TorTests.cs

public IWebDriver Driver { get; set; }
public Process TorProcess { get; set; }
public WebDriverWait Wait { get; set; }

[TestInitialize]
public void SetupTest()
{
    String torBinaryPath = @"C:\Users\aangelov\Desktop\Tor Browser\Browser\firefox.exe";
    this.TorProcess = new Process();
    this.TorProcess.StartInfo.FileName = torBinaryPath;
    this.TorProcess.StartInfo.Arguments = "-n";
    this.TorProcess.StartInfo.WindowStyle = ProcessWindowStyle.Maximized;
    this.TorProcess.Start();

    FirefoxProfile profile = new FirefoxProfile();
    profile.SetPreference("network.proxy.type", 1);
    profile.SetPreference("network.proxy.socks", "127.0.0.1");
    profile.SetPreference("network.proxy.socks_port", 9150);
    this.Driver = new FirefoxDriver(profile);
    this.Wait = new WebDriverWait(this.Driver, TimeSpan.FromSeconds(60));
}

[TestCleanup]
public void TeardownTest()
{
    this.Driver.Quit();
    this.TorProcess.Kill();
}