function testRequireAuth()
{
$request = new HTTP\Request();
$response = new HTTP\Response();
$backend = new AbstractDigestMock();
$backend->setRealm('writing unittests on a saturday night');
$backend->challenge($request, $response);
$this->assertStringStartsWith('Digest realm="writing unittests on a saturday night"', $response->getHeader('WWW-Authenticate'));
}
