DriverSpecificKernelTestBase.php

<?php

declare (strict_types=1);
namespace Drupal\KernelTests\Core\Database;

use Drupal\Core\Database\Connection;
use Drupal\Core\Database\Database;
use Drupal\KernelTests\KernelTestBase;

/**
 * Base class for driver specific kernel tests.
 *
 * Driver specific tests should be created in the
 * \Drupal\Tests\my_module\Kernel\my_driver namespace, and their execution will
 * only occur when the database driver of the SUT is provided by 'my_module' and
 * named 'my_driver'.
 */
abstract class DriverSpecificKernelTestBase extends KernelTestBase {
    
    /**
     * The database connection for testing.
     */
    protected Connection $connection;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        // Find the current SUT database driver from the connection info. If that
        // is not the one the test requires, skip before test database
        // initialization so to save cycles.
        $this->root = static::getDrupalRoot();
        chdir($this->root);
        $connectionInfo = $this->getDatabaseConnectionInfo();
        $test_class_parts = explode('\\', get_class($this));
        $expected_provider = $test_class_parts[2] ?? '';
        for ($i = 3; $i < count($test_class_parts); $i++) {
            if ($test_class_parts[$i] === 'Kernel') {
                $expected_driver = $test_class_parts[$i + 1] ?? '';
                break;
            }
        }
        if ($connectionInfo['default']['driver'] !== $expected_driver) {
            $this->markTestSkipped("This test only runs for the database driver '{$expected_driver}'. Current database driver is '{$connectionInfo['default']['driver']}'.");
        }
        parent::setUp();
        $this->connection = Database::getConnection();
        // After database initialization, the database driver may be not provided
        // by the expected module; skip test in that case.
        $running_provider = $this->connection
            ->getProvider();
        $running_driver = $this->connection
            ->driver();
        if ($running_provider !== $expected_provider || $running_driver !== $expected_driver) {
            $this->markTestSkipped("This test only runs for the database driver '{$expected_driver}' provided by the '{$expected_provider}' module. Connected database driver is '{$running_driver}' provided by '{$running_provider}'.");
        }
    }

}