public function testToStringTypeAlwaysUsesContentTypeHeader()
{
$response = new Response();
$response->headers('Content-Type', 'text/html');
$expected = "HTTP/1.1 200 OK\r\nContent-Type: text/html;charset=UTF-8\r\n\r\n";
$result = (string) $response;
$this->assertEqual($expected, $result);
$response = new Response();
$response->headers('Content-Type', 'text/plain');
$expected = "HTTP/1.1 200 OK\r\nContent-Type: text/plain;charset=UTF-8\r\n\r\n";
$result = (string) $response;
$this->assertEqual($expected, $result);
}