How to ensure that the order specified in TestNG.xml is retained?

Question

On using TestNG+Selenium , I'm not able to ensure the order of execution of classes.The order specified below (in testng.xml) is not working ->ClassTwo executes first and then ClassOne is executed.

<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<suite name="ABC" parallel="">
  <test verbose="2" name="xyz" annotations="JDK" preserve-order="true">
    <classes>
      <class name="script.ClassOne"/>
      <class name="script.ClassTwo"/>
    </classes>
  </test>
</suite>

How can I ensure that the order specified in TestNG.xml is retained?

Answer 1

You just have to set parallel value to none

<suite name="ABC" parallel="none">

it works for me !

Answer 2

According to TestNG documentation:

By default, TestNG will run your tests in the order they are found in the XML file. If you want the classes and methods listed in this file to be run in an unpredictable order, set the preserve-order attribute to false

I would suggest leaving the preserve-order attribute out, since it is set by default.

However, you have two other options to force specific order to the test methods/classes:

1. Invoke tests programmatically.
2. Implement method interceptor, that will order the list of the tests.