Pet Shop Test: contract code couldn't be stored

Issue

Following the pet shop tutorial, I ran into a gas limit issue running on my private blockchain. I asked on Gitter but could not find an answer about setting the right gas amount for running the tests. Apparently, there is enough gas to store the contract as I see it deployed on the blockchain (INFO [01-11|16:03:06] Submitted contract creation) but not enough to run the code. Truffle.js is supposed to have enough gas.

Steps to Reproduce

My blockchain is running with:

geth --datadir ./pethshop-chaindata --rpc --rpcaddr "localhost" --rpcport 8545 --rpcapi eth,web3,personal,net --rpccorsdomain "*" --nodiscover --unlock 0 --mine 1

A very minimal test file example that fails:

pragma solidity ^0.4.17;

import "truffle/Assert.sol";
import "truffle/DeployedAddresses.sol";
import "../contracts/Adoption.sol";

contract TestAdoption {
  Adoption adoption = Adoption(DeployedAddresses.Adoption());

  function testUserCanAdoptPet() public {
    uint returnedId = adoption.adopt(8);
     
    uint expected = 8;
  
    Assert.equal(returnedId, expected, "Adoption of pet ID 8 should be recorded.");
  }
}

My two migration files are the following:

migrations/1_initial_migration.js

var Migrations = artifacts.require("./Migrations.sol");

module.exports = function(deployer) {
  deployer.deploy(Migrations,  {gas: 10000});
};

migrations/2_deploy_contracts.js

var Adoption = artifacts.require("Adoption");

module.exports = function(deployer) {
  deployer.deploy(Adoption,   {gas: 10000});
};

truffle.js

module.exports = {
  networks: {
    development: {
      host: "127.0.0.1",
      port: 8545,
      network_id: "15",
      gas: 0x10000000,
      from: "0x0cddd..."
    }
  }
};

My private blockchain has the following gas limit: "gasLimit": "0x80000000"

Expected Behavior

The simple test should pass.

Actual Result

$ truffle test
  TestAdoption
    1) "before all" hook: prepare suite
  0 passing (5s)
  1 failing
  1) TestAdoption "before all" hook: prepare suite:
     Error: The contract code couldn't be stored, please check your gas amount.

Environment

• Operating System: Ubuntu 17.04
• Truffle version: Truffle v4.0.4 (core: 4.0.4)
• Ethereum client: 1.7.3-stable

[cgewecke]

@MathieuMailhos Finally got this to work 😃 I’ve used geths dev mode instead of the regular mining mode because it’s easier to set up for testing, comes with unlocked accounts, and is quite a bit faster. Without specifying any genesis or chain data you can just run:

geth --dev --dev.period 1 --rpc --targetgaslimit 0xfffffffff

In a separate terminal window run:

geth attach http://127.0.0.1:8545

> eth.getBlock('latest')
{
  difficulty: 2,
  extraData: "0xd883010703846765746887676f312e392e328664617277696e00000000000000fe78ce6ab95947c2b21f9811bb14798572b39f65fae94951cb3b5d6b7a6bdfa85211a36a774ff03c0dae2bec9299b99c4823b8a9ef435196b3471717ea36f4ee01",
  gasLimit: 6320079,
  gasUsed: 0,
  ... etc ..
}

Then set the gas field of the Truffle config to slightly less than the gasLimit of the most recent block:

networks: {
    geth: {
      host: "127.0.0.1",
      port: 8545,
      network_id: "*",
      gas: 6300000,
    }
  }

Then run truffle test --network geth.

Let me know if that doesn’t work for you.

[mmailhos]

@cgewecke Thanks so much, works like a charm!