dcrd/policy_test.go

// Copyright (c) 2013-2015 The btcsuite developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.

package main

import (
	"math/big"
	"testing"

	"github.com/decred/dcrd/chaincfg/chainec"
	"github.com/decred/dcrd/txscript"
	"github.com/decred/dcrd/wire"
	"github.com/decred/dcrutil"
)

// TestCalcMinRequiredTxRelayFee tests the calcMinRequiredTxRelayFee API.
func TestCalcMinRequiredTxRelayFee(t *testing.T) {
	tests := []struct {
		name     string         // test description.
		size     int64          // Transaction size in bytes.
		relayFee dcrutil.Amount // minimum relay transaction fee.
		want     int64          // Expected fee.
	}{
		{
			"zero value with default minimum relay fee",
			0,
			minTxRelayFeeMainNet,
			int64(minTxRelayFeeMainNet),
		},
		{
			"1000 bytes with default minimum relay fee",
			1000,
			minTxRelayFeeMainNet,
			int64(minTxRelayFeeMainNet),
		},
		{
			"max standard tx size with default minimum relay fee",
			maxStandardTxSize,
			minTxRelayFeeMainNet,
			100000000,
		},
		{
			"max standard tx size with max satoshi relay fee",
			maxStandardTxSize,
			dcrutil.MaxAmount,
			dcrutil.MaxAmount,
		},
	}

	for _, test := range tests {
		got := calcMinRequiredTxRelayFee(test.size, int64(test.relayFee))
		if got != test.want {
			t.Errorf("TestCalcMinRequiredTxRelayFee test '%s' "+
				"failed: got %v want %v", test.name, got,
				test.want)
			continue
		}
	}
}

// TestCheckPkScriptStandard tests the checkPkScriptStandard API.
func TestCheckPkScriptStandard(t *testing.T) {
	var pubKeys [][]byte
	for i := 0; i < 4; i++ {
		pk := chainec.Secp256k1.NewPrivateKey(big.NewInt(int64(chainec.ECTypeSecp256k1)))
		pubKeys = append(pubKeys, chainec.Secp256k1.NewPublicKey(pk.Public()).SerializeCompressed())
	}

	tests := []struct {
		name       string // test description.
		script     *txscript.ScriptBuilder
		isStandard bool
	}{
		{
			"key1 and key2",
			txscript.NewScriptBuilder().AddOp(txscript.OP_2).
				AddData(pubKeys[0]).AddData(pubKeys[1]).
				AddOp(txscript.OP_2).AddOp(txscript.OP_CHECKMULTISIG),
			true,
		},
		{
			"key1 or key2",
			txscript.NewScriptBuilder().AddOp(txscript.OP_1).
				AddData(pubKeys[0]).AddData(pubKeys[1]).
				AddOp(txscript.OP_2).AddOp(txscript.OP_CHECKMULTISIG),
			true,
		},
		{
			"escrow",
			txscript.NewScriptBuilder().AddOp(txscript.OP_2).
				AddData(pubKeys[0]).AddData(pubKeys[1]).
				AddData(pubKeys[2]).
				AddOp(txscript.OP_3).AddOp(txscript.OP_CHECKMULTISIG),
			true,
		},
		{
			"one of four",
			txscript.NewScriptBuilder().AddOp(txscript.OP_1).
				AddData(pubKeys[0]).AddData(pubKeys[1]).
				AddData(pubKeys[2]).AddData(pubKeys[3]).
				AddOp(txscript.OP_4).AddOp(txscript.OP_CHECKMULTISIG),
			false,
		},
		{
			"malformed1",
			txscript.NewScriptBuilder().AddOp(txscript.OP_3).
				AddData(pubKeys[0]).AddData(pubKeys[1]).
				AddOp(txscript.OP_2).AddOp(txscript.OP_CHECKMULTISIG),
			false,
		},
		{
			"malformed2",
			txscript.NewScriptBuilder().AddOp(txscript.OP_2).
				AddData(pubKeys[0]).AddData(pubKeys[1]).
				AddOp(txscript.OP_3).AddOp(txscript.OP_CHECKMULTISIG),
			false,
		},
		{
			"malformed3",
			txscript.NewScriptBuilder().AddOp(txscript.OP_0).
				AddData(pubKeys[0]).AddData(pubKeys[1]).
				AddOp(txscript.OP_2).AddOp(txscript.OP_CHECKMULTISIG),
			false,
		},
		{
			"malformed4",
			txscript.NewScriptBuilder().AddOp(txscript.OP_1).
				AddData(pubKeys[0]).AddData(pubKeys[1]).
				AddOp(txscript.OP_0).AddOp(txscript.OP_CHECKMULTISIG),
			false,
		},
		{
			"malformed5",
			txscript.NewScriptBuilder().AddOp(txscript.OP_1).
				AddData(pubKeys[0]).AddData(pubKeys[1]).
				AddOp(txscript.OP_CHECKMULTISIG),
			false,
		},
		{
			"malformed6",
			txscript.NewScriptBuilder().AddOp(txscript.OP_1).
				AddData(pubKeys[0]).AddData(pubKeys[1]),
			false,
		},
	}

	for _, test := range tests {
		script, err := test.script.Script()
		if err != nil {
			t.Fatalf("TestCheckPkScriptStandard test '%s' "+
				"failed: %v", test.name, err)
			continue
		}
		scriptClass := txscript.GetScriptClass(0, script)
		got := checkPkScriptStandard(0, script, scriptClass)
		if (test.isStandard && got != nil) ||
			(!test.isStandard && got == nil) {

			t.Fatalf("TestCheckPkScriptStandard test '%s' failed",
				test.name)
			return
		}
	}
}

// TestDust tests the isDust API.
func TestDust(t *testing.T) {
	pkScript := []byte{0x76, 0xa9, 0x14, 0xb1, 0x2d, 0x0f, 0xca,
		0xeb, 0x46, 0x14, 0xa3, 0x4b, 0x1e, 0x88, 0x61, 0xe7,
		0x55, 0x4f, 0xd4, 0x13, 0xf7, 0xa6, 0x47, 0x88, 0xac}

	tests := []struct {
		name     string // test description
		txOut    wire.TxOut
		relayFee dcrutil.Amount // minimum relay transaction fee.
		isDust   bool
	}{
		{
			// Any value is allowed with a zero relay fee.
			"zero value with zero relay fee",
			wire.TxOut{Value: 0, Version: 0, PkScript: pkScript},
			0,
			false,
		},
		{
			// Zero value is dust with any relay fee"
			"zero value with very small tx fee",
			wire.TxOut{Value: 0, Version: 0, PkScript: pkScript},
			1,
			true,
		},
		{
			"25 byte public key script with value 602",
			wire.TxOut{Value: 602, Version: 0, PkScript: pkScript},
			1000,
			true,
		},
		{
			"25 byte public key script with value 603",
			wire.TxOut{Value: 603, Version: 0, PkScript: pkScript},
			1000,
			false,
		},
		{
			// Maximum allowed value is never dust.
			"max satoshi amount is never dust",
			wire.TxOut{Value: dcrutil.MaxAmount, Version: 0, PkScript: pkScript},
			dcrutil.MaxAmount,
			false,
		},
		{
			// Maximum int64 value causes overflow.
			"maximum int64 value",
			wire.TxOut{Value: 1<<63 - 1, Version: 0, PkScript: pkScript},
			1<<63 - 1,
			true,
		},
		{
			// Unspendable pkScript due to an invalid public key
			// script.
			"unspendable pkScript",
			wire.TxOut{Value: 5000, Version: 0, PkScript: []byte{0x01}},
			0, // no relay fee
			true,
		},
	}
	for _, test := range tests {
		res := isDust(&test.txOut, test.relayFee)
		if res != test.isDust {
			t.Fatalf("Dust test '%s' failed: want %v got %v",
				test.name, test.isDust, res)
			continue
		}
	}
}