1.1. Example of IExecutionListener

1.1. Example of IExecutionListener

IExecutionListener is a listener that monitors the beginning and end of a TestNG run. It has two methods,onExecutionStart() and onExecutionFinish(). Method onExecutionStart() is called before the TestNG starts running the suites and onExecutionFinish() is called after TestNG is done running all the test suites.

In the below example, we will create two IExecutionListener listeners, ExecutionListener1 and ExecutionListener2. In classExecutionListener1, in method onExecutionStart()

Example  Demo :

	// ExecutionListener1
	package com.Iexecutelistener;
	import org.testng.IExecutionListener;
	public class ExecutionListener1 implements IExecutionListener {
	private long startTime;
	@Override
	public void onExecutionStart() {
	startTime = System.currentTimeMillis();
	System.out.println("Starting On execution test from ExecutionListener1 ");
	}
	@Override
	public void onExecutionFinish() {
	System.out.println("Starting On execution test has finished, took around " + (System.currentTimeMillis() - startTime) + "ms");
	}
	}

view raw 1ExecutionListener1.java hosted with ❤ by GitHub

	// ExecutionListener2
	package com.Iexecutelistener;
	import org.testng.IExecutionListener;
	public class ExecutionListener2 implements IExecutionListener {
	@Override
	public void onExecutionStart() {
	System.out.println("Starting On execution test from ExecutionListener2");
	}
	@Override
	public void onExecutionFinish() {
	System.out.println("Starting On execution test TestNG is finished");
	}
	}

view raw 2ExecutionListener2.java hosted with ❤ by GitHub

	Create a testNG test class TestClass, it has a @BeforeSuite, a test and an @AfterSuite method.
	package com.Iexecutelistener;
	import org.testng.annotations.BeforeSuite;
	import org.testng.annotations.Test;
	public class TestClass {
	@BeforeSuite
	public void beforeSuite() {
	System.out.println("Am in Before Suite");
	}
	@Test
	public void t() {
	System.out.println("In Test Method t...");
	}
	}

view raw 3.TestClass.java hosted with ❤ by GitHub

	Create XML file that calls these listeners like;
	<?xml version="1.0" encoding="UTF-8"?>
	<suite name="Suite" parallel="false">
	<listeners>
	<listener class-name="com.Iexecutelistener.ExecutionListener1" />
	<listener class-name="com.Iexecutelistener.ExecutionListener2" />
	</listeners>
	<test name="Test">
	<classes>
	<class name="com.Iexecutelistener.TestClass" />
	</classes>
	</test>
	</suite>

view raw 4.testng.xml hosted with ❤ by GitHub

In the output, you can see one set of messages are printed before TestNG starts running the suites and the other set of messages are printed once all the suites have been run.

Output :
Starting On execution test from ExecutionListener1
Starting On execution test from ExecutionListener2
[TestNG] Running:


Am in Before Suite
In Test Method t...

===============================================
Suite
Total tests run: 1, Failures: 0, Skips: 0