python runtime_error ai_generated true

pytest.PytestUnraisableExceptionWarning: Exception ignored in: <sqlite3.Connection object>

ID: python/pytest-random-order-fixture-collision

Also available as: JSON · Markdown · 中文
80%Fix Rate
84%Confidence
0Evidence
2025-12-14First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.15.x active — — —

Root Cause

pytest-randomly reorders tests; a fixture that relied on side effects from a previously-run test (implicit ordering) now runs first, leaving resources in an unexpected state and triggering unraisable exceptions at GC.

generic

中文

pytest-randomly 重排测试；依赖先前测试副作用的 fixture（隐式顺序）现在最先运行，资源处于意外状态，GC 时触发不可抛出异常。

Workarounds

  1. 93% success 
    @pytest.fixture
def db(tmp_path):
    p = tmp_path / 'test.db'
    conn = sqlite3.connect(p)
    conn.executescript(SCHEMA)
    yield conn
    conn.close()
  2. 85% success 
    pytest --randomly-seed=last -x -q
# Reproduce, then refactor fixtures to remove cross-test state

Dead Ends

Common approaches that don't work:

  1. 75% fail

    Hides the ordering bug; CI with a different seed will still fail, and the fixture remains order-dependent.

  2. 70% fail

    Makes local runs deterministic but the underlying implicit dependency remains; any seed change re-exposes the bug.