Install JUnit Plugin Manually in Netbeans 7.2.1

1. Download org-netbeans-libs-junit4.nbm manually http://dlc.sun.com.edgesuite.net/netbeans/updates/7.2.1/uc/final/certified/modules/extra/org-netbeans-libs-junit4.nbm

2. Download extra/org-netbeans-modules-junitlib.nbm manually http://dlc.sun.com.edgesuite.net/netbeans/updates/7.2.1/uc/final/certified/modules/extra/org-netbeans-modules-junitlib.nbm

3. Go to Tools > Plugins > Donwloaded > Add Plugins > Browse the two nbm files that you have downloaded.

4. Tick the JUnit, and JUnit 4 > Click Install.


Credit :
http://woodstechchannel.blogspot.com.au/2011/12/install-junit-plugin-manually-in.html