How to hide output while using the pattern option

[patrick91]

Is there a way to hide all the ouput while using the pattern option? I've tried this:

class Starter(ProcessStarter):
    env = {"PYTHONUNBUFFERED": "1", **os.environ}
    pattern = BOOT_MSG
    popen_kwargs = {
        "stdout": subprocess.DEVNULL,
        "stderr": subprocess.STDOUT,
    }

but it breaks the pattern check :)

[northernSage]

Hey @patrick91. Yes, the code shown would naturally break pattern matching since you are effectively throwing away all process output so xprocess has nothing to match your pattern against. What output, specifically, would like to hide? Are you referring to pytest output? The output of the initialized process should be captured by pytest and should not show under normal circumstances (unless you disable all capture with -s flag). You can further customize pytest capturing with:

pytest -s                  # disable all capturing
pytest --capture=sys       # replace sys.stdout/stderr with in-mem files
pytest --capture=fd        # also point filedescriptors 1 and 2 to temp file
pytest --capture=tee-sys   # combines 'sys' and '-s', capturing sys.stdout/stderr
                           # and passing it along to the actual sys.stdout/stderr