// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package trie
import (
"testing"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/ethdb"
)
func TestIterator(t *testing.T) {
trie := newEmpty()
vals := []struct{ k, v string }{
{"do", "verb"},
{"ether", "wookiedoo"},
{"horse", "stallion"},
{"shaman", "horse"},
{"doge", "coin"},
{"dog", "puppy"},
{"somethingveryoddindeedthis is", "myothernodedata"},
}
v := make(map[string]bool)
for _, val := range vals {
v[val.k] = false
trie.Update([]byte(val.k), []byte(val.v))
}
trie.Commit()
it := NewIterator(trie)
for it.Next() {
v[string(it.Key)] = true
}
for k, found := range v {
if !found {
t.Error("iterator didn't find", k)
}
}
}
// Tests that the node iterator indeed walks over the entire database contents.
func TestNodeIteratorCoverage(t *testing.T) {
// Create some arbitrary test trie to iterate
db, trie, _ := makeTestTrie()
// Gather all the node hashes found by the iterator
hashes := make(map[common.Hash]struct{})
for it := NewNodeIterator(trie); it.Next(); {
if it.Hash != (common.Hash{}) {
hashes[it.Hash] = struct{}{}
}
}
// Cross check the hashes and the database itself
for hash, _ := range hashes {
if _, err := db.Get(hash.Bytes()); err != nil {
t.Errorf("failed to retrieve reported node %x: %v", hash, err)
}
}
for _, key := range db.(*ethdb.MemDatabase).Keys() {
if _, ok := hashes[common.BytesToHash(key)]; !ok {
t.Errorf("state entry not reported %x", key)
}
}
}
