Question

我想用构造函数中的参数测试智能合约，但有错误。这是我的智能合约和测试文件：

pragma solidity >=0.4.25 <0.7.0;

contract Test {
    string public test;
    constructor(string memory _test) public {
        test = _test;
    }
}

const Test = artifacts.require("Test");

contract('Test', (accounts) => {
  it('should init', async () => {
  
    const instance = await Test.new("test");
    const result = await instance.test;
    assert.equal("test", result, "info is not equals");
  });
});

并记录：

Error: while migrating Test: Invalid number of parameters for "undefined". Got 0 expected 1!
    at /usr/local/lib/node_modules/truffle/build/webpack:/packages/deployer/src/deployment.js:365:1
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
    at Migration._deploy (/usr/local/lib/node_modules/truffle/build/webpack:/packages/migrate/Migration.js:68:1)
    at Migration._load (/usr/local/lib/node_modules/truffle/build/webpack:/packages/migrate/Migration.js:55:1)
    at Migration.run (/usr/local/lib/node_modules/truffle/build/webpack:/packages/migrate/Migration.js:171:1)
    at Object.runMigrations (/usr/local/lib/node_modules/truffle/build/webpack:/packages/migrate/index.js:150:1)
    at Object.runFrom (/usr/local/lib/node_modules/truffle/build/webpack:/packages/migrate/index.js:110:1)
    at Object.runAll (/usr/local/lib/node_modules/truffle/build/webpack:/packages/migrate/index.js:114:1)
    at Object.run (/usr/local/lib/node_modules/truffle/build/webpack:/packages/migrate/index.js:79:1)
    at Object.run (/usr/local/lib/node_modules/truffle/build/webpack:/packages/core/lib/testing/Test.js:109:1)
    at Object.run (/usr/local/lib/node_modules/truffle/build/webpack:/packages/core/lib/commands/test/index.js:192:1)
    at Command.run (/usr/local/lib/node_modules/truffle/build/webpack:/packages/core/lib/command.js:136:1)
Truffle v5.1.64 (core: 5.1.64)
Node v12.16.3

如何解决？

Answer 1

您忘记传递交易参数，包括发件人（部署者）地址。

const instance = await Test.new("test");

应该

const accounts = await web3.eth.getAccounts();
const txParams = {
    from: accounts[0]
};
const instance = await Test.new("test", txParams);

Web3 帐户获取器：https://web3js.readthedocs.io/en/v1.3.4/web3-eth.html#getaccounts

有关 new() 函数的更多信息：https://www.trufflesuite.com/docs/truffle/reference/contract-abstractions#-code-mycontract-new-arg1-arg2-tx-params-code-

使用松露构造函数中的参数测试智能合约

1 个答案: