How to perform Junit test of this code? kindly solve this.

package com.company;
	import java.util.ArrayList;
	public class Jail extends Square {
	private ArrayList<Player> playersInJail;
	public Jail() {
	super();
	playersInJail = new ArrayList<>();
	}
	public String getSquareDetails() {
	return "This is a jail!";
	}
	//getters and setters
	public ArrayList<Player> getPlayersInJail()
	{
	return this.playersInJail;
	}
	public boolean isPlayerInJail(Player player) {
	for (Player playerInJail : playersInJail) {
	if (playerInJail == player) {
	return true;
	}
	}
	return false;
	}
	//additional methods
	public void putPlayerInJail(Player p)
	{
	this.playersInJail.add(p);
	}
	public boolean postBail(Player p)
	{
	if(p.getMoney()>500)
	{
	p.addMoney(-200);
	this.playersInJail.remove(p);
	return true;
	}
	//else
	return false;
	}
	}