public void should_get_total_cost_for_department()
 {
     var department = new Department("DepartmentName");
     department.AddStaff(new Employee("Kent", "1", 10));
     department.AddStaff(new Employee("Martin", "1", 20));
     Assert.Equal(30, department.GetTotalAnnualCost());
 }
 public void should_get_name_for_department()
 {
     var department = new Department("DepartmentName");
     Assert.Equal("DepartmentName", department.Name);
 }