public function testDifference()
{
$start = Timer::getMicroTime();
$diff = 0.04525;
$epsilon = 0.0001;
$end = $start + $diff;
$this->assertInternalType('float', Timer::difference($start, $end));
$this->assertTrue(abs(Timer::difference($start, $end) - $diff) < $epsilon);
// test precision
foreach (array(0, 1, 2, 5, 8, 10, 20) as $precision) {
$difference = Timer::difference($start, $end, $precision);
$diffArray = explode('.', strval($difference));
if (count($diffArray) === 2) {
$this->assertTrue(strlen(end($diffArray)) <= $precision, 'Failed asserting proper precision length for precision of ' . $precision . ' (' . $difference . ' given).');
}
}
}
