conftest.py

import os
import sys
import pytest
from pathlib import Path

from snakemake.common import ON_WINDOWS
from snakemake.utils import find_bash_on_windows
from snakemake import shell

skip_on_windows = pytest.mark.skipif(ON_WINDOWS, reason="Unix stuff")
only_on_windows = pytest.mark.skipif(not ON_WINDOWS, reason="Windows stuff")
needs_strace = pytest.mark.xfail(
    os.system("strace -o /dev/null true") != 0, reason="Missing strace"
)


@pytest.fixture(autouse=True)
def reset_paths_between_tests():
    """Ensure that changes to sys.path are reset between tests"""
    org_path = sys.path.copy()
    yield
    sys.path = org_path


bash_cmd = find_bash_on_windows()

if ON_WINDOWS and bash_cmd:

    @pytest.fixture(autouse=True)
    def prepend_usable_bash_to_path(monkeypatch):
        monkeypatch.setenv("PATH", os.path.dirname(bash_cmd), prepend=os.pathsep)

    @pytest.fixture(autouse=True)
    def reset_shell_exec_on_windows(prepend_usable_bash_to_path):
        shell.executable(None)