Does this tool execute test code or require a Python runtime?

No. The analyzer performs purely static source code parsing without running tests or importing modules.

How do I analyze multiple conftest.py files simultaneously?

Separate each file in the source input using '# --- file: path/to/conftest.py ---' header markers.

Why is using monkeypatch in a module or session fixture flagged?

monkeypatch is function-scoped, so its teardown never runs in broad fixtures, causing patches to leak across tests.

What triggers a ScopeMismatch error in pytest?

A ScopeMismatch occurs when a broader fixture such as session or module depends on a narrower fixture like function.

What mock.patch issues does the analyzer detect?

It detects patcher.start() calls without corresponding .stop() calls and flags with mock.patch held open across yields.

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pytest conftest Fixture Dependency Graph & mock.patch Leak Detector

Statically analyze a pytest conftest.py chain: render the fixture dependency graph across all five scopes (function/class/module/package/session), detect deeper-conftest overrides, ScopeMismatch edges, and cross-test state pollution — mock.patch().start() without .stop(), monkeypatch leaking from broad-scope fixtures, and with mock.patch held open across yield.

Details

What this tool helps you do

Paste one or more conftest.py / test files separated by '# --- file: path ---' markers (or upload a .py). The analyzer implements pytest's documented fixture semantics: scope ordering session > package > module > class > function, ScopeMismatch when a broad fixture depends on a narrower one, and test-outward name resolution where the deepest conftest wins. Leak rules: monkeypatch/capsys/tmp_path are function-scoped built-ins whose undo never runs inside a module/session fixture (patches bleed across the session, pytest-mock issue #84 class of bug); patcher.start() without .stop() survives until process exit; a with mock.patch(…) wrapping a yield keeps every test on the patched target. Output: severity-ranked findings, a fixture inventory table and a scope-layered dependency SVG graph.

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# --- file: conftest.py --- import pytest from unittest import mock @pytest.fixture(scope="session") def patched_auth(): patcher = mock.patch("auth.verify_token", return_value=True) patcher.start() return None # --- file: tests/unit/conftest.py --- import pytest @pytest.fixture(scope="module") def fake_auth(monkeypatch): monkeypatch.setattr("auth.verify_token", lambda t: True) return True

pytest conftest Fixture Dependency Graph & mock.patch Leak Detector

What this tool helps you do

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Examples that match this tool

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Key facts

Overview

When to use

How it works

Use cases

Examples

1. Detecting Session-Level Patch Leaks and Scope Mismatches

2. Auditing Broad-Scope Context Manager Yields

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