2_SmartContracts.md

Initialize truffle

md smartcontracts
cd smartcontracts

truffle init

del truffle.js

truffle compile

Create new contract

truffle create contract Calculator

(add constructor and function code)

truffle compile

Setup the dev network

ganache-cli

(update truffle-config.js)

module.exports = {
    networks: {
        development: {
            host: "localhost",
            port: 8545,
            network_id: "*"
        }
    }
};

Deploy the contract to dev network

truffle create migration calculator

(update the migrations\###########_calculator.js file)

var Calculator = artifacts.require("./Calculator.sol");

module.exports = function(deployer) {
    deployer.deploy(Calculator,10);
};

truffle migrate

Test the contract

truffle create test calculator

(updated test\calculator.js)

var Calculator = artifacts.require("./Calculator.sol");

contract('calculator', function(accounts) {
    it("should initialized correctly", function(done) {
        var calculator = Calculator.deployed()
        calculator.then(function(contract){
        return contract.getResult.call();
        }).then(function (result) {
            assert.equal(result.valueOf(), 10, "Contract initialized with value equal to 10!!!");
            console.log("Result =>" + result.valueOf());
            done();
        });
    });
});

truffle test ./test/calculator.js