7ac618d339
TxFee calculates pre-HF4 fees as sum(inputs) - sum(outputs) with overflow detection. Coinbase transactions return zero fee. Co-Authored-By: Charon <charon@lethean.io>
73 lines
1.6 KiB
Go
73 lines
1.6 KiB
Go
// Copyright (c) 2017-2026 Lethean (https://lt.hn)
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//
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// Licensed under the European Union Public Licence (EUPL) version 1.2.
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// SPDX-License-Identifier: EUPL-1.2
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//go:build !integration
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package consensus
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import (
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"testing"
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"forge.lthn.ai/core/go-blockchain/types"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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func TestTxFee_Good(t *testing.T) {
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// Coinbase tx: fee is 0.
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coinbase := &types.Transaction{
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Version: types.VersionInitial,
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Vin: []types.TxInput{types.TxInputGenesis{Height: 1}},
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}
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fee, err := TxFee(coinbase)
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require.NoError(t, err)
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assert.Equal(t, uint64(0), fee)
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// Normal v1 tx: fee = inputs - outputs.
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tx := &types.Transaction{
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Version: types.VersionPreHF4,
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Vin: []types.TxInput{
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types.TxInputToKey{Amount: 100},
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types.TxInputToKey{Amount: 50},
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},
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Vout: []types.TxOutput{
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types.TxOutputBare{Amount: 120},
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},
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}
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fee, err = TxFee(tx)
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require.NoError(t, err)
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assert.Equal(t, uint64(30), fee)
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}
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func TestTxFee_Bad(t *testing.T) {
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// Outputs exceed inputs.
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tx := &types.Transaction{
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Version: types.VersionPreHF4,
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Vin: []types.TxInput{
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types.TxInputToKey{Amount: 50},
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},
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Vout: []types.TxOutput{
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types.TxOutputBare{Amount: 100},
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},
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}
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_, err := TxFee(tx)
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assert.ErrorIs(t, err, ErrNegativeFee)
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}
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func TestTxFee_Ugly(t *testing.T) {
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// Input amounts that would overflow uint64.
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tx := &types.Transaction{
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Version: types.VersionPreHF4,
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Vin: []types.TxInput{
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types.TxInputToKey{Amount: ^uint64(0)},
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types.TxInputToKey{Amount: 1},
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},
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Vout: []types.TxOutput{
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types.TxOutputBare{Amount: 1},
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},
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}
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_, err := TxFee(tx)
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assert.ErrorIs(t, err, ErrInputOverflow)
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}
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