86 lines
2.6 KiB
Go
86 lines
2.6 KiB
Go
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// Copyright 2017 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package ethash
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import (
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"encoding/json"
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"math/big"
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"os"
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"path/filepath"
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"testing"
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"github.com/ethereum/go-ethereum/common/math"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/params"
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)
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type diffTest struct {
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ParentTimestamp uint64
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ParentDifficulty *big.Int
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CurrentTimestamp uint64
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CurrentBlocknumber *big.Int
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CurrentDifficulty *big.Int
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}
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func (d *diffTest) UnmarshalJSON(b []byte) (err error) {
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var ext struct {
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ParentTimestamp string
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ParentDifficulty string
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CurrentTimestamp string
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CurrentBlocknumber string
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CurrentDifficulty string
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}
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if err := json.Unmarshal(b, &ext); err != nil {
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return err
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}
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d.ParentTimestamp = math.MustParseUint64(ext.ParentTimestamp)
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d.ParentDifficulty = math.MustParseBig256(ext.ParentDifficulty)
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d.CurrentTimestamp = math.MustParseUint64(ext.CurrentTimestamp)
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d.CurrentBlocknumber = math.MustParseBig256(ext.CurrentBlocknumber)
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d.CurrentDifficulty = math.MustParseBig256(ext.CurrentDifficulty)
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return nil
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}
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func TestCalcDifficulty(t *testing.T) {
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file, err := os.Open(filepath.Join("..", "..", "tests", "testdata", "BasicTests", "difficulty.json"))
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if err != nil {
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t.Skip(err)
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}
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defer file.Close()
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tests := make(map[string]diffTest)
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err = json.NewDecoder(file).Decode(&tests)
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if err != nil {
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t.Fatal(err)
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}
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config := ¶ms.ChainConfig{HomesteadBlock: big.NewInt(1150000)}
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for name, test := range tests {
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number := new(big.Int).Sub(test.CurrentBlocknumber, big.NewInt(1))
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diff := CalcDifficulty(config, test.CurrentTimestamp, &types.Header{
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Number: number,
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Time: new(big.Int).SetUint64(test.ParentTimestamp),
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Difficulty: test.ParentDifficulty,
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})
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if diff.Cmp(test.CurrentDifficulty) != 0 {
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t.Error(name, "failed. Expected", test.CurrentDifficulty, "and calculated", diff)
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}
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}
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}
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