Fake current user

BaseTest3.cs

public void FakeCurrentUser(int userId)
{
    var userRef = DataAccess.AppUserRepository.AllNoTracking.FirstOrDefault(u => u.AppUserId == userId);

    var securitySubstitude = Substitute.ForPartsOf<SecurityService>(
        Kernel.Get<IScopedDataAccess>(), 
        Kernel.Get<IMappingService>(),
        Kernel.Get<ILoggingService>(),
        Kernel.Get<IEnvironmentProxyService>());

    // ReSharper disable once ReturnValueOfPureMethodIsNotUsed
    securitySubstitude.When(x => x.GetUsername()).DoNotCallBase();
    securitySubstitude.GetUsername().Returns(userRef?.Username ?? "<none>");
    // ReSharper disable once ReturnValueOfPureMethodIsNotUsed
    securitySubstitude.When(x => x.GetCurrentUserId()).DoNotCallBase();
    securitySubstitude.GetCurrentUserId().Returns(userId); 

    Kernel.Rebind<ISecurityService>().ToConstant(securitySubstitude);
}