Selenium webDriver test suite [duplicate] - selenium

Question

I'm using Selenium and TestNG for the first time and I've been trying to search an element by its ID but I keep getting an "Cannot instantiate class" error. This is my code:
import org.testng.annotations.*;
import org.openqa.selenium.*;
import org.openqa.selenium.firefox.*;
public class NewTesting {
WebDriver driver = new FirefoxDriver();
#BeforeTest
public void setUp() {
driver.get("http://book.theautomatedtester.co.uk/chapter1");
}
#AfterTest
public void tearDown() {
driver.quit();
}
#Test
public void testExample() {
WebElement element = driver.findElement(By.id("verifybutton"));
}
}
Maybe I missed installing something? I installed the TestNG plug-in for eclipse and added the WebDriver JAR files, do I need to do more?
I tried following multiple tutorials but I keep getting errors, I hope someone can help. Thanks in advance!
EDIT:
I now have this:
public class NewTest {
private WebDriver driver;
#BeforeTest
public void setUp() {
System.setProperty("webdriver.gecko.driver","C:\\Program Files\\Selenium\\FirefoxDriver\\geckodriver.exe");
WebDriver driver = new FirefoxDriver();
driver.get("http://book.theautomatedtester.co.uk/chapter1");
}
#AfterTest
public void tearDown() {
driver.quit();
}
#Test
public void testExample() {
WebElement element = driver.findElement(By.id("verifybutton"));
}
}
It does open the website now but I'm getting a nullpointer exception now:
FAILED CONFIGURATION: #AfterTest tearDown
java.lang.NullPointerException
at NewTest.tearDown(NewTest.java:21)

Answer 1

Replace this set of imports:
import org.testng.annotations.*;
import org.openqa.selenium.*;
import org.openqa.selenium.firefox.*;
With:
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.testng.Assert;
import org.testng.annotations.BeforeTest;
import org.testng.annotations.Test;
import org.testng.annotations.AfterTest;
Additionally, you have to download the required format of GeckoDriver executable from mozilla/geckodriver, extract the binary and then initialize the FirefoxDriver.
Your effective code block will be:
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.BeforeTest;
import org.testng.annotations.Test;
import org.testng.annotations.AfterTest;
public class NewTesting {
WebDriver driver;
#BeforeTest
public void setUp() {
System.setProperty("webdriver.gecko.driver","C:\\path\\to\\geckodriver.exe");
driver = new FirefoxDriver();
driver.get("http://book.theautomatedtester.co.uk/chapter1");
}
#AfterTest
public void tearDown() {
driver.quit();
}
#Test
public void testExample() {
WebElement element = driver.findElement(By.id("verifybutton"));
}
}

Answer 2

If you're on windows, this previous question may be some help to you.
It mentions that you can download geckodriver, and then initialize your FirefoxDriver like this:
System.setProperty("webdriver.gecko.driver","G:\\Selenium\\Firefox driver\\geckodriver.exe");
WebDriver driver = new FirefoxDriver();