# test_markers.py
import pytest
@pytest.mark.slow
def test_something_slow():
# test implementation
@pytest.mark.fast
def test_something_fast():
# test implementation
@pytest.mark.skip(reason="Test not implemented yet")
def test_something_skipped():
pass
# run_tests.py
import pytest
pytest.main(["-m", "slow", "test_markers.py"])