Worked on the microsoft/testfx repository to deliver an automated code fixer that replaces TestCleanup methods with IDisposable.Dispose, aligning test cleanup with .NET best practices. Leveraged C# and Roslyn Analyzers to implement MSTEST0021-related tooling, ensuring that cleanup logic is consolidated under the IDisposable pattern for improved maintainability and consistency across test suites. Updated localization resources and modified test projects to support the new disposal-based cleanup approach, promoting deterministic resource management. Focused on code analysis, refactoring, and unit testing to reduce technical debt and standardize test lifecycle cleanup, resulting in a more maintainable and robust testing infrastructure for the project.