public function testConvertsGuzzleHeadersToArrays()
{
$guzzle = $this->getGuzzle([new GuzzleResponse(200, array('Date' => 'Tue, 04 Jun 2013 13:22:41 GMT'))]);
$client = new Client();
$client->setClient($guzzle);
$client->request('GET', 'http://www.example.com/');
$response = $client->getResponse();
$headers = $response->getHeaders();
$this->assertInternalType('array', array_shift($headers), 'Header not converted from Guzzle\\Http\\Message\\Header to array');
}