Connection.php

<?php

namespace Drupal\Driver\Database\fake;

use Drupal\Core\Database\Connection as CoreConnection;
use Drupal\Core\Database\StatementEmpty;

/**
 * A fake Connection class for testing purposes.
 */
class Connection extends CoreConnection {
    
    /**
     * Public property so we can test driver loading mechanism.
     *
     * @var string
     * @see driver().
     */
    public $driver = 'fake';
    
    /**
     * {@inheritdoc}
     */
    public function queryRange($query, $from, $count, array $args = [], array $options = []) {
        return new StatementEmpty();
    }
    
    /**
     * {@inheritdoc}
     */
    public function queryTemporary($query, array $args = [], array $options = []) {
        return '';
    }
    
    /**
     * {@inheritdoc}
     */
    public function driver() {
        return $this->driver;
    }
    
    /**
     * {@inheritdoc}
     */
    public function databaseType() {
        return 'fake';
    }
    
    /**
     * {@inheritdoc}
     */
    public function createDatabase($database) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function mapConditionOperator($operator) {
        return NULL;
    }
    
    /**
     * {@inheritdoc}
     */
    public function nextId($existing_id = 0) {
        return 0;
    }

}