public void StartWithZeroEmplyees()
        {
            var result = sut.AllEmployees();

            Assert.IsNotNull(result);
            Assert.AreEqual(0, result.Count);
        }
        public void CanSeedEmployeesOnConstruct()
        {
            employees.Add(employee1.Ssn, employee1);
            employees.Add(employee2.Ssn, employee2);

            sut = new Registry(employees);

            var result = sut.AllEmployees();

            Assert.AreEqual(2, result.Count);
        }