How to test a method that takes an HttpContext?

Question

ASP.NET

I have an interface:

interface IAuthUserService 
{
    Task SignInAsync(HttpContext httpContext, string email, bool isPersistent = false);
    Task SignOutAsync(HttpContext httpContext);
}

I want to test it, but I don't understand how to lock HttpContext. Tried like this, but for some reason the test says that it's false, not true. How to fix?