Ethereum 如何在truffle中手动创建合同实例
假设我有两份这样的合同Ethereum 如何在truffle中手动创建合同实例,ethereum,solidity,truffle,Ethereum,Solidity,Truffle,假设我有两份这样的合同 A.sol import './B.sol'; contract A { event BCreated(address addressOfB); function createB(){ B b = new B(); BCreated(b); } } B.sol contract B { uint8 value = 5; function getValue() constant ret
A.sol
import './B.sol';
contract A {
event BCreated(address addressOfB);
function createB(){
B b = new B();
BCreated(b);
}
}
B.sol
contract B {
uint8 value = 5;
function getValue() constant returns(uint8){
return value;
}
}
var A = artifacts.require("./A.sol");
var B = artifacts.require("./B.sol");
contract('A', (accounts) => {
it("Value should be 5", async () => {
let instanceOfA = await A.deployed()
let resultTx = await instanceOfA.createB({ from: accounts[0] });
console.log("Address of B: " + resultTx.logs[0].args.addressOfB);
let instanceOfB = await B.at(resultTx.logs[0].args.addressOfB);
})
})
我试图为这些合同编写测试用例。
我可以使用迁移文件部署契约A,并将
获取它的实例
但是我不知道如何得到B合同的实例,
使用函数createB()创建合同后
好的,在调用函数createB()之后,我可以在事件中获取合同B的地址,
但我不确定这个例子
对于这个例子,你可以说我可以单独测试契约B,因为它做的不多。
但在实际情况中,我需要使用来自事件的地址创建一个实例
下面是用于truffle测试文件的js代码
在这里我有B的地址
var A = artifacts.require("./A.sol");
contract('A', (accounts) => {
it("Value should be 5", async () => {
let instanceOfA = await A.deployed()
let resultTx = await instanceOfA.createB({ from: accounts[0] });
console.log("Address of B: " + resultTx.logs[0].args.addressOfB);
/**
* How do I create the instance of B now?
*/
})
})
你可以试着这样做
A.sol
import './B.sol';
contract A {
event BCreated(address addressOfB);
function createB(){
B b = new B();
BCreated(b);
}
}
B.sol
contract B {
uint8 value = 5;
function getValue() constant returns(uint8){
return value;
}
}
var A = artifacts.require("./A.sol");
var B = artifacts.require("./B.sol");
contract('A', (accounts) => {
it("Value should be 5", async () => {
let instanceOfA = await A.deployed()
let resultTx = await instanceOfA.createB({ from: accounts[0] });
console.log("Address of B: " + resultTx.logs[0].args.addressOfB);
let instanceOfB = await B.at(resultTx.logs[0].args.addressOfB);
})
})