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The Ultimate Unit Testing Cheat-sheet

Sinon Chai
Chai
Sinon

Talks about Programming, Design, and Human Understanding

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Get started • • BigchainDB

https://www.bigchaindb.com/getstarted/
Kadena: Scalable Blockchain | Smarter Contracts

http://kadena.io/
kadena-io/pact: The Pact Smart Contract Language

Suppose we wish to model a UTXO system on the EVM. We need to represent UTXO tokens such that all value is preserved when tokens are spent. Note: For this example, we are not concerned about the security of the system and are satisfied with giving authorities the power to create tokens (e.g. as in a plasma system).

Consider the following object:

{
  owner: <address>,
  value: <uint>,

	// where map(x, function(y, i, z){ z === x; return y }) === x
	// and i is the index/key, and z is the first argument to map
	// e.g. utilsFromMap(function(array, fn){ array.map(fn) });
	// e.g. utilsFromMap(React.Children.map);
	function utilsFromMap(map){
	var utils = {};

	// herein fn is a function,
	// X is the thing to be passed to map as the first argument
	// and there other parameters are specific to the function

	web3.eth.filter("pending").watch(function() {
	if (eth.mining) return;
	console.log(new Date() + "-- Transactions detected, so starting mining.");
	miner.start(1);
	});

	web3.eth.filter('latest', function(error, result) {
	console.log(new Date() + "-- Got latest, so stopping mining");
	miner.stop();
	if (txpool.status.pending > 0) {

	if (!String.prototype.repeat) {
	// polyfill from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat
	String.prototype.repeat = function(count) {
	'use strict';
	if (this == null) {
	throw new TypeError('can\'t convert ' + this + ' to object');
	}
	var str = '' + this;
	count = +count;
	if (count != count) {

	const Rx = require('rx');

	module.exports = {
	rxify: function (web3) {
	// List synchronous functions masquerading as values.
	var syncGetters = {
	db: [],
	eth: [ "accounts", "blockNumber", "coinbase", "gasPrice", "hashrate",
	"mining", "protocolVersion", "syncing" ],
	net: [ "listening", "peerCount" ],

	module.exports = {
	promisify: function (web3) {
	// Pipes values from a Web3 callback.
	var callbackToResolve = function (resolve, reject) {
	return function (error, value) {
	if (error) {
	reject(error);
	} else {
	resolve(value);
	}