Contributed to the matplotlib/matplotlib repository by developing a targeted robustness test suite for the Artist.set method, focusing on error handling for invalid property access and duplicate aliases. This work involved expanding Python unit tests to exercise error paths, ensuring that the API raises appropriate exceptions when misused. The approach improved code quality by enabling earlier detection of edge-case failures and preventing user-facing regressions. Additional efforts included refining test suite hygiene through spacing and whitespace cleanup, supporting continuous integration readiness. Collaboration with other contributors ensured comprehensive coverage and maintainability, leveraging skills in Python, error handling, and automated testing throughout the process.