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Copy pathtest_no_subprocess.py
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60 lines (41 loc) · 1.7 KB
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# -*- coding: utf-8 -*-
"""piptree must never spawn a process.
It runs inside JupyterLite/Pyodide, where process spawning does not exist.
This is the executable form of the rule stated in piptree's module docstring:
if someone makes PipData shell out to the target interpreter, these fail.
"""
import subprocess
import pytest
from wppm import piptree
from conftest import write_dist
class Spawned(Exception):
"""Raised instead of starting a process."""
@pytest.fixture
def no_spawn(monkeypatch):
def boom(*args, **kwargs):
raise Spawned("piptree must not spawn a process (it runs in Pyodide)")
for name in ("Popen", "run", "call", "check_call", "check_output"):
monkeypatch.setattr(subprocess, name, boom)
return boom
@pytest.fixture
def target(tmp_path):
root = tmp_path / "dist"
site = root / "Lib" / "site-packages"
site.mkdir(parents=True)
(root / "python.exe").write_bytes(b"MZ")
write_dist(site, "app", "1.0", summary="An app", requires=["lib"])
write_dist(site, "lib", "2.0", summary="A lib")
return root
def test_building_pipdata_spawns_nothing(no_spawn, target):
assert piptree.PipData(str(target)).distro
def test_pip_list_spawns_nothing(no_spawn, target):
pip = piptree.PipData(str(target))
assert len(pip.pip_list(full=True)) == 2
def test_dependency_trees_spawn_nothing(no_spawn, target):
pip = piptree.PipData(str(target))
assert "lib==2.0" in pip.down("app", "", 2)
assert "app==1.0" in pip.up("lib", "", 2)
def test_the_guard_itself_works(no_spawn):
"""Guard against a false negative: prove the patch really blocks spawning."""
with pytest.raises(Spawned):
subprocess.Popen(["cmd", "/c", "echo", "hi"])