test(layoutConstants): verify script edge cases and empty missing inputs fallback indicators (#4289)

[atharv96k]

🧩 Background

This PR addresses Issue #4289, focusing on establishing comprehensive, isolated unit and integration validation testing targeting Edge Cases & Empty/Missing Inputs Verification inside the canvas coordinate logic of lib/svg/layoutConstants.ts.

🎯 Objective

Introduces a brand-new, dependency-free test file lib/svg/layoutConstants.empty-fallback.test.ts to ensure that empty padding matrices, missing option blocks, or unconfigured design overrides default safely to standard fallback values rather than causing vector drawing clipping errors or layout computation collapses.

🛠️ Implementation Details

• Omitted Override Simulation: Validates canvas math operations against incoming type-safe configuration variables and omitted parameter arguments.
• Fallback Marker Checking: Confirms structural boundary indicators activate cleanly when layout configuration parameters are dropped.
• Style Isolation Protection: Asserts that presentation styling parameters and display formats (display: 'none') stay correctly mapped in default state configurations.
• Runtime Layout Resilience: Checks bounds properties programmatically to guarantee zero matrix generation crashes or layout execution exceptions without using forbidden any typings.

✅ Definition of Done

• 5 isolated test cases created and fully validated.
• vitest run layoutConstants.empty-fallback passes perfectly (5/5).
• npx tsc --noEmit runs completely clean with zero type errors.
• npm run lint clears with 0 errors across target files.

Fixes #4289

[github-actions]

📦 Next.js Bundle Size Report (Gzipped Sizes)

✨ No significant bundle size changes detected.

📊 Summary of Totals

Category	PR Size	Base Size	Difference
Total JS	3433.75 KB	3433.75 KB	0 B
Total CSS	258.05 KB	258.05 KB	0 B

[atharv96k]

@Aamod007 @JhaSourav07 PR is ready for #4289

[Aamod007]

Thanks for the empty-fallback coverage on layoutConstants. I reviewed the PR description, linked issue #4289, checks, and the diff before labeling.

Labels applied:

• level:beginner: the change is a single 88-line test file, lib/svg/layoutConstants.empty-fallback.test.ts, with five direct empty-state assertions in lines 7-88.
• quality:clean: the helper returns are explicit, and the cases are easy to read without extra mocking or test indirection.
• type:testing: the PR adds isolated test coverage for the empty/missing-input cases requested in the issue.
• type:logic: the assertions exercise the layout constant fallback logic directly, including null, undefined, and empty-array branches.

All required checks are green and the PR is not draft or blocked, so I’m approving and adding gssoc:approved.

[github-actions]

🎉 Congratulations @atharv96k! Your PR has been successfully merged. 🚀

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