chore: improve query maintenance path

[quyentonndbs]

Summary:

• Add edge-case unit tests for the utility helpers in query-core's utils.ts (e.g. replaceEqualDeep / hashKey / partialMatchKey) covering inputs that are currently under-tested — symbol-keyed objects, Date/RegExp/Map/Set instances, circular-safe shallow checks, undefined-vs-missing key semantics. Pure additive tests in the existing vitest file; no behavior change.
• Keep the change narrow so it is straightforward to review.

Notes:

• I kept this scoped to the relevant implementation and tests.

Summary by CodeRabbit

• Tests
  • Expanded test coverage for internal utility functions, including edge cases such as symbol-keyed properties, circular references, and various data type comparisons to improve code reliability.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 955cfe98-2874-4c0a-b41f-ebe1cfbe2450

📥 Commits

Reviewing files that changed from the base of the PR and between bde5a7f and 3d4ced3.

📒 Files selected for processing (1)

• packages/query-core/src/__tests__/utils.test.tsx

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📝 Walkthrough

Walkthrough

This PR expands test coverage for four utility functions in query-core by adding new test cases covering symbol properties, reference type equality, circular reference handling, depth limits, and special type hashing behavior across shallowEqualObjects, partialMatchKey, replaceEqualDeep, and hashKey.

Changes

Utility Function Test Coverage

Layer / File(s)	Summary
shallowEqualObjects test coverage packages/query-core/src/__tests__/utils.test.tsx	Tests added for symbol-keyed property handling (ignored in comparison), non-equality for Date and RegExp reference types despite identical content, and safe behavior with circular reference structures.
partialMatchKey test coverage packages/query-core/src/__tests__/utils.test.tsx	Tests added verifying directional matching behavior for undefined values and missing keys, and confirming Date, RegExp, Map, and Set match because they have no enumerable properties.
replaceEqualDeep test coverage packages/query-core/src/__tests__/utils.test.tsx	Tests added validating instance selection for Date, RegExp, Map, and Set even when deeply equal, depth limit bail-out at 501, and symbol-keyed property handling.
hashKey test coverage packages/query-core/src/__tests__/utils.test.tsx	Tests added ensuring symbol-keyed properties do not affect hash output, Date instances hash as ISO strings, and RegExp, Map, and Set hash as empty objects.

🎯 2 (Simple) | ⏱️ ~12 minutes

🐰 With tests so fine, now utility code will shine,
Each edge case caught, no more undefined surprises,
Symbols ignored, deep checks now honored,
Hashes and matches and reference compares—
Our query utilities stand with care! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Title check	❓ Inconclusive	The title 'chore: improve query maintenance path' is vague and does not specifically describe the main change of adding edge-case unit tests for utility helpers.	Consider a more specific title like 'test: add edge-case coverage for utility helpers' to clearly communicate the primary change.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description is well-structured, detailed, and addresses the template sections with clear explanations of the changes and scope, though the checklist boxes remain unchecked.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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