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I have a smart contract that is dependent on a pre-deployed ERC-20 smart contract that is always deployed to the same address (in the local test network as well as public ones).

I want to override the address of a mock smart contract to be the same as that address, but documentation doesn’t provide any insight.

So the example smart contract I’m experimenting with is rudimentary example from the documentation:

pragma solidity ^0.6.2;  interface IERC20 {     function balanceOf(address account) external view returns (uint256); }  contract AmIRichAlready {     IERC20 private tokenContract;     uint public richness = 1000000 * 10 ** 18;      constructor (IERC20 _tokenContract) public {         tokenContract = _tokenContract;     }      function check() public view returns (bool) {         uint balance = tokenContract.balanceOf(msg.sender);         return balance > richness;     } } 

And the test setup is as follows:

import { expect, use } from "chai" import { Contract, utils, Wallet } from "ethers" import {   deployContract,   deployMockContract,   MockProvider,   solidity, } from "ethereum-waffle"  import IERC20 from "../build/IERC20.json" import AmIRichAlready from "../build/AmIRichAlready.json"  use(solidity)  describe("Am I Rich Already", () => {   let mockERC20: Contract   let contract: Contract   let wallet: Wallet    beforeEach(async () => {     ;[wallet] = new MockProvider().getWallets()     mockERC20 = await deployMockContract(wallet, IERC20.abi)     contract = await deployContract(wallet, AmIRichAlready, [mockERC20.address])   }) }) 

So I’d like to assign a certain address for the mockERC20, so that calling a method at that address will be handled by the mock smart contract.

I’ve tried digging through the source code, but no luck so far. Does anyone have any clue wether or not this is even possible?