def METHOD_NAME():
    properties = Properties()
    assert properties.user_id is None
    properties = Properties()
    properties = properties._replace(user_id=b'')
    assert properties.user_id == b''
    properties = Properties()
    properties = properties._replace(user_id=b'1')
    assert properties.user_id == b'1'
    properties = Properties()
    properties = properties._replace(user_id=b'short')
    assert properties.user_id == b'short'
    properties = Properties()
    properties = properties._replace(user_id=b'longuseridstring')
    assert properties.user_id == b'longuseridstring'
    properties = Properties()
    properties = properties._replace(user_id=b'!@#$%^&*()_+1234567890')
    assert properties.user_id == b'!@#$%^&*()_+1234567890'
    properties = Properties()
    properties = properties._replace(user_id=b'werid/0\0\1\t\n')
    assert properties.user_id == b'werid/0\0\1\t\n'