function testMicrotime()
{
$now = "2028-08-29 17:28:49";
$unix = \strtotime($now);
TimeMachine::setNow($now, 200);
$this->assertEquals($unix + 0.2, round(microtime(true), 3));
usleep(200 * 1000 + 200);
$this->assertEquals($unix + 0.4, round(microtime(true), 2));
TimeMachine::freeze();
$now = microtime(true);
usleep(200 * 1000);
$this->assertEquals($now, microtime(true));
$realNow = \microtime();
$realNowParts = explode(" ", $realNow);
TimeMachine::setNow(doubleval(doubleval($realNowParts[1]) + doubleval($realNowParts[0])));
$now = microtime();
$nowParts = explode(" ", $now);
$this->assertEquals($realNowParts[1], $nowParts[1]);
//we have to round the first part because double is not precise enough :-(
$this->assertEquals(round($realNowParts[0], 4), round($nowParts[0], 4));
TimeMachine::unfreeze();
}
