Worked on enhancing the phetsims/perennial repository by developing new unit test features for the quantum-bound-states simulation. Focused on expanding unit test coverage using JavaScript to improve reliability and facilitate early defect detection within simulation development. The approach involved aligning the new tests with poly integration, ensuring that results remained reproducible and validation workflows were streamlined. By delivering the Quantum Bound States Unit Test Enhancements, the work strengthened verification processes and improved regression safety for the simulation. Emphasized unit testing best practices throughout, contributing to more robust simulation code and supporting ongoing efforts to maintain high-quality standards in scientific software development.