pytest_verbose_parametrize.py

from collections import Iterable
from six import string_types


def _strize_arg(arg):
    try:
        s = arg.__name__
    except AttributeError:
        s = str(arg)
    if len(s) > 32:
        s = s[:29] + '...'
    return s


def pytest_generate_tests(metafunc):
    try:
        markers = metafunc.function.parametrize
    except AttributeError:
        return
    if 'ids' not in markers.kwargs:
        list_names = []
        for i, argvalue in enumerate(markers.args[1]):
            if (not isinstance(argvalue, Iterable)) or isinstance(argvalue, string_types):
                argvalue = (argvalue,)
            name = '-'.join(_strize_arg(arg) for arg in argvalue)
            if len(name) > 64:
                name = name[:61] + '...'
            while name in list_names:
                name = '%s#%d' % (name, i)
            list_names.append(name)
        markers.kwargs['ids'] = list_names
        # In pytest versions pre-3.1.0 MarkInfo copies the
        # kwargs into an internal variable as well :/
        if hasattr(markers, '_arglist'):
            markers._arglist[0][-1]['ids'] = list_names