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04-ExtraCredit-Mining.js
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04-ExtraCredit-Mining.js
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'use strict';
const { expect } = require('chai');
const { randomBytes } = require('crypto');
const signing = require('../signing');
const {
MineableTransaction,
MineableBlock,
MineableChain,
isValidMineableChain
} = require('../mining');
describe.skip('Mining module', function() {
describe('MineableTransaction', function() {
let signer = null;
let recipient = null;
let amount = null;
beforeEach(function() {
signer = signing.createPrivateKey();
recipient = signing.getPublicKey(signing.createPrivateKey());
amount = Math.ceil(Math.random() * 100);
});
it('should include signer public key as source', function() {
const transaction = new MineableTransaction(signer, recipient, amount);
expect(transaction.source).to.equal(signing.getPublicKey(signer));
});
it('should include the passed recipient and amount', function() {
const transaction = new MineableTransaction(signer, recipient, amount);
expect(transaction.recipient).to.equal(recipient);
expect(transaction.amount).to.equal(amount);
});
it('should include a valid signature', function() {
const transaction = new MineableTransaction(signer, recipient, amount);
const { source, signature } = transaction;
const signedMessage = source + recipient + amount;
expect(signing.verify(source, signedMessage, signature)).to.be.true;
});
it('should create a reward by making signer the recipient', function() {
const transaction = new MineableTransaction(signer, recipient, amount);
const reward = new MineableTransaction(signer, null, amount);
expect(reward.source).to.equal(null);
expect(reward.recipient).to.equal(signing.getPublicKey(signer));
});
});
describe('MineableBlock', function() {
let previousHash = null;
let transactions = null;
beforeEach(function() {
const signer = signing.createPrivateKey();
const recipient = signing.getPublicKey(signing.createPrivateKey());
const amount = Math.ceil(Math.random() * 100);
transactions = [ new MineableTransaction(signer, recipient, amount) ];
previousHash = randomBytes(64).toString('hex');
});
it('should be instantiated without a hash', function() {
const block = new MineableBlock(transactions, previousHash);
expect(!!block.hash).to.be.false;
});
});
describe('MineableChain', function() {
let blockchain = null;
let transaction = null;
let miner = null;
beforeEach(function() {
blockchain = new MineableChain();
const signer = signing.createPrivateKey();
const recipient = signing.getPublicKey(signing.createPrivateKey());
const amount = Math.ceil(Math.random() * 100);
transaction = new MineableTransaction(signer, recipient, amount);
miner = signing.createPrivateKey();
blockchain.addTransaction(transaction);
blockchain.mine(miner);
});
it('should have properties for difficulty and reward', function() {
expect(blockchain.difficulty).to.exist.and.be.a('number');
expect(blockchain.reward).to.exist.and.be.a('number');
});
it('should be able to mine new blocks', function() {
expect(blockchain.blocks).to.have.lengthOf(2);
const head = blockchain.getHeadBlock();
expect(head.transactions).to.deep.include(transaction);
});
it('should mine blocks with a valid zero-leading hash', function() {
const head = blockchain.getHeadBlock();
const zeros = '0'.repeat(blockchain.difficulty);
expect(head.hash).to.be.a('string').and.not.be.empty;
expect(head.hash.slice(0, zeros.length)).to.equal(zeros);
const copy = new MineableBlock(head.transactions, head.previousHash);
copy.calculateHash(head.nonce);
expect(copy.hash).to.equal(head.hash);
});
it('should include a transaction rewarding the miner', function() {
const { transactions } = blockchain.getHeadBlock();
const reward = transactions.find(transaction => {
return transaction.recipient === signing.getPublicKey(miner);
});
expect(reward).to.not.be.undefined;
expect(reward.source).to.be.null;
expect(reward.amount).to.equal(blockchain.reward);
});
it('should not add transactions to the chain until mined', function() {
const originalHead = blockchain.getHeadBlock();
blockchain.addTransaction(new MineableTransaction(
signing.createPrivateKey(),
signing.getPublicKey(signing.createPrivateKey()),
Math.ceil(Math.random() * 100)
));
expect(originalHead).to.deep.equal(blockchain.getHeadBlock());
});
it('should clear out pending transactions after mining', function() {
// Add a transaction so we can mine a new block
blockchain.addTransaction(new MineableTransaction(
signing.createPrivateKey(),
signing.getPublicKey(signing.createPrivateKey()),
Math.ceil(Math.random() * 100)
));
blockchain.mine(miner);
const head = blockchain.getHeadBlock();
expect(head.transactions).to.not.deep.include(transaction);
});
});
describe('isValidMineableChain', function() {
let blockchain = null;
let reward = null;
let miner = null;
let recipient = null;
beforeEach(function() {
blockchain = new MineableChain();
reward = blockchain.reward;
miner = signing.createPrivateKey();
recipient = signing.getPublicKey(signing.createPrivateKey());
const empty = new MineableTransaction(miner, recipient, 0);
blockchain.addTransaction(empty);
blockchain.mine(miner);
const transfer = new MineableTransaction(miner, recipient, reward);
blockchain.addTransaction(transfer);
blockchain.mine(miner);
});
it('should return true for a valid blockchain', function() {
expect(isValidMineableChain(blockchain)).to.be.true;
});
it('should return false with an unmined block', function() {
const valid = new MineableTransaction(miner, recipient, reward);
const block = new MineableBlock([valid], blockchain.getHeadBlock().hash);
block.calculateHash(0);
blockchain.blocks.push(block);
expect(isValidMineableChain(blockchain)).to.be.false;
});
it('should return false with an extra reward transaction', function() {
const fraud = new MineableTransaction(miner, null, reward);
blockchain.addTransaction(fraud);
blockchain.mine(miner);
expect(isValidMineableChain(blockchain)).to.be.false;
});
it('should return false with a negative balance', function() {
const invalid = new MineableTransaction(miner, recipient, reward * 10);
blockchain.addTransaction(invalid);
blockchain.mine(miner);
expect(isValidMineableChain(blockchain)).to.be.false;
});
});
});