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Capture

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Reference:docs.pytest.org

Capturing logs ​

Use the fixture caplog.

Make sure logger.propagate = True.

python
def test_logging(caplog):
  run_stuff()
  assert 'Log message content' in caplog.text

Capturing stdout and stderr ​

Use the fixture capsys.

The return value from readouterr is a namedtuple with two attributes, out and err.

python
def test_logging(capsys):
  run_stuff()
  captured = capsys.readouterr()
  assert 'Output' in captured.out
  assert 'Error' in captured.err