github.com/marconiprotocol/go-methereum-lite@v0.0.0-20190918214227-3cd8b06fcf99/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  	"path/filepath"
    24  	"testing"
    25  
    26  	"github.com/MarconiProtocol/go-methereum-lite/common"
    27  	"github.com/MarconiProtocol/go-methereum-lite/common/math"
    28  	"github.com/MarconiProtocol/go-methereum-lite/core/types"
    29  	"github.com/MarconiProtocol/go-methereum-lite/params"
    30  )
    31  
    32  type difficultyTest struct {
    33  	ParentTimestamp    uint64
    34  	ParentDifficulty   *big.Int
    35  	CurrentTimestamp   uint64
    36  	CurrentBlocknumber *big.Int
    37  	CurrentDifficulty  *big.Int
    38  	ParentUncles       common.Hash
    39  }
    40  
    41  func (d *difficultyTest) UnmarshalJSON(b []byte) (err error) {
    42  	var ext struct {
    43  		ParentTimestamp    string
    44  		ParentDifficulty   string
    45  		CurrentTimestamp   string
    46  		CurrentBlocknumber string
    47  		CurrentDifficulty  string
    48  		ParentUncles       string
    49  	}
    50  	if err := json.Unmarshal(b, &ext); err != nil {
    51  		return err
    52  	}
    53  
    54  	d.ParentTimestamp = math.MustParseUint64(ext.ParentTimestamp)
    55  	d.ParentDifficulty = math.MustParseBig256(ext.ParentDifficulty)
    56  	d.CurrentTimestamp = math.MustParseUint64(ext.CurrentTimestamp)
    57  	d.CurrentBlocknumber = math.MustParseBig256(ext.CurrentBlocknumber)
    58  	d.CurrentDifficulty = math.MustParseBig256(ext.CurrentDifficulty)
    59  	d.ParentUncles = common.HexToHash(ext.ParentUncles)
    60  
    61  	return nil
    62  }
    63  
    64  func TestCalcDifficulty(t *testing.T) {
    65  	file, err := os.Open(filepath.Join("..", "..", "tests", "testdata_marconi", "BasicTests", "difficulty.json"))
    66  	if err != nil {
    67  		t.Fatal(err)
    68  	}
    69  	defer file.Close()
    70  
    71  	tests := make(map[string]difficultyTest)
    72  	err = json.NewDecoder(file).Decode(&tests)
    73  	if err != nil {
    74  		t.Fatal(err)
    75  	}
    76  
    77  	config := &params.ChainConfig{HomesteadBlock: big.NewInt(1150000)}
    78  
    79  	for name, test := range tests {
    80  		number := new(big.Int).Sub(test.CurrentBlocknumber, big.NewInt(1))
    81  		difficulty := CalcDifficulty(config, test.CurrentTimestamp, &types.Header{
    82  			Number:     number,
    83  			Time:       new(big.Int).SetUint64(test.ParentTimestamp),
    84  			Difficulty: test.ParentDifficulty,
    85  			UncleHash:  test.ParentUncles,
    86  		})
    87  		if difficulty.Cmp(test.CurrentDifficulty) != 0 {
    88  			t.Error(name, "failed. Expected", test.CurrentDifficulty, "and calculated", difficulty)
    89  		}
    90  	}
    91  }