Help with testing methods and classes in JUnit, using BlueJ

Hey all,

I need help with testing methods using JUnit. The editor we're using is BlueJ
This is my class:

Code:

---

package model;

import java.util.*;

public class Category
{
    private String name;
    private List<Appointment> appointments;
    private List<ToDo> toDos;
   
    public Category(String name)
    {
        this.name = name;
        appointments = new ArrayList<Appointment>();
        toDos = new ArrayList<ToDo>();
    }
   
    public String getName()
    {
        return this.name;
    }
   
    public void setName(String newName)
    {
        this.name = newName;
    }
   
    public void addAppointment(Appointment a)
    {
        appointments.add(a);
    }
   
    public void removeAppointment(Appointment a)
    {
        appointments.remove(a);
    }
   
    public void addToDo(ToDo t)
    {
        toDos.add(t);
    }
   
    public void removeToDo(ToDo t)
    {
        toDos.remove(t);
    }
   
    public List<Appointment> getAppointments()
    {
        return appointments;
    }
   
    public List<ToDo> getToDos()
    {
        return toDos;
    }
}

---

I don't even really know where to begin :(

If someone can just guide me on how to tackle this, i'd very much appreciate it