In Part 1 to 4, we went through solidity to develop smart contract in Remix, setup development environment, created unit testing methods for smart contract, created a front-end application with Node.js to interact with smart contracts. Now, we will deploy smart contract using truffle and infura. Also, will deploy Node.js application to Heroku.
In Part-2, we deployed our smart contract on local private Ethereum blockchain. Now, we will test out our Solidity smart contracts behaviour with unit testing with Truffle which uses Chai and Mocha frameworks. In web development lifecycle, unit testing is needed to do to ensure the code is working the way as it is expected. So let’s start it by creating a test file by running following command:
In Part-1, we made Hello World contract in Remix. As we have to write code in the files and manage in repository for development perspective so in this blog post, we will setup our development environment, a private Ethereum blockchain on local machine and deploy our smart contract on the blockchain. I am using Ubuntu 18 for writing this post. But can be setup on Windows and MAC machines.
In this tutorial series, we are going to build a simple Hello World Dapp (decentralized application) on Ethereum with Solidity, Truffle & Web3 tech stack. After this, we will deploy it to test network (Infura and Heroku). This dapp will simply store and retrieve user input text on Ethereum.
In part one, we’ll write a smart contract in Solidity using Remix. Let’s build a simple ‘Hello World’ application (The best way to learn new technologies). It is assumed you know the basics of Blockchain and its terminology. Here is quick intro of some terms: