public async Task AddAsync()
        {
            Number model = new Number
            {
                FirstNumber  = 1,
                SecondNumber = 2
            };
            var context = new ServiceController(logger.Object, dbContext);

            var respons = await context.AddAsync(model);

            logger.Verify(
                x => x.Log(
                    It.IsAny <LogLevel>(),
                    It.IsAny <EventId>(),
                    It.Is <It.IsAnyType>((v, t) => true),
                    It.IsAny <Exception>(),
                    It.Is <Func <It.IsAnyType, Exception, string> >((v, t) => true)));
        }