ethereumjs-blockchain - test getHead() for a reopened block-containing leveldown DB instance

ethereumjs-blockchain_test_getHead.js

'use strict'

const test = require('tape')
const Blockchain = require('..')
const Block = require('ethereumjs-block')
const async = require('async')
const ethUtil = require('ethereumjs-util')
const levelup = require('levelup')
const leveldown = require('leveldown')
const memdown = require('memdown')
const testData = require('./testdata.json')
const BN = require('bn.js')

test('blockchain test', function (t) {
  var db = levelup('./db', { db: leveldown })
  var blockchain = new Blockchain({ db: db })
  var genesisBlock
  var blocks = []
  var forkBlock
  blockchain.validate = false
  async.series([

    function (done) {
      blockchain.getHead(function (err, head) {
        if (err) return done(err)
        console.log(head)
        t.ok(true, 'should not crash on getting head of a blockchain without a genesis')
        done()
      })
    },
    function addgenesis (done) {
      genesisBlock = new Block()
      genesisBlock.setGenesisParams()
      blockchain.putGenesis(genesisBlock, function (err) {
        if (err) return done(err)
        t.equals(genesisBlock.hash().toString('hex'), blockchain.meta.genesis.toString('hex'), 'genesis block hash should be correct')
        blocks.push(genesisBlock)
        done()
      })
    },
    function addBlocks (done) {
      function addNextBlock (blockNumber) {
        var block = new Block()
        block.header.number = ethUtil.toBuffer(blockNumber)
        block.header.difficulty = '0xfffffff'
        block.header.parentHash = blocks[blockNumber - 1].hash()
        blockchain.putBlock(block, function (err) {
          if (err) return done(err)

          blocks.push(block)

          if (blocks.length === 10) {
            t.ok(true, 'added 10 blocks')
            done()
          } else {
            addNextBlock(blockNumber + 1)
          }
        })
      }
      addNextBlock(1)
    }
  ], function (err) {
    if (err) {
      t.ok(false, err)
    } else {
      t.ok(true, 'no errors')
    }
  })
})