public static void testAlert(WebDriver driver)
 {
  String url="http://sislands.com/coin70/week1/dialogbox.htm";
  driver.get(url);
  
  WebElement alertButton = driver.findElement(By.xpath("http://input[@value='alert']"));
  alertButton.click();
  
  Alert javascriptAlert = driver.switchTo().alert();
  System.out.println(javascriptAlert.getText());
  javascriptAlert.accept();
 }
 
 public static void testPrompt(WebDriver driver) throws Exception
 {
  String url="http://sislands.com/coin70/week1/dialogbox.htm";
  driver.get(url);
  
  WebElement promptButton = driver.findElement(By.xpath("http://input[@value='prompt']"));
  promptButton.click();
  Thread.sleep(2000);
  Alert javascriptPrompt = driver.switchTo().alert();
  javascriptPrompt.sendKeys("This is learning Selenium");
  javascriptPrompt.accept(); 
  
  System.out.println(javascriptPrompt.getText());
  
  javascriptPrompt=driver.switchTo().alert();
  javascriptPrompt.accept();
  
  Thread.sleep(2000);
  promptButton.click();
  javascriptPrompt=driver.switchTo().alert();
  javascriptPrompt.dismiss();
  Thread.sleep(2000);
  javascriptPrompt=driver.switchTo().alert();
  javascriptPrompt.accept();
 }
 
 public static void testConfirm(WebDriver driver) throws Exception
 {
  String url="http://sislands.com/coin70/week1/dialogbox.htm";
  driver.get(url);
  
  WebElement confirmButton = driver.findElement(By.xpath("http://input[@value='confirm']"));
  confirmButton.click();
  Thread.sleep(2000);
  Alert javascriptConfirm = driver.switchTo().alert();
  javascriptConfirm.accept();
  Thread.sleep(2000);
  javascriptConfirm = driver.switchTo().alert();
  javascriptConfirm.accept();
 }