Background & Motivation

The test suite needs to be aligned with the style guide while respecting pytest conventions. This is the final step to ensure the entire repository is compliant.

Proposed Changes

• Align all files in the tests/ directory with the Google Style Guide.
• Use tests/.pylintrc to handle pytest-specific patterns (like redefined-outer-name for fixtures).
• Perform a final make check and make presubmit to ensure everything is perfect.

Acceptance Criteria

• All test files pass pylint (with test-specific overrides).
• make presubmit runs cleanly for the entire repository.
• All tests pass.

_{This issue description was drafted by Gemini}