Developed a comprehensive PhysicsMaterial Unit Test Suite for the godotengine/godot repository, focusing on validating default property values and dynamic property changes such as friction, roughness, bounce, and absorbency. Leveraging C++ and unit testing methodologies within the context of engine and game development, the work established a robust baseline for verifying the reliability of the physics subsystem. This suite enhances regression protection and supports safer future refactoring by ensuring that changes to physics materials do not introduce unintended behavior. The contribution laid the groundwork for expanding automated test coverage to additional physics-related components, promoting maintainable and reliable engine development practices.