)

func TestHeap(t *testing.T) {
	var heap []*batchCursor

	// Insert a bunch of values into the heap.
	checkHeap(t, heap)
	heap = heapInsert(heap, makeBatchCursor(5))
	checkHeap(t, heap)
	for i := int64(-20); i < 20; i++ {
		heap = heapInsert(heap, makeBatchCursor(i))
		checkHeap(t, heap)
	}

	// Update an element in the middle to be the new minimum.
	for i := range heap {
		if heap[i].ev.time == 5 {