public function testAdditionalHeaderAddedToRequest()
{
$response = new MockSimpleHttpResponse();
$response->returnsByReference('getHeaders', new MockSimpleHttpHeaders());
$request = new MockSimpleHttpRequest();
$request->returnsByReference('fetch', $response);
$request->expectOnce('addHeaderLine', array('User-Agent: SimpleTest'));
$agent = new MockRequestUserAgent();
$agent->returnsByReference('createHttpRequest', $request);
$agent->__construct();
$agent->addHeader('User-Agent: SimpleTest');
$response = $agent->fetchResponse(new SimpleUrl('http://this.host/'), new SimpleGetEncoding());
}
