test(calculate-empty-fallback): verify Edge Cases & Empty/Missing Inp…

[ShafinNigamana]

Description

Fixes #4274

Introduces a robust unit test suite at lib/calculate.empty-fallback.test.ts to verify the behavior of all core calculation helpers under empty, missing, or malformed parameters.

To prevent runtime crashes and ensure system stability, the utility functions in lib/calculate.ts were updated to gracefully handle null, undefined, empty arrays, and invalid timezone inputs (falling back safely to UTC timezone where applicable).

Pillar

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

Visual Preview

(N/A: This PR introduces logic checks and automated quality regression scripts to verify 100% calculation reliability under empty/missing boundaries).

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(calculate-empty-fallback): ...).
• 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 additions to the codebase's resilience. The defensive programming guards added to \lib/calculate.ts\ correctly prevent null reference exceptions or NaN errors when processing malformed or empty data structures from the GitHub API. This combined with the unit tests makes it a very strong PR.

Labels Applied:

• level:intermediate: Adding robust null handling across a complex file requires understanding of the data flow.
• type:bug: Prevents runtime exceptions.
• quality:clean: Great use of optional chaining and fallbacks.
• gssoc:approved
• mentor:Aamod007

[ShafinNigamana]

@JhaSourav07 I have solved the conflict, now you are good to merge!

[github-actions]

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

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