public function contentCanBeSetAppendedAndRetrieved()
{
$response = new Response();
$response->setContent('Two households, both alike in dignity, ');
$response->appendContent('In fair Verona, where we lay our scene');
$this->assertEquals('Two households, both alike in dignity, In fair Verona, where we lay our scene', $response->getContent());
$response->setContent('For never was a story of more woe, Than this of Juliet and her Romeo.');
$this->assertEquals('For never was a story of more woe, Than this of Juliet and her Romeo.', $response->getContent());
$this->assertEquals('For never was a story of more woe, Than this of Juliet and her Romeo.', (string) $response);
}