During April 2025, Matts refactored the PTE Solver testing suite in the lanl/singularity-eos repository to enhance organization and maintainability for phase equilibrium calculations. He consolidated material specifications into dedicated files and centralized test inputs and outputs, streamlining the structure of both 2- and 3-phase test scenarios. Using C++ and applying principles of software design and testing, Matts reduced duplication and improved reproducibility by ensuring identical test workflows with toggleable comments. This work addressed test drift and simplified onboarding for new materials, resulting in a more robust and maintainable testing framework codified in a single, well-documented commit.