Sample Test Automation Framework to automate Blockchain App

Mayank Gupta
2 min readSep 10, 2023

Building a test automation framework for blockchain involves some unique considerations due to the distributed and decentralized nature of blockchain applications. Below is a high-level outline of a sample test automation framework using JavaScript and tools like Selenium and Mocha for Ethereum-based blockchain smart contracts. This framework focuses on automating interactions with a blockchain-based Dapp (decentralized application) through a web UI.

Prerequisites:

  • Node.js and npm installed on your system.
  • Familiarity with JavaScript and Ethereum development.
  • An Ethereum testnet account with test Ether for transactions.

Framework Components:

  1. Test Runner: Use Mocha as the test runner to organize and execute test cases.
  2. Automation Tool: Selenium WebDriver to automate interactions with the Dapp's web UI.
  3. Blockchain Interaction Library: A JavaScript library (e.g., Web3.js or ethers.js) to interact with Ethereum smart contracts from your tests.
  4. Test Cases: Write test cases that describe the interactions with the Dapp, including invoking smart contract functions and verifying results.

Sample Test Automation Framework Structure:

project-root/
├── package.json
├── test/
│ ├── setup.js
│ ├── testCases/
│ │ ├── testScenario1.js
│ │ ├── testScenario2.js
│ ├── config/
│ │ ├── testConfig.json
├── webdrivers/
├── node_modules/
└── ...

Sample Test Case (Mocha + Selenium):

// test/testCases/testScenario1.js

const { Builder, By, Key, until } = require('selenium-webdriver');
const { expect } = require('chai');
const Web3 = require('web3');

describe('Blockchain Dapp Automation', function () {
let driver;
let web3;

before(async function () {
// Initialize the Selenium WebDriver
driver = new Builder().forBrowser('chrome').build();

// Initialize Web3 with an Ethereum testnet provider
web3 = new Web3('https://rinkeby.infura.io/v3/YOUR_INFURA_PROJECT_ID');
});

it('Should interact with the Dapp', async function () {
// Navigate to the Dapp URL
await driver.get('https://your-dapp-url.com');

// Perform UI interactions (e.g., clicks, form submissions)
const button = await driver.findElement(By.id('your-button-id'));
await button.click();

// Perform blockchain interactions (e.g., invoking smart contract functions)
const contractAddress = '0xYourSmartContractAddress';
const abi = [...]; // ABI of your smart contract
const contract = new web3.eth.Contract(abi, contractAddress);

// Example: Call a view function of the smart contract
const result = await contract.methods.someViewFunction().call();

// Verify results using Chai assertions
expect(result).to.equal('ExpectedValue');

// Perform additional UI or blockchain interactions as needed
});

after(async function () {
// Clean up after the test
await driver.quit();
});
});

Running Tests:

  1. Install dependencies by running npm install in the project root directory.
  2. Run the tests using Mocha: npx mocha test/testCases.

This sample framework is a starting point and can be extended based on your specific blockchain and Dapp requirements. Remember to handle wallet interactions securely, manage test Ether on the testnet, and consider error handling and logging for robust automation. Additionally, ensure that your test environment is set up correctly with test accounts, a reliable Ethereum testnet node, and the required smart contract ABIs.

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Mayank Gupta

QA Automation Lead | Web Automation | Mobile Automation | API Automation l Performance | Web Security | IOT | Blockchain