unity-testability

To unit test MonoBehaviour scripts in Unity, separate Unity-facing code from pure C# logic. Identify dependencies on Transform, GameObject, and scene state, then extract pure logic into isolated classes to enable reliable unit tests.

Separating pure C# logic from Unity-facing code requires identifying direct dependencies on Transform, GameObject, or global static state. Recommend seams and dependency-injection approaches to decouple configuration and enable mocking without scene state.

Plan EditMode and PlayMode tests by outlining which behaviors require scene-driven validation versus isolated unit tests. Identify candidate EditMode tests for pure C# logic and PlayMode tests for scene state and GameObject interactions within your Unity system.

Yes, dependency injection improves testability in Unity by decoupling MonoBehaviour scripts from scene state. Suggest seams and interfaces for mocking dependencies like Transform and GameObject, allowing logic to be reliably unit tested in EditMode.

Unity unit tests fail when depending on Transform and GameObject because these rely on scene state. Move logic out of Unity-facing classes into pure C# and use dependency injection to mock these dependencies, ensuring isolated test execution.