SolidityTesting

Simple Solidity Testing using Truffle and Genache

Setup

Initialize the folder.

> truffle init

Start genache

> ganache-cli -u 0

Look for address and port that system is listening on:

Listening on 127.0.0.1:8545

Here it is on port:8545

At localhost: 127.0.0.1

Modify truffle-config.js in your repo for the address and the port.

networks: {
    // Useful for testing. The `development` name is special - truffle uses it by default
    // if it's defined here and no other network is specified at the command line.
    // You should run a client (like ganache-cli, geth or parity) in a separate terminal
    // tab if you use this network and you must also set the `host`, `port` and `network_id`
    // options below to some value.
    //
    development: {
      host: "127.0.0.1",     // Localhost (default: none)
      port: 8545,            // Standard Ethereum port (default: none)
      network_id: "*",       // Any network (default: none)
     },
}

We need to setup the migration file to generate the simpleContract.sol. Create a file called ./migrations/2_initial_migrations.js. You can copy the ./migrations/1_initial_migrations.js file and modify. You need to change the const and put the path to the .sol file along with specifying it in the deployer.deploy(...) command.

Testing code.

We are trying to build the unit tests so that we can test changing the owner and ensure that the old owner cannot still make changes to the contract.

We will use the mnemonic so that we know the addresses. Not sure if this is necessary but it is one less thing to worry about during the debugging.

$ ganache-cli -m "easily trophy acoustic same lunch vibrant reflect clerk bacon donor retire frown"

# First 5 addresses.
# (0) 0x87379501c993c876A57cBE91438Ef59CcdDc3cB0 (100 ETH)
# (1) 0x4B710574671B3727FD2c5180e4626eC507d67E1D (100 ETH)
# (2) 0x3DB3017E532f7b87b7c6611BE853B340CbbcFd1D (100 ETH)
# (3) 0x6Cf48E0f71Fd1e071B66397c8ca755a61C761c54 (100 ETH)
# (4) 0xBbF6971b8cD62822C39eF834e8DCcd5F37315b97 (100 ETH)
# (5) 0x736CcD6c9061Dda3d6753eF73cE3F82566a1e7a3 (100 ETH)

Run the test from the command line.

$ truffle test ./test/Test_SuperSimple.sol

Erata

Create the migration file:

const SimpleContract = artifacts.require("./SimpleContract.sol");

module.exports = function(deployer) {
  deployer.deploy(SimpleContract);
};

Start the truffle development environment

> truffle develop

Migrate the contracts:

truffle(develop)> migrate

Load your instance so you can interact with it.

truffle(develop)> SimpleContract.deployed().then(function(instance) {app = instance;})

The contract is deployed using the first (or zeroth) account. Here we can change the value and specify using the first address. This should execute.

app.changeValueByOwner(6,{from: accounts[0]})

The contract is deployed using the first (or zeroth) account. Here we specify that the sender is the second account which is not the owner (or deployer). Because of our modifier that we put on changeValueByOwner this should now fail.

app.changeValueByOwner(6,{from: accounts[1]})

References

Using Truffle! Blockgeeks Live Coding Webinar

Deployed Addresses