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I made this simple Ant file which calls NME tests. Hopefully someone will find it useful as a starting point for more complex purposes. I'm using it so I don't have to visit the Terminal.
Copy>Paste the code below into your text editor. Change the "nmePath" and "nmmlFile" properties to match your situation. If you're on a Mac, the nmePath should be okay.
Save the file in your project directory (I used "src/ant/NME-Build.xml") and then go to the FDT Ant tab and click the little "add buildfiles" button to select the file. Once that's done you can see "NME-Build" in the tasks list, plus a list of targets. Double-click the targets to make the magic happen.