I installed TestNG in Eclipse Luna and Eclipse Indigo but TestNG is not showing in the preferences window. I followed right step 2 times as mentioned at below link
http://www.guru99.com/all-about-testng-and-selenium.html
It is giving me the same problem in both versions of Eclipse... Any suggestion how to start working with TestNG?



I see, the question is quite old but I faced the same symptoms. For me the solution to this problem was to upgrade my Java installation from 1.6 to 1.8. After that the TestNG pluggin worked as expected.