tree_test.go

// This is free and unencumbered software released into the public domain.
//
// Anyone is free to copy, modify, publish, use, compile, sell, or
// distribute this software, either in source code form or as a compiled
// binary, for any purpose, commercial or non-commercial, and by any
// means.
//
// In jurisdictions that recognize copyright laws, the author or authors
// of this software dedicate any and all copyright interest in the
// software to the public domain. We make this dedication for the benefit
// of the public at large and to the detriment of our heirs and
// successors. We intend this dedication to be an overt act of
// relinquishment in perpetuity of all present and future rights to this
// software under copyright law.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
//
// For more information, please refer to <https://unlicense.org>

package verkle

import (
	"bytes"
	"crypto/rand"
	"encoding/binary"
	"encoding/hex"
	"errors"
	"fmt"
	"io"
	mRand "math/rand"
	"reflect"
	"runtime"
	"sort"
	"strings"
	"testing"
	"testing/quick"
	"time"

	"github.com/davecgh/go-spew/spew"
)

// a 32 byte value, as expected in the tree structure
var testValue = []byte("0123456789abcdef0123456789abcdef")

var (
	zeroKeyTest, _    = hex.DecodeString("0000000000000000000000000000000000000000000000000000000000000000")
	oneKeyTest, _     = hex.DecodeString("0000000000000000000000000000000000000000000000000000000000000001")
	forkOneKeyTest, _ = hex.DecodeString("0001000000000000000000000000000000000000000000000000000000000001")
	fourtyKeyTest, _  = hex.DecodeString("4000000000000000000000000000000000000000000000000000000000000000")
	ffx32KeyTest, _   = hex.DecodeString("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff")
)

func TestInsertIntoRoot(t *testing.T) {
	t.Parallel()

	root := New()
	if err := root.Insert(zeroKeyTest, testValue, nil); err != nil {
		t.Fatalf("error inserting: %v", err)
	}

	leaf, ok := root.(*InternalNode).children[0].(*LeafNode)
	if !ok {
		t.Fatalf("invalid leaf node type %v", root.(*InternalNode).children[0])
	}

	if !bytes.Equal(leaf.values[zeroKeyTest[StemSize]], testValue) {
		t.Fatalf("did not find correct value in trie %x != %x", testValue, leaf.values[zeroKeyTest[StemSize]])
	}
}

func TestInsertTwoLeaves(t *testing.T) {
	t.Parallel()

	root := New()
	if err := root.Insert(zeroKeyTest, testValue, nil); err != nil {
		t.Fatalf("error inserting: %v", err)
	}
	if err := root.Insert(ffx32KeyTest, testValue, nil); err != nil {
		t.Fatalf("error inserting: %v", err)
	}

	leaf0, ok := root.(*InternalNode).children[0].(*LeafNode)
	if !ok {
		t.Fatalf("invalid leaf node type %v", root.(*InternalNode).children[0])
	}

	leaff, ok := root.(*InternalNode).children[255].(*LeafNode)
	if !ok {
		t.Fatalf("invalid leaf node type %v", root.(*InternalNode).children[255])
	}

	if !bytes.Equal(leaf0.values[zeroKeyTest[StemSize]], testValue) {
		t.Fatalf("did not find correct value in trie %x != %x", testValue, leaf0.values[zeroKeyTest[StemSize]])
	}

	if !bytes.Equal(leaff.values[255], testValue) {
		t.Fatalf("did not find correct value in trie %x != %x", testValue, leaff.values[ffx32KeyTest[StemSize]])
	}
}

func TestInsertTwoLeavesLastLevel(t *testing.T) {
	t.Parallel()

	root := New()
	if err := root.Insert(zeroKeyTest, testValue, nil); err != nil {
		t.Fatalf("error inserting: %v", err)
	}
	if err := root.Insert(oneKeyTest, testValue, nil); err != nil {
		t.Fatalf("error inserting: %v", err)
	}

	leaf, ok := root.(*InternalNode).children[0].(*LeafNode)
	if !ok {
		t.Fatalf("invalid leaf node type %v", root.(*InternalNode).children[0])
	}

	if !bytes.Equal(leaf.values[1], testValue) {
		t.Fatalf("did not find correct value in trie %x != %x", testValue, leaf.values[1])
	}
	if !bytes.Equal(leaf.values[0], testValue) {
		t.Fatalf("did not find correct value in trie %x != %x", testValue, leaf.values[0])
	}
}

func TestGetTwoLeaves(t *testing.T) {
	t.Parallel()

	root := New()
	if err := root.Insert(zeroKeyTest, testValue, nil); err != nil {
		t.Fatalf("error inserting: %v", err)
	}
	if err := root.Insert(ffx32KeyTest, testValue, nil); err != nil {
		t.Fatalf("error inserting: %v", err)
	}

	val, err := root.Get(zeroKeyTest, nil)
	if err != nil {
		t.Fatal(err)
	}

	if !bytes.Equal(val, testValue) {
		t.Fatalf("got a different value from the tree than expected %x != %x", val, testValue)
	}

	val, err = root.Get(oneKeyTest, nil)
	if err != nil {
		t.Fatalf("wrong error type, expected %v, got %v", nil, err)
	}
	if val != nil {
		t.Fatalf("Get returned value %x for a non-existing key", val)
	}

	if val != nil {
		t.Fatalf("got a different value from the tree than expected %x != nil", val)
	}
}

func TestOffset2key8BitsWide(t *testing.T) {
	t.Parallel()

	key, _ := hex.DecodeString("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f")
	for i := byte(0); i < KeySize; i++ {
		childId := offset2key(key, i)
		if childId != i {
			t.Fatalf("error getting child number in key %d != %d", childId, i)
		}
	}
}

func TestFlush1kLeaves(t *testing.T) {
	t.Parallel()

	n := 1000
	keys := randomKeysSorted(t, n)

	flushCh := make(chan VerkleNode)
	flush := func(_ []byte, node VerkleNode) {
		flushCh <- node
	}
	go func() {
		root := New()
		for _, k := range keys {
			if err := root.Insert(k, fourtyKeyTest, nil); err != nil {
				panic(err)
			}
		}
		root.(*InternalNode).Flush(flush)
		close(flushCh)
	}()

	count := 0
	leaves := 0
	for n := range flushCh {
		_, isLeaf := n.(*LeafNode)
		_, isInternal := n.(*InternalNode)
		if !isLeaf && !isInternal {
			t.Fatal("invalid node type received, expected leaf")
		}
		if isLeaf {
			leaves++
		}
		count++
	}

	if leaves != n {
		t.Fatalf("number of flushed leaves incorrect. Expected %d got %d\n", n, leaves)
	}
}

func TestCopy(t *testing.T) {
	t.Parallel()

	key1, _ := hex.DecodeString("0105000000000000000000000000000000000000000000000000000000000000")
	key2, _ := hex.DecodeString("0107000000000000000000000000000000000000000000000000000000000000")
	key3, _ := hex.DecodeString("0405000000000000000000000000000000000000000000000000000000000000")
	tree := New()
	if err := tree.Insert(key1, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into the original failed: %v", err)
	}
	if err := tree.Insert(key2, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into the original failed: %v", err)
	}
	tree.Commit()

	copied := tree.Copy()

	if err := tree.Insert(key3, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into the original failed: %v", err)
	}

	if tree.Commit().Equal(copied.Commit()) {
		t.Fatal("inserting the copy into the original tree updated the copy's commitment")
	}

	if err := copied.Insert(key3, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into the copy failed: %v", err)
	}

	if !tree.Commitment().Equal(copied.Commit()) {
		t.Fatalf("differing final commitments %x != %x", tree.Commitment().Bytes(), copied.Commitment().Bytes())
	}
}

func TestCachedCommitment(t *testing.T) {
	t.Parallel()

	key1, _ := hex.DecodeString("0105000000000000000000000000000000000000000000000000000000000000")
	key2, _ := hex.DecodeString("0107000000000000000000000000000000000000000000000000000000000000")
	key3, _ := hex.DecodeString("0405000000000000000000000000000000000000000000000000000000000000")
	key4, _ := hex.DecodeString("0407000000000000000000000000000000000000000000000000000000000000")
	tree := New()
	if err := tree.Insert(key1, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into the original failed: %v", err)
	}
	if err := tree.Insert(key2, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into the original failed: %v", err)
	}
	if err := tree.Insert(key3, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into the original failed: %v", err)
	}
	oldRoot := tree.Commit().Bytes()
	oldInternal := tree.(*InternalNode).children[4].(*LeafNode).commitment.Bytes()

	if tree.(*InternalNode).commitment == nil {
		t.Error("root has not cached commitment")
	}

	if err := tree.Insert(key4, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into key4 failed: %v", err)
	}
	tree.Commit()

	if tree.(*InternalNode).Commitment().Bytes() == oldRoot {
		t.Error("root has stale commitment")
	}
	if tree.(*InternalNode).children[4].(*InternalNode).commitment.Bytes() == oldInternal {
		t.Error("internal node has stale commitment")
	}
	if tree.(*InternalNode).children[1].(*InternalNode).commitment == nil {
		t.Error("internal node has mistakenly cleared cached commitment")
	}
}

func TestDelLeaf(t *testing.T) { // skipcq: GO-R1005
	t.Parallel()

	key1, _ := hex.DecodeString("0105000000000000000000000000000000000000000000000000000000000000")
	key1p, _ := hex.DecodeString("0105000000000000000000000000000000000000000000000000000000000001")  // same Cn group as key1
	key1pp, _ := hex.DecodeString("0105000000000000000000000000000000000000000000000000000000000081") // Other Cn group as key1
	key2, _ := hex.DecodeString("0107000000000000000000000000000000000000000000000000000000000000")
	key3, _ := hex.DecodeString("0405000000000000000000000000000000000000000000000000000000000000")
	tree := New()
	if err := tree.Insert(key1, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into the original failed: %v", err)
	}
	if err := tree.Insert(key1p, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into the original failed: %v", err)
	}
	if err := tree.Insert(key1pp, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into the original failed: %v", err)
	}
	if err := tree.Insert(key2, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into the original failed: %v", err)
	}
	var init Point
	init.Set(tree.Commit())

	if err := tree.Insert(key3, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into the original failed: %v", err)
	}
	if _, err := tree.Delete(key3, nil); err != nil {
		t.Error(err)
	}

	// the pre and post deletion hashes should be different,
	// as deleting a value means replacing it with a 0 in verkle
	// trees.
	postHash := tree.Commit()
	if !init.Equal(postHash) {
		t.Errorf("deleting leaf resulted in unexpected tree %x %x", init.Bytes(), postHash.Bytes())
	}

	res, err := tree.Get(key3, nil)
	if err != nil {
		t.Error(err)
	}
	if len(res) > 0 {
		t.Error("leaf hasnt been deleted")
	}

	if _, err := tree.Delete(key1pp, nil); err != nil {
		t.Fatal(err)
	}
	res, err = tree.Get(key1pp, nil)
	if err != nil {
		t.Error(err)
	}
	if len(res) > 0 {
		t.Error("leaf hasnt been deleted")
	}

	if _, err := tree.Delete(key1p, nil); err != nil {
		t.Fatal(err)
	}
	res, err = tree.Get(key1p, nil)
	if err != nil {
		t.Error(err)
	}
	if len(res) > 0 {
		t.Error("leaf hasnt been deleted")
	}
}

func TestDeleteNonExistent(t *testing.T) {
	t.Parallel()

	key1, _ := hex.DecodeString("0105000000000000000000000000000000000000000000000000000000000000")
	key2, _ := hex.DecodeString("0107000000000000000000000000000000000000000000000000000000000000")
	key3, _ := hex.DecodeString("0405000000000000000000000000000000000000000000000000000000000000")
	tree := New()
	if err := tree.Insert(key1, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into key1 failed: %v", err)
	}
	if err := tree.Insert(key2, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into key2 failed: %v", err)
	}
	if _, err := tree.Delete(key3, nil); err != nil {
		t.Error("should not fail when deleting a non-existent key")
	}
}

func TestDeletePrune(t *testing.T) { // skipcq: GO-R1005
	t.Parallel()

	key1, _ := hex.DecodeString("0105000000000000000000000000000000000000000000000000000000000000")
	key2, _ := hex.DecodeString("0107000000000000000000000000000000000000000000000000000000000000")
	key3, _ := hex.DecodeString("0405000000000000000000000000000000000000000000000000000000000000")
	key4, _ := hex.DecodeString("0407000000000000000000000000000000000000000000000000000000000000")
	key5, _ := hex.DecodeString("04070000000000000000000000000000000000000000000000000000000000FF")
	tree := New()
	if err := tree.Insert(key1, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into key1 failed: %v", err)
	}
	if err := tree.Insert(key2, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into key2 failed: %v", err)
	}

	var hashPostKey2, hashPostKey4, completeTreeHash Point
	hashPostKey2.Set(tree.Commit())
	if err := tree.Insert(key3, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into key3 failed: %v", err)
	}
	if err := tree.Insert(key4, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into key4 failed: %v", err)
	}
	hashPostKey4.Set(tree.Commit())
	if err := tree.Insert(key5, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into key5 failed: %v", err)
	}
	completeTreeHash.Set(tree.Commit()) // hash when the tree has received all its keys

	// Delete key5.
	if _, err := tree.Delete(key5, nil); err != nil {
		t.Error(err)
	}
	postHash := tree.Commit()
	// Check that the deletion updated the root hash and that it's not
	// the same as the pre-deletion hash.
	if completeTreeHash.Equal(postHash) {
		t.Fatalf("deletion did not update the hash %x == %x", completeTreeHash, postHash)
	}
	// The post deletion hash should be the same as the post key4 hash.
	if !hashPostKey4.Equal(postHash) {
		t.Error("deleting leaf #5 resulted in unexpected tree")
	}
	res, err := tree.Get(key5, nil)
	if err != nil {
		t.Error(err)
	}
	if len(res) > 0 {
		t.Error("leaf #5 hasn't been deleted")
	}

	// Delete key4 and key3.
	if _, err := tree.Delete(key4, nil); err != nil {
		t.Error(err)
	}
	if _, err := tree.Delete(key3, nil); err != nil {
		t.Error(err)
	}
	postHash = tree.Commit()
	// The post deletion hash should be different from the post key2 hash.
	if !hashPostKey2.Equal(postHash) {
		t.Error("deleting leaf #3 resulted in unexpected tree")
	}
	res, err = tree.Get(key3, nil)
	if err != nil {
		t.Error(err)
	}
	if len(res) > 0 {
		t.Error("leaf hasnt been deleted")
	}
}

// A test that inserts 3 keys in a tree, and then replaces two of them with
// their hashed values. It then tries to delete the hashed values, which should
// fail.
func TestDeleteHash(t *testing.T) {
	//TODO: fix this test when we take a final decision about FlushAtDepth API.
	t.SkipNow()

	key1, _ := hex.DecodeString("0105000000000000000000000000000000000000000000000000000000000000")
	key2, _ := hex.DecodeString("0107000000000000000000000000000000000000000000000000000000000000")
	key3, _ := hex.DecodeString("0405000000000000000000000000000000000000000000000000000000000000")
	tree := New()
	if err := tree.Insert(key1, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into key1 failed: %v", err)
	}
	if err := tree.Insert(key2, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into key2 failed: %v", err)
	}
	if err := tree.Insert(key3, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into key3 failed: %v", err)
	}
	tree.(*InternalNode).FlushAtDepth(0, func(path []byte, vn VerkleNode) {})
	tree.Commit()
	if _, err := tree.Delete(key2, nil); err != errDeleteHash {
		t.Fatalf("did not report the correct error while deleting from a hash: %v", err)
	}
}

func TestDeleteUnequalPath(t *testing.T) {
	t.Parallel()

	key1, _ := hex.DecodeString("0105000000000000000000000000000000000000000000000000000000000000")
	key2, _ := hex.DecodeString("0107000000000000000000000000000000000000000000000000000000000000")
	key3, _ := hex.DecodeString("0405000000000000000000000000000000000000000000000000000000000000")
	tree := New()
	if err := tree.Insert(key1, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into key1 failed: %v", err)
	}
	if err := tree.Insert(key3, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into key3 failed: %v", err)
	}
	tree.Commit()

	if _, err := tree.Delete(key2, nil); err != nil {
		t.Fatalf("errored during the deletion of non-existing key, err =%v", err)
	}
}

func TestDeleteResolve(t *testing.T) {
	//TODO: fix this test when we take a final decision about FlushAtDepth API.
	t.SkipNow()

	key1, _ := hex.DecodeString("0105000000000000000000000000000000000000000000000000000000000000")
	key2, _ := hex.DecodeString("0107000000000000000000000000000000000000000000000000000000000000")
	key3, _ := hex.DecodeString("0405000000000000000000000000000000000000000000000000000000000000")
	tree := New()
	savedNodes := make(map[string]VerkleNode)
	saveNode := func(path []byte, node VerkleNode) {
		savedNodes[string(path)] = node
	}
	if err := tree.Insert(key1, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into key1 failed: %v", err)
	}
	if err := tree.Insert(key2, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into key2 failed: %v", err)
	}
	if err := tree.Insert(key3, fourtyKeyTest, nil); err != nil {
		t.Fatalf("inserting into key3 failed: %v", err)
	}
	tree.(*InternalNode).FlushAtDepth(0, saveNode)
	tree.Commit()

	var called bool
	_, err := tree.Delete(key2, func(path []byte) ([]byte, error) {
		called = true

		if node, ok := savedNodes[string(path)]; ok {
			return node.Serialize()
		}

		t.Fatal("could not find node")
		return nil, fmt.Errorf("node not found")
	})
	if !called {
		t.Fatal("should have called the resolve function")
	}
	if err != nil {
		t.Fatalf("error deleting key: %v", err)
	}
}

func TestConcurrentTrees(t *testing.T) {
	t.Parallel()

	tree := New()
	err := tree.Insert(zeroKeyTest, fourtyKeyTest, nil)
	if err != nil {
		t.Fatal(err)
	}
	expected := tree.Commit()

	threads := 2
	ch := make(chan *Point)
	builder := func() {
		tree := New()
		if err := tree.Insert(zeroKeyTest, fourtyKeyTest, nil); err != nil {
			panic(err)
		}
		ch <- tree.Commit()
	}

	for i := 0; i < threads; i++ {
		go builder()
	}

	for i := 0; i < threads; i++ {
		root := <-ch
		if !root.Equal(expected) {
			t.Error("Incorrect root")
		}
	}
}

func BenchmarkCommitLeaves(b *testing.B) {
	benchmarkCommitNLeaves(b, 1000)
	benchmarkCommitNLeaves(b, 10000)
}

func BenchmarkCommitFullNode(b *testing.B) {
	nChildren := 256
	keys := make([][]byte, nChildren)
	for i := 0; i < nChildren; i++ {
		key := make([]byte, KeySize)
		key[0] = uint8(i)
		keys[i] = key
	}
	b.ResetTimer()
	b.ReportAllocs()

	for i := 0; i < b.N; i++ {
		root := New()
		for _, k := range keys {
			if err := root.Insert(k, fourtyKeyTest, nil); err != nil {
				b.Fatal(err)
			}
		}
		root.Commit()
	}
}

func benchmarkCommitNLeaves(b *testing.B, n int) {
	type kv struct {
		k []byte
		v []byte
	}
	kvs := make([]kv, n)
	sortedKVs := make([]kv, n)

	for i := 0; i < n; i++ {
		key := make([]byte, KeySize)
		val := make([]byte, KeySize)
		if _, err := rand.Read(key); err != nil {
			b.Fatalf("failed to generate random key: %v", err)
		}
		if _, err := rand.Read(val); err != nil {
			b.Fatalf("failed to generate random value: %v", err)
		}
		kvs[i] = kv{k: key, v: val}
		sortedKVs[i] = kv{k: key, v: val}
	}

	// InsertOrder assumes keys are sorted
	sortKVs := func(src []kv) {
		sort.Slice(src, func(i, j int) bool { return bytes.Compare(src[i].k, src[j].k) < 0 })
	}
	sortKVs(sortedKVs)

	b.Run(fmt.Sprintf("insert/leaves/%d", n), func(b *testing.B) {
		b.ResetTimer()
		b.ReportAllocs()

		for i := 0; i < b.N; i++ {
			root := New()
			for _, el := range kvs {
				if err := root.Insert(el.k, el.v, nil); err != nil {
					b.Error(err)
				}
			}
			root.Commit()
		}
	})
}

func BenchmarkModifyLeaves(b *testing.B) {
	mRand.Seed(time.Now().UnixNano()) // skipcq: GO-S1033

	n := 200000
	toEdit := 10000
	val := []byte{0}
	keys := make([][]byte, n)
	root := New()
	for i := 0; i < n; i++ {
		key := make([]byte, KeySize)
		if _, err := rand.Read(key); err != nil {
			b.Fatalf("failed to generate random key: %v", err)
		}
		keys[i] = key
		if err := root.Insert(key, val, nil); err != nil {
			b.Fatalf("inserting into key1 failed: %v", err)
		}
	}
	root.Commit()

	b.ResetTimer()
	b.ReportAllocs()

	val = make([]byte, 4)
	for i := 0; i < b.N; i++ {
		binary.BigEndian.PutUint32(val, uint32(i))
		for j := 0; j < toEdit; j++ {
			// skipcq: GSC-G404
			k := keys[mRand.Intn(n)]
			if err := root.Insert(k, val, nil); err != nil {
				b.Error(err)
			}
		}
		root.Commit()
	}
}

func randomKeys(t *testing.T, n int) [][]byte {
	keys := make([][]byte, n)
	for i := 0; i < n; i++ {
		key := make([]byte, KeySize)
		if _, err := rand.Read(key); err != nil {
			t.Fatalf("failed to generate random key: %v", err)
		}
		keys[i] = key
	}
	return keys
}

func randomKeysSorted(t *testing.T, n int) [][]byte {
	keys := randomKeys(t, n)
	sort.Slice(keys, func(i, j int) bool { return bytes.Compare(keys[i], keys[j]) < 0 })
	return keys
}

func TestNodeSerde(t *testing.T) {
	t.Parallel()

	tree := New()
	if err := tree.Insert(zeroKeyTest, testValue, nil); err != nil {
		t.Fatalf("inserting into key1 failed: %v", err)
	}
	if err := tree.Insert(fourtyKeyTest, testValue, nil); err != nil {
		t.Fatalf("inserting into key2 failed: %v", err)
	}
	origComm := tree.Commit().BytesUncompressedTrusted()
	root := tree.(*InternalNode)

	// Serialize all the nodes
	leaf0 := (root.children[0]).(*LeafNode)
	ls0, err := leaf0.Serialize()
	if err != nil {
		t.Error(err)
	}

	leaf64 := (root.children[64]).(*LeafNode)
	ls64, err := leaf64.Serialize()
	if err != nil {
		t.Error(err)
	}

	rs, err := root.Serialize()
	if err != nil {
		t.Error(err)
	}

	// Now deserialize and re-construct tree
	res, err := ParseNode(ls0, 1)
	if err != nil {
		t.Fatal(err)
	}
	resLeaf0 := res.(*LeafNode)

	res, err = ParseNode(ls64, 1)
	if err != nil {
		t.Fatal(err)
	}
	resLeaf64 := res.(*LeafNode)

	res, err = ParseNode(rs, 0)
	if err != nil {
		t.Fatal(err)
	}
	resRoot := res.(*InternalNode)

	resRoot.children[0] = resLeaf0
	resRoot.children[64] = resLeaf64

	if !isInternalEqual(root, resRoot) {
		t.Fatalf("parsed node not equal, %x != %x", root.commitment.BytesUncompressedTrusted(), resRoot.commitment.BytesUncompressedTrusted())
	}

	if resRoot.Commitment().BytesUncompressedTrusted() != origComm {
		t.Fatal("invalid deserialized commitment")
	}
}

func isInternalEqual(a, b *InternalNode) bool {
	for i := 0; i < NodeWidth; i++ {
		c := a.children[i]
		switch c.(type) {
		case Empty:
			if _, ok := b.children[i].(Empty); !ok {
				return false
			}
		case HashedNode:
			if _, ok := b.children[i].(HashedNode); !ok {
				return false
			}
		case *LeafNode:
			ln, ok := b.children[i].(*LeafNode)
			if !ok {
				return false
			}
			if !isLeafEqual(c.(*LeafNode), ln) {
				return false
			}
		case *InternalNode:
			in, ok := b.children[i].(*InternalNode)
			if !ok {
				return false
			}
			if !isInternalEqual(c.(*InternalNode), in) {
				return false
			}
		}
	}

	return true
}

func isLeafEqual(a, b *LeafNode) bool {
	if !bytes.Equal(a.stem, b.stem) {
		return false
	}

	for i, v := range a.values {
		if !bytes.Equal(v, b.values[i]) {
			return false
		}
	}

	return true
}

func TestGetResolveFromHash(t *testing.T) {
	//TODO: fix this test when we take a final decision about FlushAtDepth API.
	t.SkipNow()

	var count uint
	dummyError := errors.New("dummy")
	var serialized []byte
	getter := func([]byte) ([]byte, error) {
		count++

		return serialized, nil
	}
	failingGetter := func([]byte) ([]byte, error) {
		return nil, dummyError
	}
	flush := func(_ []byte, n VerkleNode) {
		s, err := n.Serialize()
		if err != nil {
			panic(err)
		}
		serialized = append(serialized, s...)
	}
	root := New()
	if err := root.Insert(zeroKeyTest, zeroKeyTest, nil); err != nil {
		t.Fatalf("inserting into the original failed: %v", err)
	}
	if err := root.Insert(fourtyKeyTest, zeroKeyTest, nil); err != nil {
		t.Fatalf("inserting into the original failed: %v", err)
	}
	root.(*InternalNode).FlushAtDepth(0, flush)
	if err := root.Insert(oneKeyTest, zeroKeyTest, nil); err != errInsertIntoHash {
		t.Fatal(err)
	}

	data, err := root.Get(zeroKeyTest, nil)
	if !errors.Is(err, errReadFromInvalid) || len(data) != 0 {
		t.Fatal(err)
	}

	data, err = root.Get(zeroKeyTest, failingGetter)
	if !errors.Is(err, dummyError) || len(data) != 0 {
		t.Fatal(err)
	}

	data, err = root.Get(zeroKeyTest, getter)
	if err != nil {
		t.Fatalf("error resolving hash: %v", err)
	}
	if count != 1 {
		t.Fatalf("error getting the correct number of nodes: 1 != %d", count)
	}
	if !bytes.Equal(data, zeroKeyTest) {
		t.Fatalf("invalid result: %x != %x", zeroKeyTest, len(data))
	}

	if hsh := root.Hash(); hsh == nil {
		t.Fatalf("root hash can't be nil")
	}
}

func TestGetKey(t *testing.T) {
	t.Parallel()

	root := &LeafNode{stem: fourtyKeyTest}
	for i := 0; i < NodeWidth; i++ {
		k := root.Key(i)
		if !bytes.Equal(KeyToStem(k), KeyToStem(fourtyKeyTest)) {
			t.Fatal("invalid stem")
		}
		if int(k[StemSize]) != i {
			t.Fatal("invalid selector")
		}
	}
}

func TestInsertIntoHashedNode(t *testing.T) {
	//TODO: fix this test when we take a final decision about FlushAtDepth API.
	t.SkipNow()

	root := New()
	if err := root.Insert(zeroKeyTest, zeroKeyTest, nil); err != nil {
		t.Fatalf("inserting into the original failed: %v", err)
	}
	root.(*InternalNode).FlushAtDepth(0, func(_ []byte, n VerkleNode) {})
	if err := root.Insert(fourtyKeyTest, zeroKeyTest, nil); err != nil {
		t.Fatalf("inserting into the original failed: %v", err)
	}

	if err := root.Insert(zeroKeyTest, zeroKeyTest, nil); err != errInsertIntoHash {
		t.Fatalf("incorrect error type: %v", err)
	}

	resolver := func(h []byte) ([]byte, error) {
		values := make([][]byte, NodeWidth)
		values[0] = zeroKeyTest
		node, _ := NewLeafNode(KeyToStem(zeroKeyTest), values)

		return node.Serialize()
	}
	if err := root.Copy().Insert(zeroKeyTest, zeroKeyTest, resolver); err != nil {
		t.Fatalf("error in node resolution: %v", err)
	}

	// Check that the proper error is raised if the RLP data is invalid and the
	// node can not be parsed.
	invalidRLPResolver := func(h []byte) ([]byte, error) {
		values := make([][]byte, NodeWidth)
		values[0] = zeroKeyTest
		node, _ := NewLeafNode(KeyToStem(zeroKeyTest), values)

		rlp, _ := node.Serialize()
		return rlp[:len(rlp)-10], nil
	}
	if err := root.Copy().Insert(zeroKeyTest, zeroKeyTest, invalidRLPResolver); !errors.Is(err, errSerializedPayloadTooShort) {
		t.Fatalf("error detecting a decoding error after resolution: %v", err)
	}

	randomResolverError := errors.New("'clef' was mispronounced")
	// Check that the proper error is raised if the resolver returns an error
	erroringResolver := func(h []byte) ([]byte, error) {
		return nil, randomResolverError
	}
	if err := root.Copy().Insert(zeroKeyTest, zeroKeyTest, erroringResolver); !errors.Is(err, randomResolverError) {
		t.Fatalf("error detecting a resolution error: %v", err)
	}
}

func TestToDot(t *testing.T) {
	root := New()
	if err := root.Insert(zeroKeyTest, zeroKeyTest, nil); err != nil {
		t.Fatalf("inserting into the original failed: %v", err)
	}
	// TODO fix the issue with FlushAtDepth so that we can also try to verify the display of hashed nodes
	// root.(*InternalNode).FlushAtDepth(0, func(_ []byte, n VerkleNode) {}) // Hash the leaf to ensure HashedNodes display correctly
	if err := root.Insert(fourtyKeyTest, zeroKeyTest, nil); err != nil {
		t.Fatalf("inserting into the original failed: %v", err)
	}
	fourtytwoKeyTest, _ := hex.DecodeString("4020000000000000000000000000000000000000000000000000000000000000")
	if err := root.Insert(fourtytwoKeyTest, zeroKeyTest, nil); err != nil {
		t.Fatalf("inserting into the original failed: %v", err)
	}

	fmt.Println(ToDot(root))

	// ensure the ToDot output contains a single HashedNode
	// TODO see other TODO above
	// if !strings.Contains(ToDot(root), "hash00") {
	// 	t.Error("ToDot output does not contain a HashedNode")
	// }

	// ensure the ToDot output contains two LeafNodes
	if !strings.Contains(ToDot(root), "leaf4000") {
		t.Error("ToDot output is missing a LeafNode")
	}
	if !strings.Contains(ToDot(root), "leaf4020") {
		t.Error("ToDot output is missing a LeafNode")
	}

	// ensure the ToDot output contains two InternalNodes
	if !strings.Contains(ToDot(root), "internal ") {
		t.Error("ToDot output is missing an InternalNode")
	}
	if !strings.Contains(ToDot(root), "internal40") {
		t.Error("ToDot output is missing an InternalNode")
	}
}

func TestEmptyCommitment(t *testing.T) {
	t.Parallel()

	root := New()
	if err := root.Insert(zeroKeyTest, zeroKeyTest, nil); err != nil {
		t.Fatalf("inserting into the original failed: %v", err)
	}
	root.Commit()
	pe, _, _, err := root.GetProofItems(keylist{ffx32KeyTest}, nil)
	if err != nil {
		t.Fatal(err)
	}
	if len(pe.Cis) != 1 || len(pe.Zis) != 1 || len(pe.Yis) != 1 || len(pe.Fis) != 1 {
		t.Fatalf("invalid parameter list length")
	}

	if !pe.Cis[0].Equal(root.(*InternalNode).commitment) {
		t.Fatalf("invalid commitment %x %x", pe.Cis[0], root.(*InternalNode).commitment)
	}

	zero := new(Fr)
	if !pe.Yis[0].Equal(zero) {
		t.Fatalf("invalid yi %v %v", zero, pe.Yis[0])
	}
}

func TestLeafToCommsMoreThan32(t *testing.T) {
	t.Parallel()

	defer func() {
	}()
	var value [33]byte
	err := leafToComms([]Fr{}, value[:])
	if err == nil {
		t.Fatal("didn't catch length error")
	}
}

func TestLeafToCommsLessThan32(t *testing.T) {
	t.Parallel()

	var (
		value [16]byte
		p     [2]Fr
	)
	if err := leafToComms(p[:], value[:]); err != nil {
		t.Fatalf("error in leafToComms: %v", err)
	}
}

func TestLeafToCommsLessThan16(t *testing.T) {
	t.Parallel()

	var (
		value [4]byte
		p     [2]Fr
	)
	if err := leafToComms(p[:], value[:]); err != nil {
		t.Fatalf("error in leafToComms: %v", err)
	}
}

func TestGetProofItemsNoPoaIfStemPresent(t *testing.T) {
	t.Parallel()

	root := New()
	if err := root.Insert(ffx32KeyTest, zeroKeyTest, nil); err != nil {
		t.Fatalf("inserting into the original failed: %v", err)
	}

	// insert two keys that differ from the inserted stem
	// by one byte.
	key1, _ := hex.DecodeString("ffff00ffffffffffffffffffffffffffffffffffffffffffffffffffffffffff")
	key2, _ := hex.DecodeString("ffffff00ffffffffffffffffffffffffffffffffffffffffffffffffffffffff")

	_, esses, poas, err := root.GetProofItems(keylist{key1, key2, ffx32KeyTest}, nil)
	if err != nil {
		t.Fatal(err)
	}
	if len(poas) != 0 {
		t.Fatalf("returned %d poas instead of 0", len(poas))
	}
	if len(esses) != 3 {
		t.Fatalf("returned %d extension statuses instead of the expected 3", len(esses))
	}
}

var (
	testAccountKeys = [][]byte{
		{245, 110, 100, 66, 36, 244, 87, 100, 144, 207, 224, 222, 20, 36, 164, 83, 34, 18, 82, 155, 254, 55, 71, 19, 216, 78, 125, 126, 142, 146, 114, 0},
		{245, 110, 100, 66, 36, 244, 87, 100, 144, 207, 224, 222, 20, 36, 164, 83, 34, 18, 82, 155, 254, 55, 71, 19, 216, 78, 125, 126, 142, 146, 114, 1},
		{245, 110, 100, 66, 36, 244, 87, 100, 144, 207, 224, 222, 20, 36, 164, 83, 34, 18, 82, 155, 254, 55, 71, 19, 216, 78, 125, 126, 142, 146, 114, 2},
		{245, 110, 100, 66, 36, 244, 87, 100, 144, 207, 224, 222, 20, 36, 164, 83, 34, 18, 82, 155, 254, 55, 71, 19, 216, 78, 125, 126, 142, 146, 114, 3},
		{245, 110, 100, 66, 36, 244, 87, 100, 144, 207, 224, 222, 20, 36, 164, 83, 34, 18, 82, 155, 254, 55, 71, 19, 216, 78, 125, 126, 142, 146, 114, 4},
	}

	testAccountValues = [][]byte{
		{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
		{0, 0, 100, 167, 179, 182, 224, 13, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
		{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
		{197, 210, 70, 1, 134, 247, 35, 60, 146, 126, 125, 178, 220, 199, 3, 192, 229, 0, 182, 83, 202, 130, 39, 59, 123, 250, 216, 4, 93, 133, 164, 112},
		{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
	}
	testAccountRootCommRust, _ = hex.DecodeString("10ed89d89047bb168baa4e69b8607e260049e928ddbcb2fdd23ea0f4182b1f8a")
)

func TestWithRustCompatibility(t *testing.T) {
	t.Parallel()

	root := New()
	for i, key := range testAccountKeys {
		err := root.Insert(key, testAccountValues[i], nil)
		if err != nil {
			t.Fatalf("error inserting: %v", err)
		}
	}

	commBytes := root.Commit().Bytes()
	if !bytes.Equal(commBytes[:], testAccountRootCommRust) {
		t.Fatalf("rust and golang impl are not compatible rust=%x, go=%x", testAccountRootCommRust, commBytes)
	}
}

func TestInsertStem(t *testing.T) {
	t.Parallel()

	root1 := New()
	root2 := New()

	values := make([][]byte, 256)
	values[5] = zeroKeyTest
	values[192] = fourtyKeyTest

	if err := root1.(*InternalNode).InsertValuesAtStem(KeyToStem(fourtyKeyTest), values, nil); err != nil {
		t.Fatalf("error inserting: %s", err)
	}
	r1c := root1.Commit()

	var key5, key192 [KeySize]byte
	copy(key5[:], KeyToStem(fourtyKeyTest))
	copy(key192[:], KeyToStem(fourtyKeyTest))
	key5[StemSize] = 5
	key192[StemSize] = 192
	if err := root2.Insert(key5[:], zeroKeyTest, nil); err != nil {
		t.Fatalf("error inserting: %s", err)
	}
	if err := root2.Insert(key192[:], fourtyKeyTest, nil); err != nil {
		t.Fatalf("error inserting: %s", err)
	}
	r2c := root2.Commit()

	if !r1c.Equal(r2c) {
		t.Fatalf("differing commitments %x != %x %s %s", r1c.Bytes(), r2c.Bytes(), ToDot(root1), ToDot(root2))
	}
}

func TestInsertStemTouchingBothHalves(t *testing.T) {
	t.Parallel()

	root := New()

	// Insert keys such that both C1 and C2 have values.
	if err := root.Insert(zeroKeyTest, testValue, nil); err != nil {
		t.Fatalf("error inserting: %v", err)
	}
	zeroKeyTest2 := append([]byte{}, zeroKeyTest...)
	zeroKeyTest2[StemSize] = NodeWidth - 1 // Insert "on the opposite side" of the leaf vector.
	root.Commit()

	// Invariant check for the test.
	ln := root.(*InternalNode).children[0].(*LeafNode)
	if ln.c1 == nil || ln.c2 == nil {
		t.Fatalf("invariant violated: leaf node does not have both c1 and c2")
	}
	originalC1 := *ln.c1
	originalC2 := *ln.c2

	// Insert a stem that touches both halves of the leaf vector.
	newValues := make([][]byte, NodeWidth)
	newValues[1] = testValue
	newValues[NodeWidth-2] = testValue
	if err := root.(*InternalNode).InsertValuesAtStem(KeyToStem(zeroKeyTest), newValues, nil); err != nil {
		t.Fatalf("error inserting stem: %v", err)
	}
	root.Commit()

	if originalC1.Equal(ln.c1) || originalC2.Equal(ln.c2) {
		t.Fatalf("c1 and c2 must have changed")
	}
}

func TestInsertResolveSplitLeaf(t *testing.T) {
	t.Parallel()

	var leaf *LeafNode

	// Insert a unique leaf and flush it
	root := New()
	if err := root.Insert(zeroKeyTest, ffx32KeyTest, nil); err != nil {
		t.Fatalf("error inserting: %v", err)
	}
	root.(*InternalNode).Flush(func(_ []byte, node VerkleNode) {
		l, ok := node.(*LeafNode)
		if !ok {
			return
		}

		if leaf != nil {
			t.Fatal("there should only be one leaf")
		}
		leaf = l
	})

	// check that the leafnode is now a hashed node
	if _, ok := root.(*InternalNode).children[0].(HashedNode); !ok {
		t.Fatal("flush didn't produce a hashed node")
	}

	// Now insert another leaf, with a resolver function
	key, _ := hex.DecodeString("0000100000000000000000000000000000000000000000000000000000000000")
	if err := root.Insert(key, ffx32KeyTest, func(path []byte) ([]byte, error) {
		if len(path) != int(leaf.depth) {
			return nil, fmt.Errorf("invalid path length: %d != %d", len(path), leaf.depth)
		}
		if bytes.Equal(path, leaf.stem[:len(path)]) {
			ls, err := leaf.Serialize()
			if err != nil {
				return nil, err
			}
			return ls, nil
		}

		return nil, fmt.Errorf("asked for %x, expected %x", path, leaf.stem[:len(path)])
	}); err != nil {
		t.Fatal(err)
	}

	if _, ok := root.(*InternalNode).children[0].(*InternalNode); !ok {
		t.Fatal("resolution didn't produce and intermediate, intermediate node")
	}
	l, ok := root.(*InternalNode).children[0].(*InternalNode).children[0].(*InternalNode).children[0].(*LeafNode)
	if !ok {
		t.Fatal("resolve with resolver didn't produce a leaf node where expected")
	}
	if !bytes.Equal(l.stem, KeyToStem(zeroKeyTest)) && !bytes.Equal(l.values[0], ffx32KeyTest) {
		t.Fatal("didn't find the resolved leaf where expected")
	}
}

func TestRustBanderwagonBlock48(t *testing.T) {
	t.Parallel()

	keyStrings := []string{
		"744f493648c83c5ede1726a0cfbe36d3830fd5b64a820b79ca77fe1593352600",
		"744f493648c83c5ede1726a0cfbe36d3830fd5b64a820b79ca77fe1593352601",
		"744f493648c83c5ede1726a0cfbe36d3830fd5b64a820b79ca77fe1593352602",
		"744f493648c83c5ede1726a0cfbe36d3830fd5b64a820b79ca77fe1593352603",
		"744f493648c83c5ede1726a0cfbe36d3830fd5b64a820b79ca77fe1593352604",
		"744f493648c83c5ede1726a0cfbe36d3830fd5b64a820b79ca77fe1593352640",
		"744f493648c83c5ede1726a0cfbe36d3830fd5b64a820b79ca77fe1593352680",
		"744f493648c83c5ede1726a0cfbe36d3830fd5b64a820b79ca77fe1593352681",
		"744f493648c83c5ede1726a0cfbe36d3830fd5b64a820b79ca77fe1593352682",
		"744f493648c83c5ede1726a0cfbe36d3830fd5b64a820b79ca77fe1593352683",
		"744f493648c83c5ede1726a0cfbe36d3830fd5b64a820b79ca77fe1593352684",
		"744f493648c83c5ede1726a0cfbe36d3830fd5b64a820b79ca77fe1593352685",
		"744f493648c83c5ede1726a0cfbe36d3830fd5b64a820b79ca77fe1593352686",
		"744f493648c83c5ede1726a0cfbe36d3830fd5b64a820b79ca77fe1593352687",
		"744f493648c83c5ede1726a0cfbe36d3830fd5b64a820b79ca77fe1593352688",
		"744f493648c83c5ede1726a0cfbe36d3830fd5b64a820b79ca77fe1593352689",
		"9661ae0db10ecdb9bea3ef0c5fb46bb233cb6ed7404b77e7b0732512ecc60100",
		"9661ae0db10ecdb9bea3ef0c5fb46bb233cb6ed7404b77e7b0732512ecc60101",
		"9661ae0db10ecdb9bea3ef0c5fb46bb233cb6ed7404b77e7b0732512ecc60102",
		"9661ae0db10ecdb9bea3ef0c5fb46bb233cb6ed7404b77e7b0732512ecc60103",
		"9661ae0db10ecdb9bea3ef0c5fb46bb233cb6ed7404b77e7b0732512ecc60104",
	}

	var keys [][]byte
	for _, s := range keyStrings {
		k, _ := hex.DecodeString(s)
		keys = append(keys, k)
	}
	tree := New()

	valStrings := []string{
		"0000000000000000000000000000000000000000000000000000000000000000",
		"0000000000000000000000000000000000000000000000000000000000000000",
		"0100000000000000000000000000000000000000000000000000000000000000",
		"f8811a5ee0d54eca4880eaee7b102eae4b3963ff343f50a024c0fd3d367cb8cc",
		"5001000000000000000000000000000000000000000000000000000000000000",
		"",
		"00608060405234801561001057600080fd5b50600436106100365760003560e0",
		"001c80632e64cec11461003b5780636057361d14610059575b600080fd5b6100",
		"0143610075565b60405161005091906100d9565b60405180910390f35b610073",
		"00600480360381019061006e919061009d565b61007e565b005b600080549050",
		"0090565b8060008190555050565b60008135905061009781610103565b929150",
		"0050565b6000602082840312156100b3576100b26100fe565b5b60006100c184",
		"00828501610088565b91505092915050565b6100d3816100f4565b8252505056",
		"005b60006020820190506100ee60008301846100ca565b92915050565b600081",
		"009050919050565b600080fd5b61010c816100f4565b811461011757600080fd",
		"005b5056fea2646970667358221220404e37f487a89a932dca5e77faaf6ca2de",
		"0000000000000000000000000000000000000000000000000000000000000000",
		"507a878a1965b9e2ce3f00000000000000000000000000000000000000000000",
		"0200000000000000000000000000000000000000000000000000000000000000",
		"c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470",
		"0000000000000000000000000000000000000000000000000000000000000000",
	}
	initialVals := map[string][]byte{}

	for i, s := range valStrings {
		if s == "" {
			continue
		}

		v, _ := hex.DecodeString(s)
		if err := tree.Insert(keys[i], v, nil); err != nil {
			t.Fatalf("error inserting: %v", err)
		}

		initialVals[string(keys[i])] = v
	}

	// Insert the code chunk that isn't part of the proof
	missingKey, _ := hex.DecodeString("744f493648c83c5ede1726a0cfbe36d3830fd5b64a820b79ca77fe159335268a")
	missingVal, _ := hex.DecodeString("133b991f93d230604b1b8daaef64766264736f6c634300080700330000000000")
	if err := tree.Insert(missingKey, missingVal, nil); err != nil {
		t.Fatalf("error inserting: %v", err)
	}

	r := tree.Commit()

	proof, cis, zis, yis, _ := MakeVerkleMultiProof(tree, nil, keys, nil)
	vp, statediff, err := SerializeProof(proof)
	if err != nil {
		t.Fatal(err)
	}
	t.Logf("serialized proof=%v", vp)

	cfg := GetConfig()
	if ok, err := VerifyVerkleProof(proof, cis, zis, yis, cfg); !ok || err != nil {
		t.Fatal("proof didn't verify")
	}

	dproof, err := DeserializeProof(vp, statediff)
	if err != nil {
		t.Fatal(err)
	}

	droot, err := PreStateTreeFromProof(dproof, r)
	if err != nil {
		t.Fatal(err)
	}
	pe, _, _, err := droot.GetProofItems(keys, nil)
	if err != nil {
		t.Fatal(err)
	}

	if ok, err := VerifyVerkleProof(dproof, pe.Cis, pe.Zis, pe.Yis, cfg); !ok || err != nil {
		t.Fatal("deserialized proof didn't verify")
	}
}

func BenchmarkEmptyHashCodeCachedPoint(b *testing.B) {
	_ = GetConfig()
	const codeHashVectorPosition = 3 // Defined by the spec.

	testCases := []struct {
		name     string
		hashCode string
	}{
		{name: "emptyHash", hashCode: "c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470"},
		{name: "nonEmptyHash", hashCode: "4242420186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470"},
	}

	for _, test := range testCases {
		b.Run(test.name, func(b *testing.B) {
			emptyHashCode, err := hex.DecodeString(test.hashCode)
			if err != nil {
				b.Fatalf("failed to decode empty hash code: %v", err)
			}

			values := make([][]byte, 256)
			values[codeHashVectorPosition] = emptyHashCode

			b.ReportAllocs()
			b.ResetTimer()
			for i := 0; i < b.N; i++ {
				_, _ = NewLeafNode(zeroKeyTest, values)
			}
		})
	}
}

func TestEmptyHashCodeCachedPoint(t *testing.T) {
	t.Parallel()

	_ = GetConfig()

	// Calculate the polynomial commitment of a vector only with the empty code hash.
	emptyHashCode, err := hex.DecodeString("c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470")
	if err != nil {
		t.Fatalf("failed to decode empty hash code: %v", err)
	}
	values := make([][]byte, NodeWidth)
	values[CodeHashVectorPosition] = emptyHashCode
	ln, _ := NewLeafNode(zeroKeyTest, values)

	// Compare the result (which used the cached point) with the expected result which was
	// calculated by a previous version of the library that didn't use a cached point.
	correctPointHex, _ := hex.DecodeString("02cc97eafa76087f079d21792f051561d5f14212d75df1e812b8214bc044bb0f")
	var correctPoint Point
	if err := correctPoint.SetBytes(correctPointHex); err != nil {
		t.Fatal(err)
	}
	if !ln.c1.Equal(&correctPoint) {
		t.Fatalf("expected %v, got %v", correctPoint, ln.c1)
	}
}

func TestBatchMigratedKeyValues(t *testing.T) {
	t.Parallel()

	_ = GetConfig()

	for _, treeInitialKeyValCount := range []int{0, 500, 1_000, 2_000, 5_000} {
		treeInitialKeyValCount := treeInitialKeyValCount
		t.Run(fmt.Sprintf("treeInitialKeyValCount=%d", treeInitialKeyValCount), func(t *testing.T) {
			t.Parallel()

			fmt.Printf("Assuming %d key/values touched by block execution:\n", treeInitialKeyValCount)
			for _, migrationKeyValueCount := range []int{1_000, 2_000, 5_000, 8_000} {
				iterations := 5
				var batchedDuration, unbatchedDuration time.Duration
				for i := 0; i < iterations; i++ {
					runtime.GC()

					// ***Insert the key pairs 'naively' ***
					rand := mRand.New(mRand.NewSource(42)) //skipcq: GSC-G404
					tree := genRandomTree(rand, treeInitialKeyValCount)
					randomKeyValues := genRandomKeyValues(rand, migrationKeyValueCount)

					now := time.Now()
					for _, kv := range randomKeyValues {
						if err := tree.Insert(kv.key, kv.value, nil); err != nil {
							t.Fatalf("failed to insert key: %v", err)
						}
					}
					unbatchedRoot := tree.Commit().Bytes()
					if _, err := tree.(*InternalNode).BatchSerialize(); err != nil {
						t.Fatalf("failed to serialize unbatched tree: %v", err)
					}
					unbatchedDuration += time.Since(now)

					// ***Insert the key pairs with optimized strategy & methods***
					rand = mRand.New(mRand.NewSource(42)) //skipcq: GSC-G404
					tree = genRandomTree(rand, treeInitialKeyValCount)
					randomKeyValues = genRandomKeyValues(rand, migrationKeyValueCount)

					now = time.Now()
					// Create LeafNodes in batch mode.
					nodeValues := make([]BatchNewLeafNodeData, 0, len(randomKeyValues))
					curr := BatchNewLeafNodeData{
						Stem:   KeyToStem(randomKeyValues[0].key),
						Values: map[byte][]byte{randomKeyValues[0].key[StemSize]: randomKeyValues[0].value},
					}
					for _, kv := range randomKeyValues[1:] {
						stem := KeyToStem(kv.key)
						if bytes.Equal(curr.Stem, stem) {
							curr.Values[kv.key[StemSize]] = kv.value
							continue
						}
						nodeValues = append(nodeValues, curr)
						curr = BatchNewLeafNodeData{
							Stem:   stem,
							Values: map[byte][]byte{kv.key[StemSize]: kv.value},
						}
					}
					// Append last remaining node.
					nodeValues = append(nodeValues, curr)

					// Create all leaves in batch mode so we can optimize cryptography operations.
					newLeaves, err := BatchNewLeafNode(nodeValues)
					if err != nil {
						t.Fatalf("failed to create leaves: %v", err)
					}

					if err := tree.(*InternalNode).InsertMigratedLeaves(newLeaves, nil); err != nil {
						t.Fatalf("failed to insert key: %v", err)
					}

					if err = tree.(*InternalNode).InsertMigratedLeaves(newLeaves, nil); err != nil {
						t.Fatalf("failed to insert key: %v", err)
					}
					batchedRoot := tree.Commit().Bytes()
					if _, err := tree.(*InternalNode).BatchSerialize(); err != nil {
						t.Fatalf("failed to serialize batched tree: %v", err)
					}
					batchedDuration += time.Since(now)

					if unbatchedRoot != batchedRoot {
						t.Fatalf("expected %x, got %x", unbatchedRoot, batchedRoot)
					}
				}

				fmt.Printf("\tIf %d extra key-values are migrated: unbatched %dms, batched %dms, %.02fx\n", migrationKeyValueCount, (unbatchedDuration / time.Duration(iterations)).Milliseconds(), (batchedDuration / time.Duration(iterations)).Milliseconds(), float64(unbatchedDuration.Milliseconds())/float64(batchedDuration.Milliseconds()))
			}
		})
	}
}

func genRandomTree(rand *mRand.Rand, keyValueCount int) VerkleNode {
	tree := New()
	for _, kv := range genRandomKeyValues(rand, keyValueCount) {
		if err := tree.Insert(kv.key, kv.value, nil); err != nil {
			panic(fmt.Sprintf("failed to insert key: %v", err))
		}
	}
	return tree
}

type keyValue struct {
	key   []byte
	value []byte
}

func genRandomKeyValues(rand *mRand.Rand, count int) []keyValue {
	ret := make([]keyValue, count)
	for i := 0; i < count; i++ {
		keyval := make([]byte, 64)
		rand.Read(keyval)
		ret[i].key = keyval[:KeySize]
		ret[i].value = keyval[KeySize:]
	}
	return ret
}

func BenchmarkBatchLeavesInsert(b *testing.B) {
	treeInitialKeyValCount := 1_000
	migrationKeyValueCount := 5_000

	_ = GetConfig()

	b.ReportAllocs()
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		b.StopTimer()
		rand := mRand.New(mRand.NewSource(42)) //skipcq: GSC-G404
		tree := genRandomTree(rand, treeInitialKeyValCount)
		randomKeyValues := genRandomKeyValues(rand, migrationKeyValueCount)
		b.StartTimer()

		// Create LeafNodes in batch mode.
		nodeValues := make([]BatchNewLeafNodeData, 0, len(randomKeyValues))
		curr := BatchNewLeafNodeData{
			Stem:   KeyToStem(randomKeyValues[0].key),
			Values: map[byte][]byte{randomKeyValues[0].key[StemSize]: randomKeyValues[0].value},
		}
		for _, kv := range randomKeyValues[1:] {
			stem := KeyToStem(kv.key)
			if bytes.Equal(curr.Stem, stem) {
				curr.Values[kv.key[StemSize]] = kv.value
				continue
			}
			nodeValues = append(nodeValues, curr)
			curr = BatchNewLeafNodeData{
				Stem:   stem,
				Values: map[byte][]byte{kv.key[StemSize]: kv.value},
			}
		}
		// Append last remaining node.
		nodeValues = append(nodeValues, curr)

		// Create all leaves in batch mode so we can optimize cryptography operations.
		newLeaves, err := BatchNewLeafNode(nodeValues)
		if err != nil {
			b.Fatalf("failed to batch-create leaf node: %v", err)
		}
		if err := tree.(*InternalNode).InsertMigratedLeaves(newLeaves, nil); err != nil {
			b.Fatalf("failed to insert key: %v", err)
		}

		if _, err := tree.(*InternalNode).BatchSerialize(); err != nil {
			b.Fatalf("failed to serialize batched tree: %v", err)
		}
	}
}

func TestManipulateChildren(t *testing.T) {
	t.Parallel()

	root := New()
	if err := root.Insert(ffx32KeyTest, testValue, nil); err != nil {
		t.Fatalf("failed to insert key: %v", err)
	}

	// Verify that Children() is returning what's expected.
	ln, ok := root.(*InternalNode).Children()[NodeWidth-1].(*LeafNode)
	if !ok {
		t.Fatalf("failed to get expected leaf node")
	}
	if !bytes.Equal(ln.stem, KeyToStem(ffx32KeyTest)) || !bytes.Equal(ln.values[NodeWidth-1], testValue) {
		t.Fatalf("failed to get expected leaf node stem and values")
	}

	// Verify SetChild()
	if err := root.(*InternalNode).SetChild(0, Empty{}); err != nil {
		t.Fatalf("failed to set child: %v", err)
	}
	if _, ok := root.(*InternalNode).Children()[0].(Empty); !ok {
		t.Fatalf("failed to set child")
	}

	// Verify SetChild() error case.
	if err := root.(*InternalNode).SetChild(NodeWidth, Empty{}); err == nil {
		t.Fatalf("expected error")
	}
}

func TestLeafNodeInsert(t *testing.T) {
	t.Parallel()

	keyTest := make([]byte, len(ffx32KeyTest))
	copy(keyTest, ffx32KeyTest)
	values := make([][]byte, NodeWidth)
	valIdx := 42
	values[valIdx] = testValue
	ln, err := NewLeafNode(KeyToStem(keyTest), values)
	if err != nil {
		t.Fatalf("failed to create leaf node: %v", err)
	}

	// Check we get the value correctly via Get(...).
	getValue, err := ln.Get(append(KeyToStem(keyTest), byte(valIdx)), nil)
	if err != nil {
		t.Fatalf("failed to get leaf node key/value: %v", err)
	}
	if !bytes.Equal(getValue, testValue) {
		t.Fatalf("failed to get expected value")
	}

	// Check we get the value correctly via Value(...).
	getValue = ln.Value(valIdx)
	if !bytes.Equal(getValue, testValue) {
		t.Fatalf("failed to get expected value")
	}

	// Check we get the correct value via Values().
	getValues := ln.Values()
	if !bytes.Equal(getValues[valIdx], testValue) {
		t.Fatalf("failed to get expected value")
	}

	// Check success case.
	ffx32KeyTest2 := append([]byte{}, keyTest...)
	ffx32KeyTest2[StemSize] = 11
	newValue := []byte("22222222222222222222222222222222")
	if err := ln.Insert(ffx32KeyTest2, newValue, nil); err != nil {
		t.Fatalf("failed to insert leaf node key/value: %v", err)
	}
	if !bytes.Equal(ln.values[valIdx], testValue) {
		t.Fatalf("the original value in other index should not be overwritten")
	}
	if !bytes.Equal(ln.values[11], newValue) {
		t.Fatalf("the inserted value isn't present")
	}

	// Check wrong *key* length.
	if err := ln.Insert(KeyToStem(ffx32KeyTest2), newValue, nil); err == nil {
		t.Fatalf("key with size 31 should not be accepted, keys must have length StemSize+1")
	}

	// Check insertion of key without the same stem.
	ffx32KeyTest3 := append([]byte{}, keyTest...)
	ffx32KeyTest3[StemSize] = 11
	ffx32KeyTest3[StemSize-5] = 99
	if err := ln.Insert(ffx32KeyTest3, newValue, nil); err == nil {
		t.Fatalf("inserting a key with a different stem should fail")
	}

	// Test that getting the hash returns an expected value.
	if h := ln.Hash(); h == nil {
		t.Fatalf("hash should not be nil")
	}
}

type randTest []randTestStep

type randTestStep struct {
	op    int
	key   []byte // for opInsert, opDelete, opGet
	value []byte // for opInsert
	err   error  // for debugging
}

const (
	opInsert = iota
	opDelete
	opGet
	opHash
	opCommit
	opProve
	numOps
)

// Generate implements the quick.Generator interface from testing/quick
// to generate random test cases.
func (randTest) Generate(r *mRand.Rand, size int) reflect.Value {
	var finishedFn = func() bool {
		if size == 0 {
			return true
		}
		size--
		return false
	}
	return reflect.ValueOf(generateSteps(finishedFn, r))
}

func generateSteps(finished func() bool, r io.Reader) randTest {
	var allKeys [][]byte
	var tmp = []byte{0}
	genKey := func() []byte {
		_, err := r.Read(tmp)
		if err != nil {
			panic(err)
		}

		// first 2 operations always create a new key, then 10% of the time
		// we create a new key or return an existing key otherwise.
		if len(allKeys) < 2 || tmp[0]%100 > 90 {
			// new key
			key := make([]byte, KeySize)
			_, err := r.Read(key)
			if err != nil {
				panic(err)
			}

			allKeys = append(allKeys, key)
			return key
		}
		// use existing key
		idx := int(tmp[0]) % len(allKeys)
		return allKeys[idx]
	}
	var steps randTest
	for !finished() {
		_, err := r.Read(tmp)
		if err != nil {
			panic(err)
		}

		step := randTestStep{op: int(tmp[0]) % numOps}
		switch step.op {
		case opInsert:
			step.key = genKey()
			step.value = make([]byte, 32)
			_, err := r.Read(step.value)
			if err != nil {
				panic(err)
			}
		case opGet, opDelete, opProve:
			step.key = genKey()
		}
		steps = append(steps, step)
	}
	return steps
}

// runRandTestBool coerces error to boolean, for use in quick.Check
func runRandTestBool(rt randTest) bool {
	return runRandTest(rt) == nil
}

func runRandTest(rt randTest) error {
	var (
		root   = New()
		keys   = [][]byte{}
		values = make(map[string]string)
		cfg    = GetConfig()
	)
	for i, step := range rt {
		switch step.op {
		case opInsert:
			if err := root.Insert(step.key, step.value, nil); err != nil {
				rt[i].err = err
			}
			keys = append(keys, step.key)
			values[string(step.key)] = string(step.value)
		case opDelete:
			if _, err := root.Delete(step.key, nil); err != nil {
				rt[i].err = err
			}
			delete(values, string(step.key))
		case opGet:
			v, err := root.Get(step.key, nil)
			want := values[string(step.key)]
			if string(v) != want {
				rt[i].err = fmt.Errorf("mismatch for key %#x, got %#x want %#x, err %v", step.key, v, want, err)
			}
		case opProve:
			if len(keys) == 0 {
				continue
			}
			root.Commit()
			proof, cis, zis, yis, _ := MakeVerkleMultiProof(root, nil, keys, nil)
			if ok, err := VerifyVerkleProof(proof, cis, zis, yis, cfg); !ok || err != nil {
				rt[i].err = fmt.Errorf("could not verify verkle proof: %s, err %v", ToDot(root), err)
			}
		// TODO: reconsider if we should avoid returning pointers in Hash() and Commit()
		case opHash:
			if hash := root.Hash(); hash == nil {
				rt[i].err = fmt.Errorf("hash is nil")
			}
		case opCommit:
			if comm := root.Commit(); comm == nil {
				rt[i].err = fmt.Errorf("commit is nil")
			}
		}
		// Abort the test on error.
		if rt[i].err != nil {
			return rt[i].err
		}
	}
	return nil
}

func TestRandom(t *testing.T) {
	t.Parallel()

	if err := quick.Check(runRandTestBool, nil); err != nil {
		if cerr, ok := err.(*quick.CheckError); ok {
			t.Fatalf("random test iteration %d failed: %s", cerr.Count, spew.Sdump(cerr.In))
		}
		t.Fatal(err)
	}
}

func TestRandomExtracted(t *testing.T) {
	t.Parallel()

	k1490, _ := hex.DecodeString("1490d65886f02ffa1a7dca88187dc8176ada23221c83e9f7da9e15c27d0b813d")
	val_k1490_0, _ := hex.DecodeString("3a8ee0370c16ba642123f80692ee63ade4477fce3bf0c68b638e189a014d8b04")
	k1413, _ := hex.DecodeString("1413dabef075cc47d380d740f7b24050568659c809830b1affbc765b7b651e1e")
	val_k1413_0, _ := hex.DecodeString("7469fa29e0d049e80eed8f99f2418bc36ebc3c3b3041515fd519701d60f86b9f")

	root := New()

	if err := root.Insert(k1490, val_k1490_0, nil); err != nil {
		t.Fatalf("error inserting key: %v", err)
	}
	if err := root.Insert(k1413, val_k1413_0, nil); err != nil {
		t.Fatalf("error inserting key: %v", err)
	}
	if _, err := root.Delete(k1413, nil); err != nil {
		t.Fatalf("error deleting key: %v", err)
	}

	val, err := root.Get(k1490, nil)
	if err != nil {
		t.Fatalf("error getting key: %v", err)
	}
	if !bytes.Equal(val, val_k1490_0) {
		t.Fatalf("got %x, expected %x", val, val_k1490_0)
	}
}