basic silex controller for TDD

TddController.php

<?php
namespace pl\tddcontroller;

use Symfony\Component\HttpFoundation\JsonResponse;

class TddController
{
    /** @var string */
    private $charset;

    public function __construct(string $charset)
    {
        $this->charset = $charset;
    }

    public function get(int $id): JsonResponse
    {
        return new JsonResponse($id . $this->charset);
    }

    public function getAll(array $query): JsonResponse
    {
        $value = 'value1';

        if (isset($query['returnsecondvalue']) && $query['returnsecondvalue'] === "true") {
            $value = 'value2';
        }
        return new JsonResponse($value . $this->charset);
    }

}