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Caching & Redis

Cache-aside, TTL, invalidation, hot keys, and in-memory lookup patterns at scale.

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Caching & Redis medium

How to Mock Cache Tag Invalidation in Python

Use unittest.mock.patch with wraps to verify tagged cache entries are invalidated correctly.

unittest mock cache
Python 
import unittest
from unittest.mock import patch

def get_cached_data(cache, key):
    """Return data from cache if present and valid, else None."""
    if cache.get(key, {}).get("valid", False):
        return cache[key]["data"]
    return None

def invalidate_tag_mock(cache, tag):
    """Invalidate all cache entries …
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