check_comprehensiveness breaks running a subset of tests

[TomAugspurger]

pandas/pandas/tests/indexing/test_coercion.py

Line 19 in b7294dd

def check_comprehensiveness(request):

so I can't run, e.g. pytest pandas/tests/indexing/test_coercion.py::TestFillnaSeriesCoercion::test_fillna_datetime64tz, which is a tad annoying. Can we rewrite the check to be aware of what was requested?