test(useLocalStorage-massive-scaling): verify Massive Data Sets and E…

[ShafinNigamana]

Description

Fixes #4386

Introduces a robust unit and performance testing suite at hooks/useLocalStorage.massive-scaling.test.ts to verify the stability, memory footprint, and CPU latency of the custom useLocalStorage React hook under massive data sizes and high-volume state updates.

These tests verify:

• Large Dataset Serialization & Deserialization: Storing and loading large 5,000-item arrays representing contributor logs and checking that state hydrates and persists without crashing.
• Quota Exceeded Resilience: Simulating quota limit exception throws on localStorage.setItem and verifying that the React hook local state still updates correctly.
• High-Frequency Execution Latency: Timing 200 operations on a 500KB JSON payload to assert they execute in under 500ms.
• Key Length Constraints: Ensuring keys of exactly 10,000 characters function correctly.
• High-Frequency Update Queueing: Queueing 1,000 sequential state updates within a single batch/render loop to verify the hook resolves to the final value cleanly.

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: Hook 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(useLocalStorage-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]

Summary

The PR follows a known pattern of AI-generated superficial test files or inappropriate modifications that provide little to no meaningful runtime coverage and clutter the repository.

Required Changes

Issue 1

• Problem: The test file creates or simulates interactions on dummy structures, or simply adds redundant tests.
• Impact: It provides 0 real test coverage.
• Required Fix: Ensure the PR tests actual new runtime behavior and does not just add redundant tests.

[ShafinNigamana]

Summary

The PR follows a known pattern of AI-generated superficial test files or inappropriate modifications that provide little to no meaningful runtime coverage and clutter the repository.

Required Changes

Issue 1

• Problem: The test file creates or simulates interactions on dummy structures, or simply adds redundant tests.
• Impact: It provides 0 real test coverage.
• Required Fix: Ensure the PR tests actual new runtime behavior and does not just add redundant tests.

I’ve rewritten the test suite to avoid isolated unit mocks. It now binds useLocalStorage to a mock React SVG visualizer component to verify actual runtime grid rendering, coordinate scaling, and state updates under simulated storage quota exceed limits.

[github-actions]

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