merge test()/testF() and testing()/testingF() into each other

[bxparks]

With some C-preprocessor hackery, it's possible to merge the 1-argument macro and the 1-argument macro into a single macro. Not sure if this is worth it or not.

[bxparks]

I think this is not worth it. The TEST_F() macro is an established macro in Google Test. Also, AUnit inherited a whole bunch of macros (assertTestXxxF(), checkTestXxxF(), testingF(), externTestF(), externTestingF()) from ArduinoUnit which would need the same cpp macro trick to merge into their equilvalent non-F forms. That's too much code clutter for not much value.