[Ethereum] Truffle solidity tests: out of gas & exceeds block gas limit

gasout-of-gastestingtruffle

I am trying to run some basic test w/ my contract, written with Truffle's Solidity tests (tests written in Solidity).

When runninng truffle test, I get

Error: VM Exception while processing transaction: out of gas

Note: This is caused by the contract constructor new ..., which is indeed doing a lot of things. And I can't break anything down in my code.

Is there any way to get this working with a test written in Solidity? Is there a way to configure the amount of gas the test contract has available?

—

UPDATE:

Actually I figured out changing the gas config value in truffle.js does have an effect. Yet, I am hitting now another roadblock

Error: Error: Exceeds block gas limit

I guess that I have no other choice than optimising the deployment (thus, the constructor) of my contract so as to make it lighter?

Best Answer

I ran into the same issue today - but for me the issue was, that my test-file.sol was seemingly too large. So I split up my tests into two files, and all the tests ran just fine again.

It probably makes sense anyways to structure test-files in multiple smaller suites than one big file that you'd have to scroll through.

Related Solutions

Truffle Testing – How to Access Deployed Contract’s Address in Truffle JS Tests

const contract = require('truffle-contract');
const TokenArtifact = require('./../../build/contracts/YourToken.json');

var Token = contract(TokenArtifact);
Token.setProvider(window.web3.currentProvider);
var tokenInstance = await Token.deployed();

Now,

tokenInstance.address

Will give you, your deployed contract's address.

[Ethereum] Truffle contract deployment either exceeds block gas limit or out of gas

Answer(I found out the answer by myself):

The gas parameter in truffle.js is the maximum amount you are willing to pay for deploys. It is not the chain's block gas limit! So doesn't matter how big that is, if the block gas limit is smaller than the gas you attach to a transaction, you will always get the same error "Exceeds block gas limit". Which also explains why it worked in Remix not on my local chain.

Now the question is how do I change the default block gas limit for the truffle develop local chain? I don't see the genesis.json file. The hardcoded block gas limit seems to be around 6700000.

I assume the solutions are below: 1. change the hardcoded truffle core setting to allow higher block gas limit. 2. break down the contract to make it lighter. 3. connect truffle to a local network you set up yourself or to the live testnet, which may or may not allow the gas required by the contract. So always test first using the mainnet gas requirements.

Any further help is much appreciated!

Best Answer

Related Solutions

Truffle Testing – How to Access Deployed Contract’s Address in Truffle JS Tests

[Ethereum] Truffle contract deployment either exceeds block gas limit or out of gas

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