github.com/carter-ya/go-ethereum@v0.0.0-20230628080049-d2309be3983b/cmd/geth/genesis_test.go (about)

     1  // Copyright 2016 The go-ethereum Authors
     2  // This file is part of go-ethereum.
     3  //
     4  // go-ethereum is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU 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  // go-ethereum 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 General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU General Public License
    15  // along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package main
    18  
    19  import (
    20  	"os"
    21  	"path/filepath"
    22  	"testing"
    23  )
    24  
    25  var customGenesisTests = []struct {
    26  	genesis string
    27  	query   string
    28  	result  string
    29  }{
    30  	// Genesis file with an empty chain configuration (ensure missing fields work)
    31  	{
    32  		genesis: `{
    33  			"alloc"      : {},
    34  			"coinbase"   : "0x0000000000000000000000000000000000000000",
    35  			"difficulty" : "0x20000",
    36  			"extraData"  : "",
    37  			"gasLimit"   : "0x2fefd8",
    38  			"nonce"      : "0x0000000000001338",
    39  			"mixhash"    : "0x0000000000000000000000000000000000000000000000000000000000000000",
    40  			"parentHash" : "0x0000000000000000000000000000000000000000000000000000000000000000",
    41  			"timestamp"  : "0x00",
    42  			"config"     : {}
    43  		}`,
    44  		query:  "eth.getBlock(0).nonce",
    45  		result: "0x0000000000001338",
    46  	},
    47  	// Genesis file with specific chain configurations
    48  	{
    49  		genesis: `{
    50  			"alloc"      : {},
    51  			"coinbase"   : "0x0000000000000000000000000000000000000000",
    52  			"difficulty" : "0x20000",
    53  			"extraData"  : "",
    54  			"gasLimit"   : "0x2fefd8",
    55  			"nonce"      : "0x0000000000001339",
    56  			"mixhash"    : "0x0000000000000000000000000000000000000000000000000000000000000000",
    57  			"parentHash" : "0x0000000000000000000000000000000000000000000000000000000000000000",
    58  			"timestamp"  : "0x00",
    59  			"config"     : {
    60  				"homesteadBlock" : 42,
    61  				"daoForkBlock"   : 141,
    62  				"daoForkSupport" : true
    63  			}
    64  		}`,
    65  		query:  "eth.getBlock(0).nonce",
    66  		result: "0x0000000000001339",
    67  	},
    68  }
    69  
    70  // Tests that initializing Geth with a custom genesis block and chain definitions
    71  // work properly.
    72  func TestCustomGenesis(t *testing.T) {
    73  	for i, tt := range customGenesisTests {
    74  		// Create a temporary data directory to use and inspect later
    75  		datadir := t.TempDir()
    76  
    77  		// Initialize the data directory with the custom genesis block
    78  		json := filepath.Join(datadir, "genesis.json")
    79  		if err := os.WriteFile(json, []byte(tt.genesis), 0600); err != nil {
    80  			t.Fatalf("test %d: failed to write genesis file: %v", i, err)
    81  		}
    82  		runGeth(t, "--datadir", datadir, "init", json).WaitExit()
    83  
    84  		// Query the custom genesis block
    85  		geth := runGeth(t, "--networkid", "1337", "--syncmode=full", "--cache", "16",
    86  			"--datadir", datadir, "--maxpeers", "0", "--port", "0", "--authrpc.port", "0",
    87  			"--nodiscover", "--nat", "none", "--ipcdisable",
    88  			"--exec", tt.query, "console")
    89  		geth.ExpectRegexp(tt.result)
    90  		geth.ExpectExit()
    91  	}
    92  }