cache/lru: add regression test for cache.Size

[starius]

Added a regression test for #330

[gemini-code-assist]

Summary of Changes

Hello @starius, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a critical regression test for the LRU cache implementation. The new test, TestCacheSizeTracksMutations, ensures the cache.Size() method correctly maintains an accurate count of the total size of elements stored within the cache. This is vital for proper resource management and directly addresses a previous issue, enhancing the reliability of the cache's size accounting under dynamic conditions.

Highlights

• New Regression Test: A new regression test, TestCacheSizeTracksMutations, has been added to the LRU cache package.
• Cache Size Tracking: This test specifically verifies that the cache.Size() method accurately reflects the total byte size of elements within the cache across various operations, including insertions, evictions, replacements, and deletions.
• Addressing Prior Issue: The test serves as a regression for a previously identified issue related to cache size accounting, ensuring the fix remains robust.

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[gemini-code-assist]

Code Review

This pull request adds a valuable regression test for the cache.Size functionality, ensuring it correctly reflects the cache's state after various mutations like insertions, evictions, replacements, and deletions. The test cases are well-structured and cover the essential scenarios. I've added a couple of suggestions to make the test assertions more granular, which will help in pinpointing potential issues more precisely in the future.

[ffranr]

Good addition 👍

[starius]

Rebased this PR since #330 is merged.