public function testIsCurrent_False()
{
$current = Process::current();
$logFile = $this->_logFile;
$child = Process::fork(function () use($current, $logFile) {
\file_put_contents($logFile, $current->isCurrent() ? 'yes' : 'no');
});
$st = 0;
$wpid = \pcntl_wait($st);
$this->assertEquals('no', \file_get_contents($this->_logFile));
}