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const assert = require('assert')
const ethUtil = require('ethereumjs-util')
const BN = ethUtil.BN
const TxUtils = require('../../app/scripts/lib/tx-utils')
describe('txUtils', function() {
let txUtils
before(function() {
txUtils = new TxUtils()
})
describe('addGasBuffer', function() {
it('multiplies by 1.5, when within block gas limit', function() {
// naive estimatedGas: 0x16e360 (1.5 mil)
const inputHex = '0x16e360'
// dummy gas limit: 0x3d4c52 (4 mil)
const blockGasLimitHex = '0x3d4c52'
const output = txUtils.addGasBuffer(inputHex, blockGasLimitHex)
const inputBn = hexToBn(inputHex)
const outputBn = hexToBn(output)
const expectedBn = inputBn.muln(1.5)
assert(outputBn.eq(expectedBn), 'returns 1.5 the input value')
})
it('uses original estimatedGas, when above block gas limit', function() {
// naive estimatedGas: 0x16e360 (1.5 mil)
const inputHex = '0x16e360'
// dummy gas limit: 0x0f4240 (1 mil)
const blockGasLimitHex = '0x0f4240'
const output = txUtils.addGasBuffer(inputHex, blockGasLimitHex)
const inputBn = hexToBn(inputHex)
const outputBn = hexToBn(output)
const expectedBn = hexToBn(inputHex)
assert(outputBn.eq(expectedBn), 'returns the original estimatedGas value')
})
it('buffers up to reccomend gas limit reccomended ceiling', function() {
// naive estimatedGas: 0x16e360 (1.5 mil)
const inputHex = '0x16e360'
// dummy gas limit: 0x1e8480 (2 mil)
const blockGasLimitHex = '0x1e8480'
const blockGasLimitBn = hexToBn(blockGasLimitHex)
const ceilGasLimitBn = blockGasLimitBn.muln(0.9)
const output = txUtils.addGasBuffer(inputHex, blockGasLimitHex)
// const inputBn = hexToBn(inputHex)
// const outputBn = hexToBn(output)
const expectedHex = bnToHex(ceilGasLimitBn)
assert.equal(output, expectedHex, 'returns the gas limit reccomended ceiling value')
})
})
})
// util
function hexToBn(inputHex) {
return new BN(ethUtil.stripHexPrefix(inputHex), 16)
}
function bnToHex(inputBn) {
return ethUtil.addHexPrefix(inputBn.toString(16))
}
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