github.com/ylsGit/go-ethereum@v1.6.5/consensus/ethash/consensus_test.go (about)

     1  // Copyright 2017 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package ethash
    18  
    19  import (
    20  	"encoding/json"
    21  	"math/big"
    22  	"os"
    23  	"testing"
    24  
    25  	"github.com/ethereum/go-ethereum/common/math"
    26  	"github.com/ethereum/go-ethereum/core/types"
    27  	"github.com/ethereum/go-ethereum/params"
    28  )
    29  
    30  type diffTest struct {
    31  	ParentTimestamp    uint64
    32  	ParentDifficulty   *big.Int
    33  	CurrentTimestamp   uint64
    34  	CurrentBlocknumber *big.Int
    35  	CurrentDifficulty  *big.Int
    36  }
    37  
    38  func (d *diffTest) UnmarshalJSON(b []byte) (err error) {
    39  	var ext struct {
    40  		ParentTimestamp    string
    41  		ParentDifficulty   string
    42  		CurrentTimestamp   string
    43  		CurrentBlocknumber string
    44  		CurrentDifficulty  string
    45  	}
    46  	if err := json.Unmarshal(b, &ext); err != nil {
    47  		return err
    48  	}
    49  
    50  	d.ParentTimestamp = math.MustParseUint64(ext.ParentTimestamp)
    51  	d.ParentDifficulty = math.MustParseBig256(ext.ParentDifficulty)
    52  	d.CurrentTimestamp = math.MustParseUint64(ext.CurrentTimestamp)
    53  	d.CurrentBlocknumber = math.MustParseBig256(ext.CurrentBlocknumber)
    54  	d.CurrentDifficulty = math.MustParseBig256(ext.CurrentDifficulty)
    55  
    56  	return nil
    57  }
    58  
    59  func TestCalcDifficulty(t *testing.T) {
    60  	file, err := os.Open("../../tests/files/BasicTests/difficulty.json")
    61  	if err != nil {
    62  		t.Fatal(err)
    63  	}
    64  	defer file.Close()
    65  
    66  	tests := make(map[string]diffTest)
    67  	err = json.NewDecoder(file).Decode(&tests)
    68  	if err != nil {
    69  		t.Fatal(err)
    70  	}
    71  
    72  	config := &params.ChainConfig{HomesteadBlock: big.NewInt(1150000)}
    73  	for name, test := range tests {
    74  		number := new(big.Int).Sub(test.CurrentBlocknumber, big.NewInt(1))
    75  		diff := CalcDifficulty(config, test.CurrentTimestamp, &types.Header{
    76  			Number:     number,
    77  			Time:       new(big.Int).SetUint64(test.ParentTimestamp),
    78  			Difficulty: test.ParentDifficulty,
    79  		})
    80  		if diff.Cmp(test.CurrentDifficulty) != 0 {
    81  			t.Error(name, "failed. Expected", test.CurrentDifficulty, "and calculated", diff)
    82  		}
    83  	}
    84  }