public function testIsRegistered()
{
if (in_array(Stream::PROTOCOL, stream_get_wrappers())) {
Stream::unregister();
}
$this->assertFalse(in_array(Stream::PROTOCOL, stream_get_wrappers()));
$this->assertFalse(Stream::isRegistered());
//
Stream::register();
$this->assertTrue(in_array(Stream::PROTOCOL, stream_get_wrappers()));
$this->assertTrue(Stream::isRegistered());
}