Problem is that my test is setting up behind "the real application" with real implementations

public class SeleniumTests : IDisposable { private readonly Context _ctx; private readonly IWebHost _host;

public void Dispose()
{
    _ctx.Database.EnsureDeleted();
    _host.Dispose();
}

public SeleniumTests()
{
    var o = new DbContextOptionsBuilder<Context>();
    o.UseInMemoryDatabase(Guid.NewGuid().ToString());
    _ctx = new Context(o.Options);

    _ctx.Database.EnsureDeleted();
    _ctx.Database.EnsureCreated();

    _host = new WebHostBuilder()
            .UseKestrel()
            .UseConfiguration
            (
                new ConfigurationBuilder()
                .AddJsonFile("appsettings.json")
                .Build()
            )
            .UseUrls($"http://localhost:5000/", $"https://localhost:5001/")
            .UseStartup<Startup>()
            .Build();

    _host.Start();
}

[Fact]
public async void MainPage()
{
    var driver = new FirefoxDriver($@".\SeleniumEngines\");
    try
    {
        driver.Navigate().GoToUrl("http://localhost:5000");
        await Task.Delay(50000);

        todo:
            _userService.AddUser("abc", "abc");
            driver.Navigate.GoToUrl("http://localhost:5000/login);
            driver fill login/password
            driver click submit
    }
    catch
    {
        driver.Quit();
        throw;
    }
    finally
    {
        driver.Quit();
    }
}

}