Generate TestNg.xml Dynamically

We can create a virtual testng.xml file yourself. In order to do this, you can use the classes found the packageorg.testng.xml: XmlClass, XmlTest, etc... Each of these classes correspond to their XML tag counterpart.

For example, suppose you want to create the following virtual file:
<suite name="TmpSuite" >
  <test name="TmpTest" >
    <classes>
      <class name="test.failures.Child"  />
    <classes>
    </test>
</suite>
You would use the following code:

XmlSuite suite = new XmlSuite();
suite.setName("TmpSuite");

XmlTest test = new XmlTest(suite);
test.setName("TmpTest");
List<XmlClass> classes = new ArrayList<XmlClass>();
classes.add(new XmlClass("test.failures.Child"));
test.setXmlClasses(classes) ;


And then you can pass this XmlSuite to TestNG:

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


Program
package org.nitin;

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

import org.openqa.selenium.chrome.ChromeDriver;
import org.testng.TestListenerAdapter;
import org.testng.TestNG;
import org.testng.annotations.Test;
import org.testng.xml.XmlClass;
import org.testng.xml.XmlSuite;
import org.testng.xml.XmlTest;

public class TCase1 {

 @Test
    public void TCase()
     {
  System.setProperty("webdriver.chrome.driver","C:\\Documents and Settings\\Administrator\\My Documents\\Downloads\\chromedriver_win32_2.1\\chromedriver.exe");
   ChromeDriver f = new ChromeDriver();
   f.get("http://mail.in.com");
   f.findElementById("f_id").sendKeys("uname");
   f.findElementById("f_pwd").sendKeys("pass");
   f.findElementByClassName("signin");
   XmlSuite suite = new XmlSuite();
   suite.setName("OMS");
   XmlTest test1 = new XmlTest(suite);
   test1.setName("TCase1");
   List<XmlClass> classes = new ArrayList<XmlClass>();
   classes.add(new XmlClass("org.nitin.TCase1"));
   List<XmlSuite> suite_a = new ArrayList<XmlSuite>();
   suite_a.add(suite);
   TestNG tng = new TestNG();
   tng.setXmlSuites(suite_a);
   tng.run();
   /*XmlSuite suite = new XmlSuite();
   suite.setName("OMS");
   
   XmlTest test = new XmlTest(suite);
   test.setName("Case1");
   List<XmlClass> classes = new ArrayList<XmlClass>();
   classes.add(new XmlClass("org.nitin.TCase1"));
   test.setXmlClasses(classes) ;
   List<XmlSuite> suites = new ArrayList<XmlSuite>();
   suites.add(suite);
   TestNG tng = new TestNG();
   tng.setXmlSuites(suites);
   tng.run();
 */

  }

}