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if present and not self.match():
    log.error(f"Log output: \n{self.watcher_process.stdout.getvalue()}\n")
    raise AssertionError(f"Expected log message found: '{expected_pattern}'")
elif fail or (not present and self.match()):
    log.error(f"Log output: \n{self.watcher_process.stdout.getvalue()}\n")
    raise AssertionError(f"Unexpected log message found: '{expected_pattern}'")

above code [0] is a bit erroneous since it says 'Expected log message found' if the expected_pattern is expected to be present but the match is not found. Not a major thing; just a addition of 'not' and we are good to go

[0] https://github.com/ceph/ceph/blob/main/qa/tasks/ceph_test_case.py#L256-L261