Need help with mouse and button event

[Krerkchai Kusolchu]

Hi,

Forums users, I am just starting to learn about junit with some experiences programming in java (most of my programming was experiences in c). I would like to So I have decided to try out testing out a scribble applet with junit. However, I have run into a major problem with the testing which maybe due to my inexperience with java. I don't really know how to simulate the button and mouse click for the scribble applet. If any one can help point me out in the right direction, i would be very grateful.

Here are my codes and the scribble applet (http://oreilly.com/catalog/javanut/examples/section1/Scribble.java) I wanted to test. Also thank you in advance for an kind of help or guidance.

package scribble; 

import java.awt.Color; 
import java.awt.Event; 
import org.junit.After; 
import org.junit.AfterClass; 
import static org.junit.Assert.*; 
import org.junit.Before; 
import org.junit.BeforeClass; 
import org.junit.Test; 

public class ScribbleTest { 
    
    public ScribbleTest() { 
    } 
    
    Scribble instance = null; 
    @BeforeClass 
    public static void setUpClass() { 
    } 
    
    @AfterClass 
    public static void tearDownClass() { 
    } 
    
    @Before 
    public void setUp() throws InterruptedException { 
        instance = new Scribble(); 
        instance.init(); 
        instance.setVisible(true); 
    } 
    
    @After 
    public void tearDown() { 
    } 

    /** 
     * Test of mouseDown method, of class Scribble. 
     */ 
    @Test 
    public void testMouseDown() { 
        System.out.println("Testing mouseDown"); 
        Event e = null; 
        int x = 100; 
        int y = 200; 
        boolean expResult = true; 
        boolean result = instance.mouseDown(e, x, y); 
        assertEquals(expResult, result); 
    } 

    /** 
     * Test of mouseDrag method, of class Scribble. 
     */ 
    @Test 
    public void mouseDrag() { 
        System.out.println("Testing mouseDown"); 
        Event e = null; 
        int x = 100; 
        int y = 200; 
        boolean expResult = true; 
        boolean result = instance.mouseDrag(e, x, y); 
        assertEquals(expResult, result); 
    } 
    
    /** 
     * Test of clear_button condition of action method, of class Scribble. 
     */ 
    @Test 
    public void clear_button() { 
        System.out.println("Testing the clear button"); 
        Color expResult = instance.getBackground(); 
        Event e = instance.clear_button; 
        boolean result = instance.action(e, "green"); 
        assertEquals(expResult, result); 
    } 
        
    /** 
     * Test of color_choices condition of action method, of class Scribble. 
     */ 
    @Test 
    public void color_choices() { 
        System.out.println("Testing the color button"); 
        Color  expResult = Color.green; 
        Event e = instance.clear_button; 
        boolean result = instance.action(e, "green"); 
        assertEquals(expResult, result); 
    } 
    
    /** 
     * Test Painting. 
     */ 
    @Test 
    public void testPainting() { 
        int x = 100; 
        int y = 200; 
        Event e = null; 
        instance.mouseDown(e, x, y); 
        for (int i = 0; i < 50; i++) { 
            instance.mouseDrag(e, x + 1, y + 1); 
            x++; 
            y++; 
        } 
    } 
        
}