How do I write test to check the browser scrolls down using webdriver, testng?

Question

I have a link that stays on same page but scrolls down the screen

if you go to websiste test.naimi.me and click here:

the link should scroll you down a little bit, how to test this action in selenium webdriver, i use testng and write in java.

EDIT:@Helping hands

    package erjan.test.naimi.me;

import java.util.concurrent.TimeUnit;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.testng.annotations.Test;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.AfterMethod;
import org.testng.Assert;
public class SpecialistLoads {
    WebDriver firefox ;
  @Test
  public void main() {
      //By.xpath("//a[@href=\"/astana/\"]/img") )) ;
      WebElement all_specs = firefox.findElement(By.xpath("//a[@href=\"/astana/#specialists\"]")) ;



      all_specs.click();
      String all_specalists_url = firefox.getCurrentUrl();
      Assert.assertEquals(all_specs, all_specialists_url );
  }
  @BeforeMethod
  public void beforeMethod() {
      firefox = new  FirefoxDriver() ;
      firefox.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
      //Launch the website
      firefox.get("http://test.naimi.me");
  }

  @AfterMethod
  public void afterMethod() {
      firefox.quit();

  }

}

The link the red arrow points to has html code:

a data-toggle="menu" href="/astana/#specialists">Все специалисты</a>

Answer 1

To test it, I would make usage of an indirect check.

Verify if a botton element of the page is visible after activating the link. I am more comfortable with the python code but in java the call should be:

WebElement.isDisplayed() to check if an element is visible

isDisplayed() is the method used to verify presence of a web element within the webpage. The method is designed to result a Boolean value with each success and failure. The method returns a “true” value if the specified web element is present on the web page and a “false” value if the web element is not present on the web page.

Example:

boolean footer_loaded=driver.findElement(By.id(“footer”)).isDisplayed();

Answer 2

If link is not visible when page load then you can use isdisplayed method like below :

WebElement link = driver.findElement(By.xpath(yourlinkxpath"));

If(link.isDisplayed())
{
   // Write code to click on link

}
else
{

  // Write code to skip it
}

To find link element you can use Id , xpath , class anything.

Answer 3

You can check the size of an element and its position relative to the viewport by Element.getBoundingClientRect() . You'll need to use driver.executeScript() for that.