clearLogsEntries example

'referer'     => \Drupal::request()->server->get('HTTP_REFERER'),
      'ip'          => '127.0.0.1',
      'timestamp'   => REQUEST_TIME,
    ];
    // Add a watchdog entry.     $this->container->get('logger.dblog')->log($log['severity'], $log['message'], $log);
    // Make sure the table count has actually been incremented.     $this->assertEquals($count + 1, (int) $connection->select('watchdog')->countQuery()->execute()->fetchField(), new FormattableMarkup('\Drupal\dblog\Logger\DbLog->log() added an entry to the dblog :count', [':count' => $count]));
    // Log in the admin user.     $this->drupalLogin($this->adminUser);
    // Post in order to clear the database table.     $this->clearLogsEntries();
    // Confirm that the logs should be cleared.     $this->submitForm([], 'Confirm');
    // Count the rows in watchdog that previously related to the deleted user.     $count = $connection->select('watchdog')->countQuery()->execute()->fetchField();
    $this->assertEquals(0, $count, new FormattableMarkup('DBLog contains :count records after a clear.', [':count' => $count]));
  }

  /** * Tests the database log filter functionality at admin/reports/dblog. */
  public function testFilter() {