public function testConstructAndCountAndGetAndSet() { $interval = new Interval([4, 18, 25, 42]); $this->assertTrue($interval->size() == 4); $this->assertTrue($interval->get(0) == 4); $this->assertTrue($interval->get(3) == 42); $interval->set(2, 40); $this->assertTrue($interval->get(2) == 40); }