def METHOD_NAME():
    client = boto3.client("rds", region_name="us-west-2")
    source_arn = _prepare_db_snapshot(client)
    client.start_export_task(
        ExportTaskIdentifier="export-snapshot-1",
        SourceArn=source_arn,
        S3BucketName="export-bucket",
        IamRoleArn="",
        KmsKeyId="",
    )
    exports = client.describe_export_tasks().get("ExportTasks")
    assert len(exports) == 1
    assert exports[0]["ExportTaskIdentifier"] == "export-snapshot-1"