Installing TestNG in Eclipse
Step 1) Launch Eclipse.
- On the menu bar, click Help.
 
- Choose the "Install New Software…" option.
 

Step 2) In the Eclipse Install dialog box
- Enter "http://dl.bintray.com/testng-team/testng-eclipse-release/" in the Work with box
 
- Click the Add button.
 

Step 3) In Add repository dialog
- Enter "TestNG" in Name Text Field
 
- Click on Add button.
 

Step 4)
- Select the "TestNG" checkbox
 
- Click on the "Next" button.
 

Step 5) It will give you a review of Items to be installed. Click on Next.

Step 6)
- Select the radio button "I accept the terms of the license agreement"
 
- Click on Finish.
 
It will take time depending on your Internet speed.

Step 7) If you encounter a Security warning, just click "Install Anyway".

Step 8) Wait for the installation to finish. When Eclipse prompts you for a restart, click "Restart now."

Step 9) After the restart, verify if TestNG was indeed successfully installed. Click Window > Show View > Other.

Then open the Java directory and see if TestNG is included.

That's it to TestNG Installation