This post is to show how similar every technology to each other. If you experienced with NUnit, XUnit, Jasmine, Protractor, etc., you can easily figure out how to write unit-tests for blockchain smart-contracts using the Truffle tool which under the hood is NodeJS.
What do we have? A simple smart contract written on Solidity which creates an entity, for us it’s the Task.
pragma solidity >=0.4.22 <0.8.0;
contract TodoList {
uint256 public taskCount = 0;
struct Task {
uint256 id;
string content;
bool completed;
}
mapping(uint256 => Task) public tasks;
constructor() public {
createTask("Check my portfolio ivanbrygar.net");
}
function createTask(string memory _content) public {
taskCount++;
tasks[taskCount] = Task(taskCount, _content, false);
}
}
To test the smart contract we should create a JavaScript file under the test folder, for example test/TodoList.test.js:
const TodoList = artifacts.require("./TodoList.sol");
contract("TodoList", (accounts) => {
before(async () => {
this.todoList = await TodoList.deployed();
});
it("deployed successfully", async () => {
const address = await this.todoList.address;
assert.notEqual(address, 0x0);
assert.notEqual(address, "");
assert.notEqual(address, null);
assert.notEqual(address, undefined);
});
it("lists tasks", async () => {
const taskCount = await this.todoList.taskCount();
const task = await this.todoList.tasks(taskCount);
assert.equal(task.id.toNumber(), taskCount.toNumber());
assert.equal(task.content, "Check my portfolio ivanbrygar.net");
assert.equal(task.completed, false);
assert.equal(taskCount.toNumber(), 1);
});
});
As you can see, the structure has the familiar structure with tear down.
For run the tests, navigate to the root directory of the project in terminal/cmd and execute: truffle test command:
For the full project reference please refer to the GitHub repository: https://github.com/smitbmx/TodoList-Blockchain-Ethereum
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