BepInEx/BepInExTests/AssemblyInit.cs

using System.IO;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace BepInEx.Tests;

[TestClass]
public class AssemblyInit
{
    private static string _testPath;

    [AssemblyInitialize]
    public static void InitAss(TestContext context)
    {
        _testPath = Path.Combine(Path.GetTempPath(), "BepinexTestDir");
        Directory.CreateDirectory(_testPath);

        var exePath = Path.Combine(_testPath, "Text.exe");
        File.WriteAllBytes(exePath, new byte[] { });

        Paths.SetExecutablePath(_testPath);
    }

    [AssemblyCleanup]
    public static void CleanupAss() => Directory.Delete(_testPath, true);
}