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metamask-extension/app/scripts/controllers/transactions/tx-gas-utils.test.js

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import { strict as assert } from 'assert';
import { TransactionFactory } from '@ethereumjs/tx';
import Common from '@ethereumjs/common';
import { hexToBn, bnToHex } from '../../lib/util';
import TxUtils from './tx-gas-utils';
describe('txUtils', function () {
let txUtils;
before(function () {
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txUtils = new TxUtils(
new Proxy(
{},
{
get: () => {
return () => undefined;
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},
},
),
);
});
describe('chain Id', function () {
it('prepares a transaction with the provided chainId', function () {
const txParams = {
to: '0x70ad465e0bab6504002ad58c744ed89c7da38524',
from: '0x69ad465e0bab6504002ad58c744ed89c7da38525',
value: '0x0',
gas: '0x7b0c',
gasPrice: '0x199c82cc00',
data: '0x',
nonce: '0x3',
chainId: 5,
};
const ethTx = TransactionFactory.fromTxData(txParams, {
common: new Common({ chain: 'goerli' }),
});
assert.equal(
ethTx.common.chainIdBN().toNumber(),
5,
'chainId is set from tx params',
);
});
});
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.ok(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);
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assert.ok(
outputBn.eq(expectedBn),
'returns the original estimatedGas value',
);
});
it('buffers up to recommend gas limit recommended 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);
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assert.equal(
output,
expectedHex,
'returns the gas limit recommended ceiling value',
);
});
});
});