How to Mock Time for Cache TTL Testing in Python

import time
from unittest.mock import patch

class ConfigCache:
    def __init__(self, ttl=60):
        self.ttl = ttl
        self._store = {}
        self._timestamps = {}

    def get(self, key):
        if key not in self._store:
            return None
        if time.time() - self._timestamps[key] > self.ttl:
            del self._store[key]
            del self._timestamps[key]
            return None
        return self._store[key]

    def set(self, key, value):
        self._store[key] = value
        self._timestamps[key] = time.time()

    def invalidate(self, key):
        self._store.pop(key, None)
        self._timestamps.pop(key, None)

if __name__ == "__main__":
    with patch("__main__.time.time") as mock_time:
        cache = ConfigCache(ttl=10)
        mock_time.return_value = 1000.0
        cache.set("db_host", "localhost")

        mock_time.return_value = 1005.0
        assert cache.get("db_host") == "localhost"

        mock_time.return_value = 1011.0
        assert cache.get("db_host") is None  # TTL expired

        cache.set("api_key", "secret")
        cache.invalidate("api_key")
        assert cache.get("api_key") is None

        print("All cache tests passed with mock time control")