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import pytest


def pytest_addoption(parser):
    parser.addoption("--runslow", action="store_true", default=False, help="Run thorough, but much slower, tests")


def pytest_collection_modifyitems(config, items):
    if config.getoption("--runslow"):
        return

    skip_slow = pytest.mark.skip(reason="Skipping slow test without --runslow option")
    for item in items:
        if "slow" in item.keywords:
            item.add_marker(skip_slow)


def pytest_ignore_collect(path, config):
    if config.getoption("--runslow"):
        return False
    else:
        return str(path).endswith('_slow.py')
