public function testSetInterval()
{
$et = new ET();
$output = [];
$interval = $et->setInterval(function ($e) use(&$output) {
$output[] = 'one';
}, 0.01);
for ($i = 0; $i < 10; $i++) {
usleep(10000);
$et->tick();
}
$this->assertSame($output, array_fill(0, 10, 'one'));
// remove the interval - nothing should happen
$et->removeInterval($interval);
for ($i = 0; $i < 10; $i++) {
usleep(10000);
$et->tick();
}
$this->assertSame($output, array_fill(0, 10, 'one'));
}