public function testOAuthClientDoesntOverrideExistingHeaders()
{
$mock = $this->getMock('ZendOAuth\\Http\\Utility', array('generateTimestamp', 'generateNonce'));
$mock->expects($this->once())->method('generateTimestamp')->will($this->returnValue('123456789'));
$mock->expects($this->once())->method('generateNonce')->will($this->returnValue('67648c83ba9a7de429bd1b773fb96091'));
$token = new Token\Access(null, $mock);
$token->setToken('123')->setTokenSecret('456');
$client = new OAuthClient(array('token' => $token), 'http://www.example.com');
$dummyHeader = Header\ContentType::fromString('Content-Type: application/octet-stream');
$headers = $client->getRequest()->getHeaders();
$headers->addHeaders(array($dummyHeader));
$client->prepareOAuth();
$this->assertTrue($client->getRequest()->getHeaders()->has('Content-Type'));
$this->assertEquals($dummyHeader, $client->getRequest()->getHeaders()->get('Content-Type'));
}
