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I need to send a state-changing transaction to a Web3 contract object in my Truffle tests, which is hitting a fork of Kovan in my local ganache chain (ganache-cli --fork https://kovan.infura.io/v3/[api_key]@latest).

The contract I'm sending a transaction to is a Web3 contract object of an already-deployed contract on Kovan.

const theirContractABI = require("./abi/TheirContract");
const theirContractAddress = "0x123456789...";
const theirContract = new web3.eth.Contract(theirContractABI, theirContractAddress);

contract("MyContract", accounts => {
   it("can update a TheirContract property", async () => {
      await theirContract.methods.someFunction().send({ from: accounts[0] });
      ...
      assert(some condition);
   });
}

When I run this specific test, all I get is Error: Returned error: VM Exception while processing transaction: revert, and it's not produced by a falsified require statement. So, I tried using @0x/sol-trace. When I run yarn trace, I get

error InitializableAdminUpgradeabilityProxy.sol:3:1: ParserError: Source "/Users/slider/Desktop/myProject/node_modules/@openzeppelin/upgrades/contracts/upgradeability/BaseAdminUpgradeabilityProxy.sol" not found: File import callback not supported

import './BaseAdminUpgradeabilityProxy.sol';    
^------------------------------------------^

and

error InitializableAdminUpgradeabilityProxy.sol:4:1: ParserError: Source "/Users/slider/Desktop/myProject/node_modules/@openzeppelin/upgrades/contracts/upgradeability/InitializableUpgradeabilityProxy.sol" not found: File import callback not supported

import './InitializableUpgradeabilityProxy.sol';    
^------------------------------------------^

TheirContract imports @openzeppelin/upgrades/contracts/upgradeability/InitializableAdminUpgradeabilityProxy.sol, but I have the @openzeppelin/upgrades package installed, and BaseAdminUpgradeabilityProxy.sol & InitializableUpgradeabilityProxy.sol are indeed located in the same file within node_modules as InitializableAdminUpgradeabilityProxy.sol.

enter image description here

So, I'm fairly unsure of where the issue stems from and how to resolve it. Would greatly appreciate a point in the right direction.

  • As I've already explained in an answer to a previous question of yours, Truffle's logical contract object is different from Web3's logical contract object. So you should avoid using the latter within your Truffle tests. – goodvibration Jun 5 at 8:09
  • I'm able to use the Web3 contract method with an ERC20 contract and change an address balance in my Truffle tests. Is there a recommended way of Truffle-izing an already-deployed contract, or do I need to copy+paste the contract and all of its dependencies into their own files? – slider Jun 5 at 8:20
  • Also, I'm still curious as to the underlying issue, whether it's related to sending a transaction to a Web3 contract object or not... – slider Jun 5 at 8:22
  • Truffle-izing an already-deployed contract: const myContract = artifacts.require("MyContract").at(myContractAddress);. – goodvibration Jun 5 at 8:33
  • I'm trying to Truffle-ize someone else's contract, say MakerDAO. I could get its state by forking mainnet or Kovan in ganache-cli, but how would I reference it in my tests? Grab the contract code and copy+paste into its own file? There has to be a better way. – slider Jun 5 at 8:36
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Turns out, all I had to do was specify a gasLimit in my send() method!

From this:

await theirContract.methods.someFunction().send({ from: accounts[0] });

To this:

await theirContract.methods.someFunction().send({ from: accounts[0], gasLimit: 800000 });

And I can use the Web3 contract object to do so, which is the easiest way to reference an already-deployed contract that I'm currently aware of, because you can just grab the ABI and address from EtherScan, and fork mainnet/Kovan/etc to your local ganache chain!

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