"""Test bootstrap: make the ``src`` layout importable.

This is used by pytest.  When running with the standard library test runner,
pass the source tree explicitly, e.g.::

    PYTHONPATH=src python3 -m unittest discover -s tests -t tests
"""

from __future__ import annotations

import sys
from pathlib import Path

_SRC = Path(__file__).resolve().parents[1] / "src"
if str(_SRC) not in sys.path:
    sys.path.insert(0, str(_SRC))