testngParallel.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">

<!-- Parallel = classes will run classes defined inside <test> in parallel, 
	thread-count will determine maximum number of test cases to be executed in parallel -->
	

<!-- Parallel = tests will run <test> in parallel, 
	thread-count will determine maximum number of test cases to be executed in parallel -->
	

<suite name="Suite" parallel="classes" thread-count="2">
  <test name="Test" >
    <classes>
      <class name="TestNG.testNGRedbus"/>
      <class name="TestNG.testNGMMT"/>
    </classes>
  </test>
  
</suite>