test: add tests for Padding constructor and properties

[Sachinn-64]

Resolves None.

Description

What is the purpose of this pull request?

This pull request:

• test: add tests for Padding constructor and properties

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• None

Questions

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No.

Other

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No.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

AI Assistance

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• Yes
• No

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• Code generation (e.g., when writing an implementation or fixing a bug)
• Test/benchmark generation
• Documentation (including examples)
• Research and understanding

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If you answered "yes" to using AI assistance, please provide a short disclosure indicating how you used AI assistance. This helps reviewers determine how much scrutiny to apply when reviewing your contribution. Example disclosures: "This PR was written primarily by Claude Code." or "I consulted ChatGPT to understand the codebase, but the proposed changes were fully authored manually by myself.".

{{TODO: add disclosure if applicable}}

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@stdlib-js/reviewers

[Sachinn-64]

/stdlib update-copyright-years

[stdlib-bot]

/stdlib update-copyright-years

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[Sachinn-64]

/stdlib update-copyright-years

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/stdlib update-copyright-years

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[gururaj1512]

LGTM

[kgryte]

LGTM

[kgryte]

As the CI failure is expected, I'll go ahead and merge.