python data_error ai_generated true

AssertionError: assert 'expected log' in ''

ID: python/pytest-caplog-no-output

Also available as: JSON · Markdown · 中文
80%Fix Rate
86%Confidence
0Evidence
2024-04-11First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
7.x active — — —
8.x active — — —

Root Cause

The logger's level is higher than the message level, or logging was configured with propagate=False, so caplog does not capture the record. caplog defaults to WARNING.

generic

中文

logger 的级别高于消息级别，或 logging 配置了 propagate=False，导致 caplog 无法捕获记录。caplog 默认级别为 WARNING。

Workarounds

  1. 93% success 
    def test_logs(caplog):
    caplog.set_level(logging.INFO, logger='app')
    do_work()
    assert 'expected log' in caplog.text

# app/logger.py
logger = logging.getLogger('app')
logger.propagate = True
  2. 90% success 
    def test_logs(caplog):
    caplog.set_level(logging.INFO)
    do_work()
    assert any(r.message == 'expected log' for r in caplog.records)

Dead Ends

Common approaches that don't work:

  1. 70% fail

    -s disables output capture, which actually makes caplog less likely to see logs from some handlers.

  2. 65% fail

    May add a handler but caplog still relies on propagation and its own level; often ineffective.