Retrieves a scheme validator object
function test()
{
generate_mock_once('HTMLPurifier_URIScheme');
$config = HTMLPurifier_Config::create(array('URI.AllowedSchemes' => 'http, telnet', 'URI.OverrideAllowedSchemes' => true));
$context = new HTMLPurifier_Context();
$registry = new HTMLPurifier_URISchemeRegistry();
$this->assertIsA($registry->getScheme('http', $config, $context), 'HTMLPurifier_URIScheme_http');
$scheme_http = new HTMLPurifier_URISchemeMock();
$scheme_telnet = new HTMLPurifier_URISchemeMock();
$scheme_foobar = new HTMLPurifier_URISchemeMock();
// register a new scheme
$registry->register('telnet', $scheme_telnet);
$this->assertIdentical($registry->getScheme('telnet', $config, $context), $scheme_telnet);
// overload a scheme, this is FINAL (forget about defaults)
$registry->register('http', $scheme_http);
$this->assertIdentical($registry->getScheme('http', $config, $context), $scheme_http);
// when we register a scheme, it's automatically allowed
$registry->register('foobar', $scheme_foobar);
$this->assertIdentical($registry->getScheme('foobar', $config, $context), $scheme_foobar);
// now, test when overriding is not allowed
$config = HTMLPurifier_Config::create(array('URI.AllowedSchemes' => 'http, telnet', 'URI.OverrideAllowedSchemes' => false));
$this->assertNull($registry->getScheme('foobar', $config, $context));
// scheme not allowed and never registered
$this->assertNull($registry->getScheme('ftp', $config, $context));
}
