core: restrict the muximum number of contents per block

pkg/consensus/prepare_request_test.go

@@ -3,7 +3,9 @@ package consensus
 import (
 	"testing"
 
+	"github.com/nspcc-dev/neo-go/pkg/core/block"
 	"github.com/nspcc-dev/neo-go/pkg/internal/random"
+	"github.com/nspcc-dev/neo-go/pkg/internal/testserdes"
 	"github.com/nspcc-dev/neo-go/pkg/util"
 	"github.com/stretchr/testify/require"
 )
@@ -30,3 +32,32 @@ func TestPrepareRequest_Setters(t *testing.T) {
 	p.SetTransactionHashes(hashes[:])
 	require.Equal(t, hashes[:], p.TransactionHashes())
 }
+
+func TestPrepareRequest_EncodeDecodeBinary(t *testing.T) {
+	t.Run("positive", func(t *testing.T) {
+		expected := &prepareRequest{
+			timestamp: 112,
+			nonce:     1325,
+			transactionHashes: []util.Uint256{
+				random.Uint256(),
+				random.Uint256(),
+			},
+		}
+		testserdes.EncodeDecodeBinary(t, expected, new(prepareRequest))
+	})
+
+	t.Run("bad hashes count", func(t *testing.T) {
+		hashes := make([]util.Uint256, block.MaxTransactionsPerBlock+1)
+		for i := range hashes {
+			hashes[i] = random.Uint256()
+		}
+		expected := &prepareRequest{
+			timestamp:         112,
+			nonce:             1325,
+			transactionHashes: hashes,
+		}
+		data, err := testserdes.EncodeBinary(expected)
+		require.NoError(t, err)
+		require.Error(t, testserdes.DecodeBinary(data, new(prepareRequest)))
+	})
+}