How to use the watchmaker.logger._configure_ec2_launch_event_log function in watchmaker

"""Check that EC2Launch Event Log config skips pre-existing events."""
    # Load all event types into the data
    events = []
    for msg_type in logger.MESSAGE_TYPES:
        events += [{
            'logName': 'Application',
            'source': 'Watchmaker',
            'level': msg_type,
            'numEntries': '999'
        }]
    data = json.dumps({'events': events})

    mo_ = mocker.mock_open(read_data=data)
    mocker.patch('io.open', mo_, create=True)

    logger._configure_ec2_launch_event_log()

    # Verify we read the data
    assert mo_.call_args_list == [
        mocker.call(logger.EC2_LAUNCH_LOG_CONFIG),
    ]

    # Verify we didn't write anything
    handle = mo_()
    assert handle.write.call_count == 0

def test_configure_ec2_launch_event_log_raises_filenotfound(mocker):
    """Raise FileNotFoundError when EC2_LAUNCH_LOG_CONFIG is missing."""
    logger.EC2_LAUNCH_LOG_CONFIG = 'notreal.json'

    with pytest.raises(FileNotFoundError):
        logger._configure_ec2_launch_event_log()

def test_configure_ec2launch_write_all_events(mocker):
    """Configure EC2Launch Event Logging with all events."""
    # Start with an empty data set, so all events should be written
    data = '{}'

    mo_ = mocker.mock_open(read_data=data)
    mocker.patch('io.open', mo_, create=True)

    logger._configure_ec2_launch_event_log()

    # Verify we opened the file twice, once for read and once for write
    assert mo_.call_args_list == [
        mocker.call(logger.EC2_LAUNCH_LOG_CONFIG),
        mocker.call(logger.EC2_LAUNCH_LOG_CONFIG, mode='w')
    ]

    # Convert write calls to json
    handle = mo_()
    result = json.loads(
        _pytest_stringify_write_calls(handle.write.call_args_list))

    expected_events = []
    for msg_type in logger.MESSAGE_TYPES:
        expected_events += [{
            'logName': 'Application',