标签：function return candidate 以太 electionInstance equal assert DApp Truffle

以太坊Truffle投票DApp实现

创建项目

1. 进入projects目录
   cd /opt/module/projects
2. 克隆项目
   git clone https://github.com/guoguanhui/VoteDapp.git

开启ganache-cli

1. 输入命令：ganache-cli
2. 记住12个单词的助记符，后续需要使用（每次新开启一个ganache客户端都会重新初始化助记符）。output parent when east clown cake duck garbage jump spin medal cute

修改配置文件

1. vim truffle-config.js

module.exports = {
  // See <http://truffleframework.com/docs/advanced/configuration>
  // for more about customizing your Truffle configuration!
  networks: {
    development: {
      host: "127.0.0.1",
      port: 8545, // ganache监视的端口
      network_id: "*" // Match any network id
    }
  }
};

编译部署智能合约

1. truffle console
2. truffle compile
3. truffle migrate

测试智能合约

1. 修改test/election.js测试文件

var Election = artifacts.require("./Election.sol");

contract("Election", function(accounts) {
  var electionInstance;

  it("initializes with two candidates", function() {
    return Election.deployed().then(function(instance) {
      return instance.candidatesCount();
    }).then(function(count) {
      assert.equal(count, 2);
    });
  });

  it("it initializes the candidates with the correct values", function() {
    return Election.deployed().then(function(instance) {
      electionInstance = instance;
      return electionInstance.candidates(1);
    }).then(function(candidate) {
      assert.equal(candidate[0], 1, "contains the correct id");
      assert.equal(candidate[1], "福星", "contains the correct name");
      assert.equal(candidate[2], 0, "contains the correct votes count");
      return electionInstance.candidates(2);
    }).then(function(candidate) {
      assert.equal(candidate[0], 2, "contains the correct id");
      assert.equal(candidate[1], "高照", "contains the correct name");
      assert.equal(candidate[2], 0, "contains the correct votes count");
    });
  });

  it("allows a voter to cast a vote", function() {
    return Election.deployed().then(function(instance) {
      electionInstance = instance;
      candidateId = 1;
      return electionInstance.vote(candidateId, { from: accounts[0] });
    }).then(function(receipt) {
      assert.equal(receipt.logs.length, 1, "an event was triggered");
      assert.equal(receipt.logs[0].event, "votedEvent", "the event type is correct");
      assert.equal(receipt.logs[0].args._candidateId.toNumber(), candidateId, "the candidate id is correct");
      return electionInstance.voters(accounts[0]);
    }).then(function(voted) {
      assert(voted, "the voter was marked as voted");
      return electionInstance.candidates(candidateId);
    }).then(function(candidate) {
      var voteCount = candidate[2];
      assert.equal(voteCount, 1, "increments the candidate's vote count");
    })
  });

  it("throws an exception for invalid candiates", function() {
    return Election.deployed().then(function(instance) {
      electionInstance = instance;
      return electionInstance.vote(99, { from: accounts[1] })
    }).then(assert.fail).catch(function(error) {
      assert(error.message.indexOf('revert') >= 0, "error message must contain revert");
      return electionInstance.candidates(1);
    }).then(function(candidate1) {
      var voteCount = candidate1[2];
      assert.equal(voteCount, 1, "candidate 1 did not receive any votes");
      return electionInstance.candidates(2);
    }).then(function(candidate2) {
      var voteCount = candidate2[2];
      assert.equal(voteCount, 0, "candidate 2 did not receive any votes");
    });
  });

  it("throws an exception for double voting", function() {
    return Election.deployed().then(function(instance) {
      electionInstance = instance;
      candidateId = 2;
      electionInstance.vote(candidateId, { from: accounts[1] });
      return electionInstance.candidates(candidateId);
    }).then(function(candidate) {
      var voteCount = candidate[2];
      assert.equal(voteCount, 1, "accepts first vote");
      // Try to vote again
      return electionInstance.vote(candidateId, { from: accounts[1] });
    }).then(assert.fail).catch(function(error) {
      assert(error.message, "error message must contain revert");
      return electionInstance.candidates(1);
    }).then(function(candidate1) {
      var voteCount = candidate1[2];
      assert.equal(voteCount, 1, "candidate 1 did not receive any votes");
      return electionInstance.candidates(2);
    }).then(function(candidate2) {
      var voteCount = candidate2[2];
      assert.equal(voteCount, 1, "candidate 2 did not receive any votes");
    });
  });
});

2. truffle test

启动服务

1. 开启lite-server
   npm run dev
2. 浏览器访问：http://localhost:3000/
3. 一个账户只能投一票
   

标签：function,return,candidate,以太,electionInstance,equal,assert,DApp,Truffle
来源： https://www.cnblogs.com/GarrettWale/p/15448788.html

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