An employee management example of mocking and unit testing with correct exception handling

Handling exceptions is an essential part of writing robust and reliable code. In an employee management example, you might encounter various scenarios where exceptions need to be handled, such as database errors, file I/O issues, or validation problems.

In this section, we will write some sample code for an employee management system that employs correct exception handling and write unit tests with Moq objects to ensure our code works as we expect.

First, we need an Employee class:

public class Employee{
    public int EmployeeId { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public DateTime BirthDate { get; set; }
}

We can now add our EmployeeManager class:

public class EmployeeManager{
    // Simulating a database operation...