Install Eclipse TestNG plugin
Since TestNG Eclipse Plugin 6.9.10, there is a new optional plug-in for M2E (Maven Eclipse Plugin) integration. It's recommended to install it if your Java project(s) are managed by Maven.
Step 1: Navigate to Help->Install New Software
Step 2: paste url https://dl.bintray.com/testng-team/testng-eclipse-release/ in work with, select TestNG checkbox and click Next.
Step 3: Click Next.
Step 4: Click on I accept... and then Finish.
Step 5: Click Install anyway
Step 6: Click on Restart Now