How to make testng.xml at runtime or programmatically

We might face some scenarios where we have to make a testng.xml file at runtime or programmatically. So, in this post, we will learn how to make a testng.xml file at runtime and execute it.

Let’s first create a test case that we want to execute programmatically

package Test;

import org.testng.Assert;
import org.testng.annotations.Test;

public class CodekruTest {

	@Test
	public void executeTest() {
		System.out.println("Excecuting the test");
		Assert.assertTrue(true);
	}
}

We will create a testng.xml file that will help us run the above test case.

<suite name="codekru">
	<test name="codekru">
		<classes>
			<class name="Test.CodekruTest" />
		</classes>
	</test>
</suite>

The above XML file will execute every test case under CodekruTest class.

Output –

Excecuting the test

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

Now, how to create the above XML file programmatically?

We have equivalents of the <suite>, <test>, <class> tags in org.testng package.

<suite> is equivalent to XmlSuite class.
<test> is equivalent to XmlTest class.
<class> is equivalent to XmlClass class.

So, keeping that in mind, and let’s try to make the equivalent of the above XML file, it will look something like this.

		XmlSuite suite = new XmlSuite();
		suite.setName("codekru"); // this means <suite name = "codekru">

		XmlTest test = new XmlTest(suite);
		test.setName("codekru"); // this means <test name = "codekru">
		List<XmlClass> classes = new ArrayList<XmlClass>(); // <classes>
		classes.add(new XmlClass("Test.CodekruTest")); // this means <class name = "Test.CodekruTest">
		test.setXmlClasses(classes);

To execute the suite named “codekru”, we have to make a TestNG object and pass a list of suites to it, as shown below.

		List<XmlSuite> suites = new ArrayList<XmlSuite>();
		suites.add(suite);
		TestNG testng = new TestNG();
		testng.setXmlSuites(suites);
		testng.run();

So, the whole class would be

import java.util.ArrayList;
import java.util.List;

import org.testng.TestNG;
import org.testng.xml.XmlClass;
import org.testng.xml.XmlSuite;
import org.testng.xml.XmlTest;

public class GenerateXmlAndExecuteItAtRuntime {
	
	public static void main(String[] args) {
		XmlSuite suite = new XmlSuite();
		suite.setName("codekru"); // this means <suite name = "codekru">

		XmlTest test = new XmlTest(suite);
		test.setName("codekru"); // this means <test name = "codekru">
		List<XmlClass> classes = new ArrayList<XmlClass>(); // <classes>
		classes.add(new XmlClass("Test.CodekruTest")); // this means <class name = "Test.CodekruTest">
		test.setXmlClasses(classes);

		List<XmlSuite> suites = new ArrayList<XmlSuite>();
		suites.add(suite);
		TestNG testng = new TestNG();
		testng.setXmlSuites(suites);
		testng.run();
	}
}

Now, run this main() method like a standard java application and all test cases under Test.CodekruTest will also execute.

Output –

Excecuting the test

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

There are many “What If” scenarios that are left –

Don’t worry. We have covered it all, too. Give it a try in our next post.

We hope that you liked the article. If you have any doubts, please feel free to write us in the comments or mail us at admin@codekru.com.

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Now, how to create the above XML file programmatically?

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