Additional asset to validate that the interval has been changed

Author: lucasnetau

tests/Timer/AbstractTimerTest.php

@@ -130,6 +130,8 @@ public function testAddPeriodicTimerWithZeroIntervalWillBeInvokedWithMaximumAccu
             ++$i;
         });
 
+        $this->assertEquals($periodic::MIN_INTERVAL, $periodic->getInterval());
+
         $loop->addTimer(0.001, function () use ($loop, $periodic) {
             $loop->cancelTimer($periodic);
         });