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I had tried to install TestNG manually and from the Market place, and I am able to see it installed under installation details, but when going to select New > Other > Select wizard and filtered by TestNG it only display JUnit even though TestNG has been installed, and I had also tried to uninstall and reinstall again and same issue.
Version: Neon.3 Release (4.6.3) Build id: 20170314-1500
Try adding it as a library through the build path. You can add both JUnit and TestNG that way. – Bill Hileman – 2019-05-20T20:15:03.570
I had also tried adding it by the build path and same issue, I am not sure if it is a defect on the IDE version. But I also install the IDE and reinstall and the issue persists. – Salvador – 2019-05-21T21:12:30.650