public void SetUp()
 {
     _nancySessionFromNancyContextResolver = _nancySessionFromNancyContextResolver.Fake();
     _userFromSessionResolver = _userFromSessionResolver.Fake();
     _voterIdentityFactory    = _voterIdentityFactory.Fake();
     _sut = new NancyIdentityFromContextAssigner(
         _nancySessionFromNancyContextResolver,
         _userFromSessionResolver,
         _voterIdentityFactory);
     _context = new NancyContext();
 }