How to use the mirakuru.TCPExecutor.pre_start_check function in mirakuru

def test_default_port():
    """
    Test default port for the base TCP check.

    Check if HTTP executor fills in the default port for the TCP check
    from the base class if no port is provided in the URL.
    """
    executor = HTTPExecutor(HTTP_NORMAL_CMD, 'http://{0}/'.format(HOST))

    assert executor.url.port is None
    assert executor.port == PORT

    assert TCPExecutor.pre_start_check(executor) is False
    executor.start()
    assert TCPExecutor.pre_start_check(executor) is True
    executor.stop()