function testUpdateIntervalDays()
{
$name = "Meditate";
$motivation = "Clarity";
$interval_days = 3;
$id = 4;
$completed = False;
$test_habit = new Habit($name, $motivation, $interval_days, $completed, $id);
$test_habit->save();
$new_interval_days = 12;
$result = $test_habit->updateIntervalDays($new_interval_days);
$this->assertEquals(12, $test_habit->getIntervalDays());
}
