animegame/tests/Controller/UserControllerTest.php

<?php

namespace App\Tests\Controller;

use App\DataFixtures\UserFixtures;

class UserControllerTest extends RestTestBase
{
    /**
     * This test verifies that requesting
     */
    public function testRetrieveUser()
    {
        $this->createRequestBuilder()
            ->setMethod('GET')
            ->setUri('/api/users')
            ->setAcceptType('application/json')
            ->addServerParameter('HTTP_X-AUTH-TOKEN', UserFixtures::ADMIN_USER_REFERENCE)
            ->request();

        $response = $this->client->getResponse();

        $this->assertTrue(
            $response->headers->contains('Content-Type', 'application/json'),
            'the "Content-Type" header is "' . $response->headers->get('Content-Type') . '"' // optional message shown on failure
        );

        $this->assertEquals(200, $response->getStatusCode(), 'Status code was ' . $response->getStatusCode() . ' but expected 200: ' . $response->getContent());
    }

}