python test/test_codegen.py
python test/test_codegen.py ConstantsTest.test_char
python setup.py test

or for debugging, mostly
clang2py --debug test/data/test-clangX.c

test/test_*.py are standard unittest mostly forked from the original ctypeslib.
only test_record.py test_fast_clang.py test_codegen.py have been worked on for now.
I do not know the state of the other tests.