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const assert = require('assert')
const PendingBalanceCalculator = require('../../app/scripts/lib/pending-balance-calculator')
const MockTxGen = require('../lib/mock-tx-gen')
const BN = require('ethereumjs-util').BN
let providerResultStub = {}
const zeroBn = new BN(0)
const etherBn = new BN(String(1e18))
const ether = '0x' + etherBn.toString(16)
describe('PendingBalanceCalculator', function () {
let balanceCalculator
describe('#valueFor(tx)', function () {
it('returns a BN for a given tx value', function () {
const txGen = new MockTxGen()
pendingTxs = txGen.generate({
status: 'submitted',
txParams: {
value: ether,
gasPrice: '0x0',
gas: '0x0',
}
}, { count: 1 })
const balanceCalculator = generateBalanceCalcWith([], zeroBn)
const result = balanceCalculator.valueFor(pendingTxs[0])
assert.equal(result.toString(), etherBn.toString(), 'computes one ether')
})
it('calculates gas costs as well', function () {
const txGen = new MockTxGen()
pendingTxs = txGen.generate({
status: 'submitted',
txParams: {
value: '0x0',
gasPrice: '0x2',
gas: '0x3',
}
}, { count: 1 })
const balanceCalculator = generateBalanceCalcWith([], zeroBn)
const result = balanceCalculator.valueFor(pendingTxs[0])
assert.equal(result.toString(), '6', 'computes one ether')
})
})
describe('if you have no pending txs and one ether', function () {
beforeEach(function () {
balanceCalculator = generateBalanceCalcWith([], etherBn)
})
it('returns the network balance', async function () {
const result = await balanceCalculator.getBalance()
assert.equal(result, ether, `gave ${result} needed ${ether}`)
})
})
describe('if you have a one ether pending tx and one ether', function () {
beforeEach(function () {
const txGen = new MockTxGen()
pendingTxs = txGen.generate({
status: 'submitted',
txParams: {
value: ether,
gasPrice: '0x0',
gas: '0x0',
}
}, { count: 1 })
balanceCalculator = generateBalanceCalcWith(pendingTxs, etherBn)
})
it('returns the subtracted result', async function () {
const result = await balanceCalculator.getBalance()
assert.equal(result, '0x0', `gave ${result} needed '0x0'`)
return true
})
})
})
function generateBalanceCalcWith (transactions, providerStub = zeroBn) {
const getPendingTransactions = () => Promise.resolve(transactions)
const getBalance = () => Promise.resolve(providerStub)
providerResultStub.result = providerStub
const provider = {
sendAsync: (_, cb) => { cb(undefined, providerResultStub) },
_blockTracker: {
getCurrentBlock: () => '0x11b568',
},
}
return new PendingBalanceCalculator({
getBalance,
getPendingTransactions,
})
}
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