github.com/sbrajchuk/go-ethereum@v1.9.7/accounts/abi/bind/backends/simulated_test.go (about)

     1  // Copyright 2019 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 backends_test
    18  
    19  import (
    20  	"context"
    21  	"math/big"
    22  	"testing"
    23  
    24  	ethereum "github.com/ethereum/go-ethereum"
    25  	"github.com/ethereum/go-ethereum/accounts/abi/bind"
    26  	"github.com/ethereum/go-ethereum/accounts/abi/bind/backends"
    27  	"github.com/ethereum/go-ethereum/common"
    28  	"github.com/ethereum/go-ethereum/core"
    29  	"github.com/ethereum/go-ethereum/core/types"
    30  	"github.com/ethereum/go-ethereum/crypto"
    31  )
    32  
    33  func TestSimulatedBackend(t *testing.T) {
    34  	var gasLimit uint64 = 8000029
    35  	key, _ := crypto.GenerateKey() // nolint: gosec
    36  	auth := bind.NewKeyedTransactor(key)
    37  	genAlloc := make(core.GenesisAlloc)
    38  	genAlloc[auth.From] = core.GenesisAccount{Balance: big.NewInt(9223372036854775807)}
    39  
    40  	sim := backends.NewSimulatedBackend(genAlloc, gasLimit)
    41  	defer sim.Close()
    42  
    43  	// should return an error if the tx is not found
    44  	txHash := common.HexToHash("2")
    45  	_, isPending, err := sim.TransactionByHash(context.Background(), txHash)
    46  
    47  	if isPending {
    48  		t.Fatal("transaction should not be pending")
    49  	}
    50  	if err != ethereum.NotFound {
    51  		t.Fatalf("err should be `ethereum.NotFound` but received %v", err)
    52  	}
    53  
    54  	// generate a transaction and confirm you can retrieve it
    55  	code := `6060604052600a8060106000396000f360606040526008565b00`
    56  	var gas uint64 = 3000000
    57  	tx := types.NewContractCreation(0, big.NewInt(0), gas, big.NewInt(1), common.FromHex(code))
    58  	tx, _ = types.SignTx(tx, types.HomesteadSigner{}, key)
    59  
    60  	err = sim.SendTransaction(context.Background(), tx)
    61  	if err != nil {
    62  		t.Fatal("error sending transaction")
    63  	}
    64  
    65  	txHash = tx.Hash()
    66  	_, isPending, err = sim.TransactionByHash(context.Background(), txHash)
    67  	if err != nil {
    68  		t.Fatalf("error getting transaction with hash: %v", txHash.String())
    69  	}
    70  	if !isPending {
    71  		t.Fatal("transaction should have pending status")
    72  	}
    73  
    74  	sim.Commit()
    75  	tx, isPending, err = sim.TransactionByHash(context.Background(), txHash)
    76  	if err != nil {
    77  		t.Fatalf("error getting transaction with hash: %v", txHash.String())
    78  	}
    79  	if isPending {
    80  		t.Fatal("transaction should not have pending status")
    81  	}
    82  
    83  }