public async Task ReturnTrue_WhenInviteExists()
        {
            var  handler = new UserHasCampaignManagerInviteQueryHandler(Context);
            bool result  = await handler.Handle(new UserHasCampaignManagerInviteQuery { InviteeEmail = "*****@*****.**", CampaignId = 5 });

            result.ShouldBeTrue();
        }
        public async Task ReturnFalse_WhenInviteDoesNotExist()
        {
            var  handler = new UserHasCampaignManagerInviteQueryHandler(Context);
            bool result  = await handler.Handle(new UserHasCampaignManagerInviteQuery { InviteeEmail = "*****@*****.**", CampaignId = 5 });

            result.ShouldBeFalse();
        }