unit test for silex controller

TddControllerTest.php

<?php

use pl\tddcontroller\TddController;
use PHPUnit\Framework\TestCase;
use Symfony\Component\HttpFoundation\JsonResponse;

class TddControllerTest extends TestCase
{
    /** @var  TddController */
    private $controller;

    /** @var string */
    private $charset = 'UTF-8';

    public function setUp()
    {
        $this->controller = new TddController(
            $this->charset
        );
    }

    public function testGetCity()
    {
        $cityId = 583737;
        $expected = '"' . $cityId . $this->charset . '"';

        /** @var JsonResponse $jsonResponse */
        $jsonResponse = $this->controller->get($cityId);

        $this->assertEquals($expected, $jsonResponse->getContent());
    }

    public function testCitiesWithQueryString()
    {
        $queryString = ['returnsecondvalue' => 'true'];
        $expected = '"value2' . $this->charset . '"';
        $jsonResponse = $this->controller->getAll($queryString);

        $this->assertEquals(
            $expected,
            $jsonResponse->getContent()
        );
    }

    public function testCitiesWithQueryStringNotTrue()
    {
        $queryString = ['returnsecondvalue' => 'false'];
        $expected = '"value1' . $this->charset . '"';

        $jsonResponse = $this->controller->getAll($queryString);

        $this->assertEquals(
            $expected,
            $jsonResponse->getContent()
        );
    }

    public function testCitiesWithOutQueryString()
    {
        $queryString = [];
        $expected = '"value1' . $this->charset . '"';

        $jsonResponse = $this->controller->getAll($queryString);

        $this->assertEquals(
            $expected,
            $jsonResponse->getContent()
        );
    }

}