Sometimes it's difficult to ascertain what kind of testing you're doing. If you're unsure, try asking yourself these questions:

1. Is the sequence that your tests run in important?
2. Do you need/want more output than "..F.E"?
3. Are you struggling with fixtures when what you really want is variables?
4. Do you need to prepare your suites by hand? (i.e. can't rely on your test suite to be dynamically generated.)

If you answered yes to any of the preceding you may be doing some sort of functional testing. Even if you're decidedly not doing functional testing and you answered yes to some, you may want to use some of JFunc's functionality in your own unit testing.