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path: root/core/state/iterator_test.go
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// Copyright 2015 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 state

import (
    "bytes"
    "testing"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/ethdb"
)

// Tests that the node iterator indeed walks over the entire database contents.
func TestNodeIteratorCoverage(t *testing.T) {
    // Create some arbitrary test state to iterate
    db, root, _ := makeTestState()

    state, err := New(root, db)
    if err != nil {
        t.Fatalf("failed to create state trie at %x: %v", root, err)
    }
    // Gather all the node hashes found by the iterator
    hashes := make(map[common.Hash]struct{})
    for it := NewNodeIterator(state); 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 bytes.HasPrefix(key, []byte("secure-key-")) {
            continue
        }
        if _, ok := hashes[common.BytesToHash(key)]; !ok {
            t.Errorf("state entry not reported %x", key)
        }
    }
}