如何与单例驱动程序并行运行测试？

Question

驱动程序是单例，我想并行运行测试，

注意：如果效果不佳则不使用单身

示例：

Singleton Class

public static class Driver
{
    public static IWebDriver GetInstance()
    {
        if (driver == null)
        {
                driver = new ChromeDriver(//PATH);              
        }
        return driver;
    }
    public static void SetNull()
    {
        driver = null;
    }
}

TestCase（父类）

[TestFixture, Apartment(ApartmentState.MTA)]
[Parallelizable(ParallelScope.Self)]
public class TestCase
{
    private IWebDriver driver;

    [SetUp]
    public void Initilize()
    {
        driver = Driver.GetInstance();
        Driver.GetInstance().Navigate().GoToUrl(ConfigurationManager.AppSettings["url"]);
        Driver.GetInstance().Manage().Window.Maximize();    
    }

    [TearDown]
    public void EndTest()
    {
        if (Driver.GetInstance() != null)
        {
            try
            {
                //Pending Logout
            }
            finally
            {
                Driver.GetInstance().Close();
                Driver.GetInstance().Quit();
                Driver.SetNull();
            }
        }
    }
}

TESTCASE 1,2,3 ... N

[TestFixture, Apartment(ApartmentState.MTA)]
class TC85874_Login : TestCase
{
    [Test, Apartment(ApartmentState.MTA)]
    public void TC_85874_Login(string user, string password)
    {
        try
        {


            //CODE


        }
        catch (Exception e)
        {



        }
    }
}

parallel： [assembly：LevelOfParallelism（3）]

装配 [装配：公寓（ApartmentState.MTA）]

我尝试 [Test，RequiresThread（ApartmentState.STA）] 和 RequiresThread属性 并且使用单例驱动程序

并行执行不正常

注意：如果效果不佳则不使用单身

C＃，Nunit 3