How do I go about testing this code completely (in a class called TestCircle)? i

Question

How do I go about testing this code completely (in a class called TestCircle)?

import java.lang.Math;

public class Circle {
  
private int x;
  
private int y;
  
private int size;

@SuppressWarnings("unused")
private Circle(){

}
  
public Circle(int X, int Y){
set(X, Y, 1);
}
  
public Circle(int X, int Y, int s){
set(X, Y, s);
}

  
public int getX(){
return x;
}

public int getY(){
return y;
}

public int getSize(){
return size;
}
  
public void set(int X, int Y, int R){
x=X;
y=Y;
size=R;
}
  
public void setSize(int s){
size = s;
}
@Override
public String toString(){
return "Point: [(x:"+x+"), (y:"+y+"), (size:"+size+")]" ;
}
@Override
public boolean equals(Object obj){
if(obj instanceof Circle){
Circle parm = (Circle) obj;
return (parm.x==this.x)
&& (parm.y==this.y)
&& (parm.size==this.size);
}
else return false;
}
  
public double area(){
double area;
area = Math.PI*Math.pow(size, 2);

return area;
}

public static boolean intersect(Circle a, Circle b){

double distance;

distance = Math.sqrt(Math.pow(b.getX() - a.getX(), 2) + Math.pow(b.getY() - a.getY(), 2));

if(distance < a.getSize() + b.getSize())
return true;

return false;

}

public static boolean enclose(Circle a, Circle b){

double distance;

distance = Math.sqrt(Math.pow(b.getX() - a.getX(), 2) + Math.pow(b.getY() - a.getY(), 2));

if(distance + b.getSize() > a.getSize())
return false;

return true;
}

}

Explanation / Answer

import java.util.Scanner;
public class TestCircle{
public static void main(String[] args){
Circle circle1 = new Circle();
Circle circle2 = new Circle(2,2);
Circle circle3 = new Circle(4,2,2);
circle1.set(2,2,1);
if(circle1.getX()==2 && circle1.getY()==2 && circle1.getSize()==1)
System.out.println("First test passed: set function and Constructor1 working");
if(circle2.getX()==2 && circle2.getY()==2 && circle2.getSize()==1)
System.out.println("Second test passed: Constructor2 working");
if(circle3.getX()==4 && circle3.getY()==2 && circle3.getSize()==2)
System.out.println("Third test passed: Constructor3 working");
if(circle1.equals(circle2)==true)
System.out.println("Fourth test passed: equals method working");
if(circle1.area()==(Math.PI*Math.pow(1, 2)))
System.out.println("Fifth test passed: area method working");
if(circle1.intersect(circle3))
System.out.println("Sixth test passed: intersect method working");
circle1.set(4,2,1);
if(circle3.enclose(circle1))
System.out.println("Seventh test passed: enclose method working");
}
}

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