Automated Testing (TDD/BDD/E2E) in game development https://elfgames.com/2019/06/25/automated-testing-in-video-games-a-case-study/

BDD-steps.xml

<?xml version="1.0" encoding="UTF-8"?>
<document>
  <steps>
    <wait>5</wait>
    <press>SkipIntro</press>
    <wait>3</wait>
    <press>Menu/Settings</press>
    <wait>3</wait>
    <press>SettingsTab/Options</press>
    
    ...
    <move>0,-9.67</move>
    <skip-dialogues />

  </steps>
</document>

E2ETestRunner.cs

public class E2ETestRunner : MonoBehavior {
	TestingInputHandler inputHandler = new TestingInputHandler();

	void Awake() {
		DontDestroyOnLoad(this);
	}

	public void RunTesting() {
		InputModule.ReplaceInput(inputHandler); // Use your fake input module
		var xmlFile = Resource.Load<TextAsset>("BDD-steps.xml"); // Load your testing suite
		xml = __PARSE_XML__(xmlFile); // Parse xml
		StartCoroutine(RunTestingRoutine(xml.SelectNodes("//step"))); // Starting the suite
	}

	IEnumerator RunTestingRoutine(XmlNodeList steps) {
		foreach (var step in steps) {
			CheckBugs(); // This method implements some generic checks, like finding Messages overflowing the canvas or exceptions in the console.

			switch (step.name) {
				case "click":
					__IMPLEMENTATION__;
					// i.e. Game.Find(step.InnerText).SendMessage("OnMouseDown");
					break;
				case "move":
					__IMPLEMENTATION__;
					break;
				case "wait":
					__IMPLEMENTATION__;
					// i.e. yield return new WaitForSeconds(float.Parse(step.InnerText));
					break;
				...
			}
		}
	}
}

InputHandlerInterface.cs

interface InputHandlerInterface {
  bool SubmitPressed();
  bool CancelPressed();
  ...

  Vector2 GetMovement();
}

public class RealInputHandler : InputHandlerInterface {
  ____ REAL IMPLEMENTATION THAT USES REAL INPUTS ____
}

public class TestingInputHandler : InputHandlerInterface {
  ____ FAKE IMPLEMENTATION, Controlled by the E2ETestRunner _____
}