function testAddWriteStream()
{
$h = fopen('php://temp', 'r+');
$loop = new Loop();
$loop->addWriteStream($h, function () use($h, $loop) {
fwrite($h, 'hello world');
$loop->removeWriteStream($h);
});
$loop->run();
rewind($h);
$this->assertEquals('hello world', stream_get_contents($h));
}
