Issue #3366862 by mondrake, daffie: Refactor...

    // Assert that in the settings.php the database connection array has the

    // correct values set.

    $contents = file_get_contents($this->container->getParameter('app.root') . '/' . $this->siteDirectory . '/settings.php');

    $this->assertStringContainsString("'namespace' => 'Drupal\\\\driver_test\\\\Driver\\\\Database\\\\{$this->testDriverName}',", $contents);

    $this->assertStringContainsString("'driver' => '{$this->testDriverName}',", $contents);

    $this->assertStringContainsString("'autoload' => 'core/modules/system/tests/modules/driver_test/src/Driver/Database/{$this->testDriverName}/',", $contents);

    $dependencies = "'dependencies' => " . PHP_EOL .

      "  array (" . PHP_EOL .

      "    'mysql' => " . PHP_EOL .

      "    array (" . PHP_EOL .

      "      'namespace' => 'Drupal\\\\mysql'," . PHP_EOL .

      "      'autoload' => 'core/modules/mysql/src/'," . PHP_EOL .

      "    )," . PHP_EOL .

      "    'pgsql' => " . PHP_EOL .

      "    array (" . PHP_EOL .

      "      'namespace' => 'Drupal\\\\pgsql'," . PHP_EOL .

      "      'autoload' => 'core/modules/pgsql/src/'," . PHP_EOL .

      "    )," . PHP_EOL .

      "  )," . PHP_EOL;

    $this->assertStringContainsString($dependencies, $contents);

    $installedDatabaseSettings = $this->getInstalledDatabaseSettings();

    $this->assertSame("Drupal\\driver_test\\Driver\\Database\\{$this->testDriverName}", $installedDatabaseSettings['default']['default']['namespace']);

    $this->assertSame($this->testDriverName, $installedDatabaseSettings['default']['default']['driver']);

    $this->assertSame("core/modules/system/tests/modules/driver_test/src/Driver/Database/{$this->testDriverName}/", $installedDatabaseSettings['default']['default']['autoload']);

    $this->assertEquals([

      'mysql' => [

        'namespace' => 'Drupal\\mysql',

        'autoload' => 'core/modules/mysql/src/',

      ],

      'pgsql' => [

        'namespace' => 'Drupal\\pgsql',

        'autoload' => 'core/modules/pgsql/src/',

      ],

    ], $installedDatabaseSettings['default']['default']['dependencies']);

    // Assert that the module "driver_test" has been installed.

    $this->assertEquals(\Drupal::service('module_handler')->getModule('driver_test'), new Extension($this->root, 'module', 'core/modules/system/tests/modules/driver_test/driver_test.info.yml'));

    Database::addConnectionInfo('default', 'default', $connection_info['default']);

  }

  /**

   * Returns the databases setup from the SUT's settings.php.

   *

   * @return array<string,mixed>

   *   The value of the $databases variable.

   */

  protected function getInstalledDatabaseSettings(): array {

    // The $app_root and $site_path variables are required by the settings.php

    // file to be parsed correctly. The $databases variable is set in the

    // included file, we need to inform PHPStan about that since PHPStan itself

    // is unable to determine it.

    $app_root = $this->container->getParameter('app.root');

    $site_path = $this->siteDirectory;

    include $app_root . '/' . $site_path . '/settings.php';

    assert(isset($databases));

    return $databases;

  }

}