func (h *blockHarness) soi(pref string, iter iterator.Iterator) {
if iter.Prev() {
h.t.Fatalf("block: %sPrev: expect soi", pref)
} else if err := iter.Error(); err != nil {
h.t.Fatalf("block: %sPrev: expect soi but got error, err=%v", pref, err)
}
}
func (h *blockHarness) prev(pref string, iter iterator.Iterator) {
if !iter.Prev() {
h.t.Fatalf("block: %sPrev: eoi, err=%v", pref, iter.Error())
}
}