}
	}

	// Make sure that the numbers are popped in ascending order.
	prevNum := 0
	for i := 0; i < amount; i++ {
		obj, err := h.Pop()
		num := obj.(testHeapObject).val.(int)
		// All the items must be sorted.
		if err != nil || prevNum > num {
			t.Errorf("got %v out of order, last was %v", obj, prevNum)
		}
		prevNum = num
	}
}

	// util[0].Time and end.
	muInWindow := func(util []trace.MutatorUtil, end int64) float64 {
		total := 0.0
		var prevU trace.MutatorUtil
		for _, u := range util {
			if u.Time > end {
				total += prevU.Util * float64(end-prevU.Time)
				break
			}
			total += prevU.Util * float64(u.Time-prevU.Time)
			prevU = u
		}
		return total / float64(end-util[0].Time)
	}
	update := func() {
		for i, u := range util {

          + "elementum ullamcorper mattis viverra, dictum sit amet lacus.\n"
          + "\n"
          + "Nunc quis lacus est. Sed aliquam pretium cursus. Sed eu libero eros. In hac habitasse "
          + "platea dictumst. Pellentesque molestie, nibh nec iaculis luctus, justo sem lobortis "