+    # Second call should use Redis and not hit Postgres again
+    result2 = run_async(get_guild_prefix(guild_id, "?"))
+    assert result2 == prefix
+    assert pg_pool.acquire_enter_called == 1
+    assert mock_conn.fetchval.call_count == 1
+    assert redis_mock.get.call_count == 2
+    assert redis_mock.set.call_count == 1