tests/lex/test_lex.py: Add a few tests to cover identifier mangling
tests/lex/test_lex.py: Add a few tests to cover identifier mangling

Signed-off-by: Gergely Nagy <6780fac3b38619ac20422286e4110a70dbba2203@madhouse-project.org>

zackmdavis/hy,tianon/hy,michel-slm/hy,kirbyfan64/hy,Tritlo/hy,tianon/hy,Foxboron/hy,gilch/hy,larme/hy,farhaven/hy,paultag/hy,tuturto/hy,aisk/hy,farhaven/hy,aisk/hy,farhaven/hy,adamfeuer/hy,mtmiller/hy,freezas/hy,jakirkham/hy,aisk/hy,tianon/hy,kirbyfan64/hy,larme/hy,Foxboron/hy,algernon/hy,kartikm/hy,timmartin/hy,ALSchwalm/hy,larme/hy