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Caching & Redis

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

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How to Mock a Cache Key Schema Version Bump in Python

Show how to test a cache key schema bump by mocking the class-level version attribute with unittest.mock.

mock caching unittest
Python 
from unittest import mock

class VersionCache:
    SCHEMA_VERSION = 1

    def __init__(self, key_prefix="cache"):
        self.key_prefix = key_prefix

    def build_key(self, resource_id):
        return f"{self.key_prefix}:schema-v{self.SCHEMA_VERSION}:{resource_id}"

    def bump_schema(self):
        # Simulated …
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