Refactor: assertions

[lohanidamodar]

• replace assertEquals with assertSame

Summary by CodeRabbit

• Tests
  • Strengthened test assertion strictness across domain, registrar, and validator test suites. Test assertions now enforce strict type-equality verification for improved reliability during development cycles.

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[coderabbitai]

Walkthrough

This pull request systematically upgrades PHPUnit assertions across three test files, replacing assertEquals with assertSame to enforce strict type and value equivalence. Changes are applied consistently across DomainTest.php (190 lines), OpenSRSTest.php (5 lines), and PublicDomainTest.php (23 lines), affecting numerous test methods for domain validation, registry operations, and public domain checks. No functional behavior or public entity declarations are altered.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Refactor: assertions' accurately describes the main change: replacing assertEquals with assertSame across test files for stricter type checking.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

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