<?php

namespace ...;


use MagentoEavSetupEavSetupFactory;
use MagentoFrameworkSetupInstallDataInterface;
use MagentoFrameworkSetupModuleContextInterface;
use MagentoFrameworkSetupModuleDataSetupInterface;

class InstallData implements InstallDataInterface
{
    /**
     * EAV setup factory
     *
     * @var EavSetupFactory
     */
    private $eavSetupFactory;

    /**
     * Init
     *
     * @param EavSetupFactory $eavSetupFactory
     */
    public function __construct(EavSetupFactory $eavSetupFactory)
    {
        $this->eavSetupFactory = $eavSetupFactory;
    }

    /**
     * {@inheritdoc}
     */
    public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
    {
        $setup->startSetup();


            $setup->getConnection()->query("INSERT INTO `sales_order_status`(`status`, `label`) VALUES ('test','Test')");



        $setup->endSetup();
    }
}

namespace {VendorName}{ModuleName}Setup;
use MagentoFrameworkConfigConfigOptionsListConstants;

class InstallSchema implements MagentoFrameworkSetupInstallSchemaInterface
{

    /**
     * @var MagentoFrameworkAppDeploymentConfig
     */
    protected $deploymentConfig;

    public function __construct(
        MagentoFrameworkAppDeploymentConfig  $deploymentConfig
    ) {

        $this->deploymentConfig = $deploymentConfig;
    }
    public function getTablePrefix()
    {
        return $this->deploymentConfig->get(
                ConfigOptionsListConstants::CONFIG_PATH_DB_PREFIX
            );
    }

namespace ...;


use MagentoEavSetupEavSetupFactory;
use MagentoFrameworkSetupInstallDataInterface;
use MagentoFrameworkSetupModuleContextInterface;
use MagentoFrameworkSetupModuleDataSetupInterface;

class InstallData implements InstallDataInterface
{
    /**
     * EAV setup factory
     *
     * @var EavSetupFactory
     */
private $eavSetupFactory;

/**
 * Init
 *
 * @param EavSetupFactory $eavSetupFactory
 */
public function __construct(EavSetupFactory $eavSetupFactory)
{
    $this->eavSetupFactory = $eavSetupFactory;
}

/**
 * {@inheritdoc}
 */
public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
{
    $setup->startSetup();
    $tableName = $setup->getTable('sales_order_status');

    $setup->getConnection()->query('INSERT INTO `'.$tableName.'` (`status`, `label`) VALUES ('test','Test')');
    $setup->endSetup();
}
}