public void AddRsvp_CorrectData_CallingEntityWrapperAddRsvpItem()
{
// setup
var rsvp = new RSVP {
Name = "Mister Test", Email = "*****@*****.**"
};
// action
_postHelper.AddRsvp(rsvp);
// assert
_entityWrapper.Received().AddRsvpItem(Arg.Any <RSVP>());
}