test_ok2/testing/test_meta.py

import pkgutil
import subprocess
import sys

import _pytest
import pytest


def _modules():
    return sorted(
        n
        for _, n, _ in pkgutil.walk_packages(
            _pytest.__path__, prefix=_pytest.__name__ + "."
        )
    )


@pytest.mark.slow
@pytest.mark.parametrize("module", _modules())
def test_no_warnings(module):
    # fmt: off
    subprocess.check_call((
        sys.executable,
        "-W", "error",
        # https://github.com/pytest-dev/pytest/issues/5901
        "-W", "ignore:The usage of `cmp` is deprecated and will be removed on or after 2021-06-01.  Please use `eq` and `order` instead.:DeprecationWarning",  # noqa: E501
        "-c", "import {}".format(module),
    ))
    # fmt: on