I have attached POM, BaseTest and Test classes. Im getting NullPointerException for the below code on trying to run it as TestNG test by right clicking on the project. Please could suggest?
POM Class:
package pom;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.support.FindBy;
import org.openqa.selenium.support.PageFactory;
public class Introduction
{
@FindBy(xpath="//a[text()='Hello. Sign In']")
WebElement signInLink;
public Introduction(WebDriver driver)
{
PageFactory.initElements(driver, this);
}
public void signIn()
{
signInLink.click();
}
}
BaseTest Class:
package scripts;
import java.util.concurrent.TimeUnit;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.testng.annotations.*;
public class BaseTest
{
public WebDriver driver;
@BeforeSuite
public void preCondition()
{
driver= new FirefoxDriver();
driver.get("https://www.walmart.com/");
driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
}
@AfterSuite
public void postCondition()
{
driver.close();
}
}
Test Class:
package scripts;
import org.testng.annotations.Test;
import pom.Introduction;
public class SignIn extends BaseTest
{
@Test
public void validSignIn()
{
Introduction i= new Introduction(driver);
i.signIn();
}
}
Your code has a few issues.
@BeforeSuite
. This causes your webdriver instance to be created ONLY once per <suite>
tag. So all other @Test
methods will always get a NullPointerException
because the @BeforeSuite
annotated method doesn't get executed the second time. So to get started, I would suggest that change your test code to something like below
BaseTest.java
package scripts;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.testng.annotations.*;
public class BaseTest {
private static ThreadLocal<WebDriver> driver = new ThreadLocal<>();
@BeforeMethod
public void preCondition() {
driver.set(new FirefoxDriver());
driver.get().get("https://www.walmart.com/");
}
@AfterMethod
public void postCondition() {
driver.get().quit();
}
public final WebDriver driver() {
return driver.get();
}
}
SignIn.java
package scripts;
import org.testng.annotations.Test;
import pom.Introduction;
public class SignIn extends BaseTest {
@Test
public void validSignIn() {
Introduction i = new Introduction(driver());
i.signIn();
}
}
Here what we have done is chose to use @BeforeMethod
and @AfterMethod
for instantiation and cleanup of webdriver, because these methods are guaranteed to be executed before and after every @Test
method. We then went on to using ThreadLocal
variants of Webdriver
because ThreadLocal ensures that every thread gets its own copy of webdriver, so that you can easily start running your tests in parallel. This is right now not a problem, but very soon you will face this issue as you start building upon your implementation. You can read more about how to resort to parallel executions using TestNG by reading this blog post of mine.
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