Pytest capture not working - caplog and capsys are empty

问题

I am trying to create unit tests for a logger, but - even though the events are logged - the caplog and capsys remain empty.

What am I doing wrong?

回答1:

It turned out that my logger had property propagate set to False. As a result, the events were not forwarded to LogCaptureHandler added by pytest to the root logger.

Both caplog and capsys depend on LogCaptureHandler receiving the propagated events.

来源：https://stackoverflow.com/questions/61702794/pytest-capture-not-working-caplog-and-capsys-are-empty