Checking a button with TestNG - selenium

Question

I am new to the Selenium .
I need to check the availability of a button in the system and need to mark it pass and fail with AssertEquals.
Please help me .
#Test
public void sellercheck () throws InterruptedException
{
Thread.sleep(2000);
driver.findElement(By.id("UserEvent")).click();
//String r=Read.getvalue().get(0);
//select the seller
driver.findElement(By.id("LegacyNumberCriterion")).sendKeys("123456");
driver.findElement(By.id("SuperUse")).click();
System.out.println("seller number entered");
try
{
if(driver.findElements(By.id("OrganizationBranchId")).size()!=0)
{
driver.findElement(By.id("button1")).click();
}
else
{
System.out.println("The button is not available for the seller");
}
}
catch(NoSuchElementException e)
{
System.out.println("Element does not exist!");
}
}

Answer 1

You can choose from following 2 solutions which suitable to you:
1] Code to check element present or not using assertion in Selenium Webdriver would be something like this:
assertTrue(!isElementPresent(By.id("id of button")));
2] This assertion verifies that there are no matching elements in the DOM and returns the value of Zero, so the assertion passes when the element is not present. Also it would fail if it was present.
Assert.assertEquals(0, driver.findElement(By.id("id of button")).size());
Try this solution and let me know if it works.

Answer 2

Try this piece of code with some simple tweaks to your own code:
WebDriver driver;
#Test
public void sellercheck () throws InterruptedException
{
Thread.sleep(2000);
driver.findElement(By.id("UserEvent")).click();
//String r=Read.getvalue().get(0);
//select the seller
driver.findElement(By.id("LegacyNumberCriterion")).sendKeys("123456");
driver.findElement(By.id("SuperUse")).click();
System.out.println("seller number entered");
try
{
if(driver.findElements(By.id("OrganizationBranchId")).size()!=0)
{
driver.findElement(By.id("button1")).click();
}
else
{
System.out.println("The button is not available for the seller");
}
}catch(NoSuchElementException e)
{
System.out.println("Element does not exist!");
}
}
Let me know if this works for you or update me the error you see.