public function testSendReturnAssoc()
{
$request = new SpotifyWebAPI\Request();
$request->setReturnAssoc(true);
$response = $request->send('GET', 'https://api.spotify.com/v1/albums/7u6zL7kqpgLPISZYXNTgYk');
$this->assertArrayHasKey('id', $response['body']);
}