public function testContentNegotiation()
{
$this->app->get("/", function () {
return new Response("hello from controller");
});
$req = Request::create("/");
$req->headers->add(['Accept' => 'application/json']);
$app = $this->app->builder->resolve($this->app);
$app->handle($req);
$header = $req->attributes->get("_accept");
$this->assertInstanceOf('Negotiation\\AcceptHeader', $header);
$this->assertEquals('application/json', $header->getValue());
}
