1--TEST-- 2Test usleep() function : error conditions 3--FILE-- 4<?php 5 6usleep(-10); 7 8?> 9--EXPECTF-- 10Fatal error: Uncaught ValueError: usleep(): Argument #1 ($microseconds) must be greater than or equal to 0 in %s:%d 11Stack trace: 12#0 %s(%d): usleep(-10) 13#1 {main} 14 thrown in %s on line %d 15