Migrating to NUnit from SpecRunner - Parallels Execution with Selenium

Question

I am migrating my test framework to NUnit from SpecRunner since SpecRunner is not longer maintained.

So far i am able to run the tests in parrallel by using the assembly code [assembly: Parallelizable(ParallelScope.Fixtures)]

However I am using Selenium to run my UI tests, currently when i run the tests only one browser instance in open (just testing on Chrome) for the two tests causing one of them to fail.

In SpecRunner I could specify the number of threads by specifying them in the default.srprofile file using the testThreadCount attribute.

<Execution stopAfterFailures="0" retryFor="Failing" testThreadCount="3" testSchedulingMode="Sequential" />

And that would open 3 instances of Chrome locally on my machine, and on the CI machine.

My question is : Can I do something similar in NUnit3 to run a chrome instance per thread?

UPDATE

GetWebDriver.cs

    public class GetWebDriver
    {
        private static TestContextModified context;

        public static string url;

        public static IWebDriver WebDriver(string browserName)
        {
            IWebDriver driver;
            context = TestContextModified.GetContextInstance();
            url = context.AppSetting["url"];
            var seleniumHubURL = context.AppSetting["seleniumGridServer"];

            switch (browserName)
            {
                case "IE":
                    try
                    {
                        if (context.AppSetting["REMOTE"] == "true")
                        {
                            InternetExplorerOptions options = new InternetExplorerOptions();

                            options.AddAdditionalCapability("ignoreProtectedModeSettings", true);

                            options.AddAdditionalCapability(CapabilityType.AcceptSslCertificates, true);

                            options.AddAdditionalCapability(CapabilityType.IsJavaScriptEnabled, true);

                            options.AddAdditionalCapability(CapabilityType.Platform,
                                new Platform(PlatformType.Windows));
                            driver = new RemoteWebDriver(
                                    new Uri(seleniumHubURL), options.ToCapabilities(), TimeSpan.FromSeconds(600))
                            { Url = url};
                        }
                        else
                        {
                            return new InternetExplorerDriver(new InternetExplorerOptions { IgnoreZoomLevel = true }) { Url = url};
                        }

                        return driver;
                    }
                    catch
                    {
                        string strCmdText;
                        strCmdText = @"/C cd bin\Debug&taskkill /im IEDriverServer.exe /f";
                        System.Diagnostics.Process.Start("CMD.exe", strCmdText);
                        Console.WriteLine("Deleted Chromedriver becouse Exception was raised");
                        return null;
                    }
                case "Chrome":
                    try
                    {
                        if (context.AppSetting["REMOTE"] == "true")
                        {
                            ChromeOptions options = new ChromeOptions();
                            options.AddArguments("--window-size=1920,1080");
                            options.AddArguments("--start-maximized");
                            options.AddArguments("--headless");
                            options.AddArgument("--disable-gpu");

                            driver = new RemoteWebDriver(
                                    new Uri(seleniumHubURL), options)
                            { Url = url};
                        }
                        else
                        {
                            return new ChromeDriver { Url = url};
                        }

                        return driver;
                    }
                    catch
                    {
                        string strCmdText;
                        strCmdText = @"/C cd bin\Debug&taskkill /im chromedriver.exe /f";
                        System.Diagnostics.Process.Start("CMD.exe", strCmdText);
                        Console.WriteLine("Deleted Chromedriver becouse Exception was raised");
                        return null;
                    }
                case "Firefox":
                    try
                    {
                        if (context.AppSetting["REMOTE"] == "true")
                        {
                            FirefoxOptions options = new FirefoxOptions();
                            driver = new RemoteWebDriver(
                                new Uri(seleniumHubURL), options);
                            return driver;
                        }
                        else
                        {
                            return new FirefoxDriver { Url = url};
                        }
                    }
                    catch
                    {
                        string strCmdText;
                        strCmdText = @"/C cd bin\Debug&taskkill /im geckodriver.exe /f";
                        System.Diagnostics.Process.Start("CMD.exe", strCmdText);
                        Console.WriteLine("Deleted Chromedriver becouse Exception was raised");
                        return null;
                    }

                case string browser: throw new NotSupportedException($"{browser} is not a supported browser");
                default: throw new NotSupportedException("not supported browser: <null>");
            }
        }
    }
}

IntiliazeWebdriver.cs

 public class IntializeWebdriver 

{
    public static IWebDriver driver;
    public IntializeWebdriver()
    {

    }
    public static IWebDriver webDriver()
    {
        if (driver == null)
        {
            driver = GetWebDriver.WebDriver("Chrome");
            return driver;
        }
        else
        {
            return driver;
        }
    }
}

And then in my steps:

  public class Steps: IntializeWebdriver
    {
        public Steps stepsTest;
        private ScenarioContext scenarioContext;
        public Steps(ScenarioContext _scenarioContext)
        {
            scenarioContext = _scenarioContext;
            stepsTest= new Step(webDriver());
        }
...

Answer 1

Looks like this line is causing issue :-

public static IWebDriver driver;

Can you try by not making this static? I remember that I faced issue in parallel execution via Nunit when the driver was static.