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