test(cache-massive-scaling): verify Massive Data Sets and Extreme Hig…

[ShafinNigamana]

Description

Fixes #4389

Introduces a robust unit and performance testing suite at lib/cache.massive-scaling.test.ts to verify the stability, memory footprint, and CPU latency of TTLCache and DistributedCache under massive data sizes and high-volume workloads.

These tests verify:

• Automatic Brotli Compression/Decompression: Storing and retrieving arrays with 10,000 contributor actions (approx. 3MB of JSON) or large string values (>1KB) and checking that they are compressed to a Buffer inside the cache Map.
• LRU/Capacity Eviction: Verifying that caches with a small maxSize (e.g. 5) successfully evict the oldest entries when loaded with 10,000 keys.
• High-Frequency Execution Latency: Timing 1,000 rapid operations with 2KB payloads to assert they complete in under 1.5 seconds.
• Cache Stampede Prevention: Deduplicating 500 concurrent fetches for the same key to verify L1 Promise locking works under load and executes the load function exactly once.
• Key Length Constraints: Ensuring key lengths are validated and rejected above 10,000 characters to prevent memory bloat.

Pillar

• 🎨 Pillar 1 — New Theme Design
• 📐 Pillar 2 — Geometric SVG Improvement
• 🕐 Pillar 3 — Timezone Logic Optimization
• 🛠️ Other (Bug fix, refactoring, docs, performance & tests)

Visual Preview

(N/A: Logic and performance testing suite).

Checklist before requesting a review:

• I have read the CONTRIBUTING.md file.
• I have tested these changes locally.
• I have run npm run format and npm run lint locally and resolved all errors (CI will fail otherwise).
• My commits follow the Conventional Commits format (e.g., test(cache-massive-scaling): ...).
• I have updated README.md if I added a new theme or URL parameter.
• I have starred the repo.
• I have made sure that i have only one commit to merge in this PR.
• The SVG output matches the CommitPulse "premium quality" aesthetic standard (no raw elements, smooth animations, correct fonts).

[Aamod-Dev]

Excellent work on this test suite! The tests are extremely robust and cover highly complex scenarios like cache stampedes (Promise deduplication), internal Brotli Buffer assertion, and LRU eviction under massive load. This adds a huge amount of confidence to the caching layer.

Labels Applied:

• level:advanced: Testing concurrency, compression layers, and eviction mechanics requires deep architectural understanding.
• type:testing: The PR adds performance testing.
• quality:exceptional: Exceptionally well-written tests that cover edge cases that are typically hard to test (like stampede prevention).
• gssoc:approved
• mentor:Aamod007

[github-actions]

🎉 Congratulations @ShafinNigamana! Your PR has been successfully merged. 🚀

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[ShafinNigamana]

@JhaSourav07 add gssoc 2026 label