Can I run a single unit test from the command line for a Grails project?

I've been running my Grails unit tests by typing grails test-app :unit, which runs all unit tests. Is there a way to specify a single test?

Edit: So far, everyone is basically saying the same thing, but when I do that, no tests are run. Any more thoughts?

Conclusion: OK, I was using the name of the test class, rather than the name of the class being tested. Once I tried Foo instead of FooTests it worked perfectly.