Run JUnit test for all the sub directories having different versions of the same project

Let's say I have 50 different versions of the same project in 50 different directories under one parent directory. I have written the JUnit test to test the project in each directory and it works great. But the problem is I have to run it 50 times to get the test result.

Is there any way I can automate it to run the test on all the subdirectories under the parent directory?

I am using Eclipse right now. But willing to switch to Netbeans or any other tools but prefer Windows OS.