用华夫饼读取合同余额

Question

上下文

在采用华夫饼干示例后，我在读取使用华夫饼干中的单元测试生成的合同余额时遇到了一些困难。

测试文件

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';
import SolveContract from '../build/SolveContract.json';
import RandomNumberConsumer from '../build/RandomNumberConsumer.json';
use(solidity);
describe('Am I Rich Already', () => {
// Declare contracts
let mockERC20: Contract;
let askRootContract: Contract;
let solveRootContract: Contract;
let vrfContract: Contract;

// Declare wallets
let mockWallet: Wallet;
let askRootWallet: Wallet;
let solveRootWallet: Wallet;
let vrfWallet: Wallet;
beforeEach(async () => {

// generate random wallets or random origin 
//const [mockWallet, askRootWallet, solveRootWallet, vrfWallet] = Wallet.createRandom();
//const original = Wallet.createRandom();

// specify wallet balances
const provider = new MockProvider(
{
ganacheOptions: {
// The private key is used to generate the four respective wallet addresses.
accounts: [
{balance: '16862680000000000001', secretKey: '0x706618637b8ca922f6290ce1ecd4c31247e9ab75cf0530a0ac95c0332173d7c1'}, 
{balance: '16862680000000000002', secretKey: '0x706618637b8ca922f6290ce1ecd4c31247e9ab75cf0530a0ac95c0332173d7c2'}, 
{balance: '16862680000000000003', secretKey: '0x706618637b8ca922f6290ce1ecd4c31247e9ab75cf0530a0ac95c0332173d7c3'},
{balance: '16862680000000000004', secretKey: '0x706618637b8ca922f6290ce1ecd4c31247e9ab75cf0530a0ac95c0332173d7c4'}
]
}
}
);

[mockWallet, askRootWallet, solveRootWallet, vrfWallet] = provider.getWallets();
mockERC20 = await deployMockContract(mockWallet, IERC20.abi);
askRootContract = await deployContract(askRootWallet, AmIRichAlready, [mockERC20.address]);
solveRootContract = await deployContract(solveRootWallet, SolveContract, [mockERC20.address]);
vrfContract = await deployContract(vrfWallet, RandomNumberConsumer);
});
// custom test in AskRoot contract
it('checks askRootContract address is returned correctly', async () => {
expect(await askRootContract.getAddressThis()).to.be.equal('0x82A666453d8aa239eEBE4578E83cD0988D62c83F');
});

// custom test in AskRoot contract
it('checks askRootWallet address balance is returned correctly', async () => {
expect(await askRootContract.getAddressThisBalance()).to.be.equal(9001);
}); 
});

合同示例

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.4.16 <0.9.0;
// Example contract of a TestContract.
contract SolveContract {

bool forTestingPurposes;    // Boolean to run test on this contract

TemplateTestContract testContract;  // Create variable for the testContract which needs to be solved.
address payable owner;              // Create variable for the owner which solves the test contract.
// Constructor to initialise the contract variables.
constructor(address testAddress) public payable {
testContract = TemplateTestContract(testAddress);   // Initialise the testContract variable.
owner = msg.sender;                                 // Initialise the owner of the contract to be the creator of the contract.
}

// Function to solve the testContract.
function solve() public payable returns(uint256){
testContract.differentFunctionName(owner);
return owner.balance;
}
// Example of the main function which solves the testContract.
// Calculates the squre root function.
function main(uint x) pure public returns(uint y) {
uint z = (x + 1) / 2;
y = x;
while (z < y) {
y = z;
z = (x / z + z) / 2;
}
}


// Getter function for the Ownership.
function getOwner() public view returns (address) { 
return owner;
}

// Getter function for the address(this).
function getAddressThis() public view returns (address) { 
return address(this);
}

// Getter function for the balance of the contract.
function getBalance() public view returns (uint) {
//return address(this).balance;
//testAddress.balance;
return owner.balance;
}

// Getter function for the forTestingPurposes boolean.
function getForTestingPurposes() public view returns (bool){   
return forTestingPurposes;
}

}
// TemplateTestContract so the SolveContract knows the structure of the testContract.
abstract contract TemplateTestContract {
function differentFunctionName(address payable hunter) public virtual;
}

测试输出

1) checks askRootWallet address balance is returned correctly
AssertionError: Expected "0" to be equal 9001
at Context.it (test/AmIRichAlready.test.ts:53:76)
at process._tickCallback (internal/process/next_tick.js:68:7)

问题

如何在华夫饼测试中设置并读取特定合同的钱包地址余额？

Answer 1

您的测试脚本正在调用函数getAddressThisBalance()，但该函数未在合同中定义。

对不存在的约定函数执行调用(只读，无事务)时，不同的JSON-RPC包装器的行为不同。有些返回undefined，有些抛出异常，Waffle似乎返回了一个可以类型化为0的值。

解决方案：

1. 统一合约函数getBalance()和调用getAddressThisBalance()的JS片段。例如，将JS调用更改为getBalance()。

2. 取消对getBalance()合同函数中return address(this).balance;行的注释。此表达式返回合同的当前余额。