ShrinkModFramework/Tools~/HostTests/Runtime/UnityTestShim.cs

// Minimal engine boundary for .NET lifecycle tests; not a Unity runtime replacement.
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Reflection;

namespace UnityEngine
{
    public class Object
    {
        public static implicit operator bool(Object value) => value != null;
        public static void DestroyImmediate(Object value)
        {
            if (value is GameObject go) foreach (var component in go.Components)
                component.GetType().GetMethod("OnDestroy", BindingFlags.NonPublic | BindingFlags.Instance)?.Invoke(component, null);
        }
        public static void Destroy(Object value) => DestroyImmediate(value);
        public static void DontDestroyOnLoad(Object value) { }
    }
    public class ScriptableObject : Object { public static T CreateInstance<T>() where T : ScriptableObject, new() => new T(); }
    public class MonoBehaviour : Object { public GameObject gameObject; }
    public class GameObject : Object
    {
        internal readonly List<MonoBehaviour> Components = new();
        public GameObject(string name) { }
        public T AddComponent<T>() where T : MonoBehaviour, new() { var c = new T { gameObject = this }; Components.Add(c); return c; }
    }
    public static class Resources { public static T Load<T>(string path) where T : Object => null; }
    public static class Application { public static string persistentDataPath => System.IO.Path.GetTempPath(); public static bool isPlaying => false; }
    public static class Time { private static readonly Stopwatch Clock = Stopwatch.StartNew(); public static float realtimeSinceStartup => (float)Clock.Elapsed.TotalSeconds; }
    public static class Mathf { public static float Max(float a, float b) => Math.Max(a, b); }
    public enum LogType { Error, Assert, Warning, Log, Exception }
    public static class Debug
    {
        public static event Action<LogType, string> Logged;
        public static void Log(object value) => Logged?.Invoke(LogType.Log, value?.ToString());
        public static void LogWarning(object value) => Logged?.Invoke(LogType.Warning, value?.ToString());
        public static void LogError(object value) => Logged?.Invoke(LogType.Error, value?.ToString());
        public static void LogException(Exception value) => Logged?.Invoke(LogType.Exception, value.ToString());
    }
    public class CreateAssetMenuAttribute : Attribute { public string fileName, menuName; }
    public class HeaderAttribute : Attribute { public HeaderAttribute(string text) { } }
    public class TooltipAttribute : Attribute { public TooltipAttribute(string text) { } }
    public class MinAttribute : Attribute { public MinAttribute(float value) { } }
    public class SerializeField : Attribute { }
    public class DefaultExecutionOrder : Attribute { public DefaultExecutionOrder(int value) { } }
    public enum RuntimeInitializeLoadType { SubsystemRegistration, AfterAssembliesLoaded }
    public class RuntimeInitializeOnLoadMethodAttribute : Attribute { public RuntimeInitializeOnLoadMethodAttribute(RuntimeInitializeLoadType type) { } }
}