test(ut): remove useless mock

[chenjiahan]

Summary

Remove unnecessary mocks from the test files to simplify the test setup and improve maintainability.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR simplifies the test setup by removing unnecessary mocks in the test files to improve maintainability.

• Removed the vi.mock in html.test.ts
• Removed the vi.mock in cache.test.ts

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/core/tests/html.test.ts	Removed a vi.mock on '../src/helpers.js' to simplify tests
packages/core/tests/cache.test.ts	Removed a vi.mock on '../src/helpers.js' to simplify tests