我在 Truffle 框架中有一个 Solidity 合约,但我不明白为什么我的 JS 测试不起作用。
我正在尝试测试“setPlayers”函数,合约有效并且测试正在运行,但我不明白如何在测试中调用该函数:
pragma solidity ^0.4.23;
contract Swindle {
string public eventName;
uint public entryFee;
string[] public players;
string public winner;
uint public winnings;
function comp(string _eventName, uint _entryFee) public {
eventName = _eventName;
entryFee = _entryFee;
}
function addPlayers(string _player) public {
players.push(_player);
}
function winner(string _player) public returns (string, uint) {
winner = _player;
winnings = (players.length * entryFee);
return (winner, winnings);
}
}
测试文件:
var Swindle = artifacts.require("Swindle");
contract('Swindle', function(accounts) {
it('sets player to stuart', function(){
return Swindle.deployed().then(function(instance) {
swindle = instance;
return swindle.addPlayers.call("stuart");
}).then(function(swindle) {
assert.equal(swindle.players[0], "stuart", "sets the total supply");
})
})
})
错误:
0 passing (302ms)
1 failing
1) Contract: Swindle
sets player to stuart:
TypeError: Cannot read property '0' of undefined
at test/test-swindle.js:10:32
at <anonymous>
at process._tickCallback (internal/process/next_tick.js:118:7)
最佳答案
正如您在测试中提到的那样,合约中没有 setPlayers
方法。
您无法在 JavaScript 中直接访问合约数组。首先,您需要调用 players
作为方法。
it('sets player to stuart', function(){
return Swindle.deployed().then(function(instance) {
swindle = instance;
return swindle.addPlayers.call("stuart");
}).then(function(swindle) {
return swindle.players();
}).then(function(players) {
assert.equal(players[0], "stuart", "sets the total supply");
})
})
<小时/>
您可以async/await
以获得更好的测试可读性。
it('sets player to stuart', async () => {
let swindle = await Swindle.deployed();
await swindle.addPlayers.call("stuart");
let players = await swindle.players.call();
assert.equal(players[0], "stuart", "sets the total supply");
});
关于javascript - Truffle JS 测试不起作用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/50630871/