TestNG provides the @Listeners annotation which listens to each event that happens during a selenium code. Listeners are activated either before the test or after the test suit . it’s an interface that modifies the TestNG behavior. for instance , once you are running a test suit either through selenium or appium and suddenly a test suit fails. we’d like a screenshot of the test suit that has been failed, to realize such scenario, TestNG provides a mechanism, i.e., Listeners. When the test suit failure occurs, then it’s redirected to the new block written for the screenshot.

Listeners are implemented by the ITestListener interface. An ITestListener interface has the subsequent methods:

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onTestStart(): An onTestStart() is invoked only any test method gets started.

onTestSuccess(): An onTestSuccess() method is executed on the success of a test method.

onTestFailure(): An onTestFailure() method is invoked when test method fails.

onTestSkipped(): An onTestSkipped() run only any test method has been skipped.

onTestFailedButWithinSuccessPercentage(): This method is invoked whenever when the test method fails but within success percentage.

int a=5;
int b=7;
sum=a+b;
System.out.println(sum);
}
@Test
public void testtofail()
{
System.out.println("Test case has been failed");
Assert.assertTrue(false);
}
}

In the above code, we create two test cases, i.e., sum() and testtofail().

Listener.java

package com.tecklearn;
import org.testng.ITestContext;
import org.testng.ITestListener;
import org.testng.ITestResult;
public class Listener implements ITestListener
{
@Override
public void onTestStart(ITestResult result) {
// TODO Auto-generated method stub
}

@Override
public void onTestSuccess(ITestResult result) {
// TODO Auto-generated method stub
System.out.println("Success of test cases and its details are : "+result.getName());
}

@Override
public void onTestFailure(ITestResult result) {
// TODO Auto-generated method stub
System.out.println("Failure of test cases and its details are : "+result.getName());
}

@Override
public void onTestSkipped(ITestResult result) {
// TODO Auto-generated method stub
System.out.println("Skip of test cases and its details are : "+result.getName());
}

@Override
public void onTestFailedButWithinSuccessPercentage(ITestResult result) {
// TODO Auto-generated method stub
System.out.println("Failure of test cases and its details are : "+result.getName());
}

@Override
public void "1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<!-- Suite -->

Step 4: Run the testng.xml file. Right click on the testng.xml file and move the cursor right down to Run As then click on the 1 TestNG Suite.

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The above output shows that sum() test suit has been passed and testtofail() testcase has been failed.

Second case: Now we create the listeners by using testng.xml file.

Step 1: Open the Eclipse.

Step 2: we’ll create two java projects. One java project is containing the test cases and another project is containing listeners.

Testcases.java

package com.tecklearn;
import org.testng.Assert;
import org.testng.annotations.Test;
public class Testcases
{
@Test
public void testtopass()
{
Assert.assertTrue(true);
}

@Test
public void testtofail()
{
Assert.assertFalse(false);
}
}

Listener.java

package com.tecklearn;
import org.testng.ITestContext;
import org.testng.ITestListener;
import org.testng.ITestResult;

public class Listener implements ITestListener
{
@Override
public void onTestStart(ITestResult result) {
// TODO Auto-generated method stub
}

@Override
public void onTestSuccess(ITestResult result) {
// TODO Auto-generated method stub
System.out.println("Success of test cases and its details are : "+result.getName());
}

@Override
public void onTestFailure(ITestResult result) {
// TODO Auto-generated method stub
System.out.println("Failure of test cases and its details are : "+result.getName());
}

@Override
public void onTestSkipped(ITestResult result) {
// TODO Auto-generated method stub
System.out.println("Skip of test cases and its details are : "+result.getName());
}

@Override
public void onTestFailedButWithinSuccessPercentage(ITestResult result) {
// TODO Auto-generated method stub
System.out.println("Failure of test cases and its details are : "+result.getName());
}

@Override
public void "1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<!-- Suite -->

Step 4: Run the testng.xml file.

Output

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Note: When listeners are added to multiple classes then it might be a mistake prone. If listeners are implemented through the testng.xml file, then they’re applied to all or any the classes.

So, this brings us to the end of blog. This Tecklearn ‘How to create TestNG Listeners’ blog helps you with commonly asked questions if you are looking out for a job in Selenium and Automation Testing. If you wish to learn Selenium and build a career in Automation Testing domain, then check out our interactive, Selenium Certification Training, that comes with 24*7 support to guide you throughout your learning period. Please find the link for course details:

https://www.tecklearn.com/course/selenium-training-certification/

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Parallel Testing & Cross Browser Testing
TestNG Report: HTML Report, Console Report, XML Report

JUnit Operations and Test Framework

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