public function testTextHeaders()
{
$received_header = null;
$this->response->addEventHandler(Response::HEADER_ADDED_EVENT, function (Response $response, $header) use(&$received_header) {
$received_header = $header;
});
$this->response->setResponseType(Response::TEXT);
$this->response->render();
$this->assertTrue($this->response->isText());
$this->assertSame('Content-Type: text/plain', $received_header);
}
