public async Task VisitRepository_GetUserCount_Test()
        {
            var context  = new MyCompanyContext();
            var employee = context.Employees.Include("Visits").Where(e => e.Visits.Any()).FirstOrDefault();
            var target   = new VisitRepository(context);
            var actual   = await target.GetUserCountAsync(employee.Email, string.Empty);

            Assert.AreEqual(employee.Visits.Count(), actual);
        }