测试 safeMint function

Question

我正在尝试为下面的 safeMint function 成功编写单元测试。

这是我目前的测试：

const assert = require("assert");
const { accounts } = require("@openzeppelin/test-environment");
const ComNFT = artifacts.require("ComNFT");
const { expect } = require("chai");

// describe('ComNFT', () => {
// let accounts;
let comNFT;

beforeEach(async () => {
  accounts = await web3.eth.getAccounts();
  comNFT = await ComNFT.new({ from: accounts[0] });
  //comNFT = await ComNFT.at("");
  // console.log(comNFT.address);
});


  it('should fail when called by a non-owner account', async () => {
    try {
      await web3.eth.sendTransaction({
        from: accounts[1], // The non-owner account
        to: comNFT.address, // The contract address
        data: comNFT.methods.safeMint(accounts[1], 'token URI').encodeABI() // The function call and arguments, encoded as ABI
      });
      assert.fail('Expected error not thrown');
    } catch (error) {
      assert(error.message.includes('onlyOwner'), 'Expected "onlyOwner" error message not found');
    }
  });

  it('should be able to mint a new token', async () => {
    await web3.eth.sendTransaction({
      from: accounts[0], // The owner account
      to: comNFT.address, // The contract address
      data: comNFT.methods.safeMint(accounts[1], 'token URI').encodeABI() // The function call and arguments, encoded as ABI
    });

    const tokenURI = await comNFT.tokenURI(1); // Assume the token ID is 1
    assert.equal(tokenURI, 'token URI');
  });

    function safeMint(address to, string memory uri) public onlyOwner {
        uint256 tokenId = _tokenIdCounter.current();
        _tokenIdCounter.increment();
        _safeMint(to, tokenId);
        _setTokenURI(tokenId, uri);
    }

在我运行 npx truffle test“1)”之后，我收到一条失败消息“在每个”钩子之前“当被非所有者帐户调用时应该失败”

0 通过（3 秒） 1 失败

1. “在每个之前”挂钩“当被非所有者帐户调用时应该失败”：TypeError：分配给常量变量。 在上下文中。 （测试/ComNFT.js:11:12）”

有人可以建议我成功编写调用 safeMint 的测试的方法吗？

另一个测试“当被非所有者帐户调用时它应该失败”也没有运行？

谢谢

Answer 1

safeMint function 只有所有者修改，你应该调用 safeMint function，所有者地址是 accounts[0]（不是 accounts[1]）