public void TestSetFirst_Throws_Exception_When_Size_0()
{
LinkedList <Employee> linkedList = new LinkedList <Employee>();
Employee emp1 = new Employee(1);
Assert.That(() => linkedList.SetFirst(emp1), Throws.Exception.TypeOf <IndexOutOfRangeException>());
}
public void TestSetFirst_Success()
{
LinkedList <Employee> linkedList = new LinkedList <Employee>();
Employee emp1 = new Employee(1);
Employee emp2 = new Employee(2);
linkedList.InsertData(emp1);
linkedList.SetFirst(emp2);
Assert.That(linkedList.GetFirst(), Is.EqualTo(emp2));
}