fix(auth): Fix test coverage for mtls_helper

[andyrzhao]

Uses the conventional mock.patch decorators instead of monkeypatch to satisfy the coverage analyzer. This brings coverage from 99% to 100%

[gemini-code-assist]

Summary of Changes

Hello @andyrzhao, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the test suite for the mtls_helper module by migrating from monkeypatch to mock.patch decorators. This strategic refactoring ensures that the test coverage analyzer can accurately report 100% coverage for the module, improving the reliability and maintainability of the authentication-related utilities.

Highlights

• Test Refactoring: The tests for _mtls_helper.check_use_client_cert have been refactored to replace monkeypatch with mock.patch decorators for environment variable and file system mocking.
• Coverage Improvement: This change specifically addresses test coverage analysis, bringing the coverage for the mtls_helper module from 99% to 100% by using conventional mocking techniques that are better recognized by coverage tools.

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[gemini-code-assist]

Code Review

This pull request refactors the tests for _mtls_helper.check_use_client_cert to use mock.patch decorators instead of monkeypatch, which resolves a coverage analysis issue and improves test structure. The changes are well-implemented and the new tests are more organized and comprehensive. I've suggested adding a couple more test cases to cover additional error scenarios (TypeError and OSError) to make the test suite even more robust.