class RequirementsTest

class RequirementsTest extends BrowserTestBase {
  
  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'mysql',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    // The isolation_level option is only available for MySQL.
    $connectionInfo = Database::getConnectionInfo();
    if ($connectionInfo['default']['driver'] !== 'mysql') {
      $this->markTestSkipped("This test does not support the {$connectionInfo['default']['driver']} database driver.");
    }
  }
  
  /**
   * Test the isolation level warning message on status page.
   */
  public function testIsolationLevelWarningNotDisplaying() {
    $admin_user = $this->drupalCreateUser([
      'administer site configuration',
      'access site reports',
    ]);
    $this->drupalLogin($admin_user);
    // Set the isolation level to a level that produces a warning.
    $this->writeIsolationLevelSettings('REPEATABLE READ');
    // Check the message is not a warning.
    $this->drupalGet('admin/reports/status');
    $elements = $this->xpath('//details[@class="system-status-report__entry"]//div[contains(text(), :text)]', [
      ':text' => 'For the best performance and to minimize locking issues, the READ-COMMITTED',
    ]);
    $this->assertCount(1, $elements);
    $this->assertStringStartsWith('REPEATABLE-READ', $elements[0]->getParent()
      ->getText());
    // Ensure it is a warning.
    $this->assertStringContainsString('warning', $elements[0]->getParent()
      ->getParent()
      ->find('css', 'summary')
      ->getAttribute('class'));
    // Rollback the isolation level to read committed.
    $this->writeIsolationLevelSettings('READ COMMITTED');
    // Check the message is not a warning.
    $this->drupalGet('admin/reports/status');
    $elements = $this->xpath('//details[@class="system-status-report__entry"]//div[contains(text(), :text)]', [
      ':text' => 'For the best performance and to minimize locking issues, the READ-COMMITTED',
    ]);
    $this->assertCount(1, $elements);
    $this->assertStringStartsWith('READ-COMMITTED', $elements[0]->getParent()
      ->getText());
    // Ensure it is a not a warning.
    $this->assertStringNotContainsString('warning', $elements[0]->getParent()
      ->getParent()
      ->find('css', 'summary')
      ->getAttribute('class'));
  }
  
  /**
   * Writes the isolation level in settings.php.
   *
   * @param string $isolation_level
   *   The isolation level.
   */
  private function writeIsolationLevelSettings(string $isolation_level) {
    $settings['databases']['default']['default']['init_commands'] = (object) [
      'value' => [
        'isolation' => "SET SESSION TRANSACTION ISOLATION LEVEL {$isolation_level}",
      ],
      'required' => TRUE,
    ];
    $this->writeSettings($settings);
  }

}