@Test
    public void insertTest(){
        long start = System.currentTimeMillis();
        for  (int i = 0; i < 100000; i++){
            heap.insert(i);
        }
        long end = System.currentTimeMillis();
        System.out.println("Time spent inserting 100 000: " + (end-start)*1.0 + "ms.");
        
        long deleteStart = System.currentTimeMillis();
        for (int i = 0; i < 100000; i++){
            heap.extract_min();
        }
        long deleteEnd = System.currentTimeMillis();
        System.out.println("Time spent deleting 100 000: " + (deleteEnd-deleteStart)*1.0 + "ms.");
    }