Web3 automation in Selenium step by step

Web3 automation in Selenium refers to automating the interaction between Selenium and the Ethereum blockchain using the Web3.js library. This involves writing Selenium scripts to perform actions on the Ethereum blockchain, such as sending transactions, reading data from smart contracts, and interacting with decentralized applications (dApps).

Here’s an example of how you can interact with a smart contract using Selenium and Web3.js:

1. Set up a test environment: Create a Selenium test project and install the necessary dependencies, including Web3.js, a Selenium driver, and a blockchain client.
2. Connect to the Ethereum blockchain: Use the Web3.js library to connect to the Ethereum blockchain and retrieve the necessary information, such as the address of the smart contract and the ABI (Application Binary Interface).
3. Send transactions: Use Selenium to automate the process of sending transactions to the smart contract, such as executing a function or changing the state of the contract.
4. Read data from the smart contract: Use Selenium and Web3.js to automate the process of reading data from the smart contract, such as retrieving the current state of the contract or the value of a particular variable.
5. Interact with dApps: Use Selenium and Web3.js to automate the interaction with decentralized applications (dApps) built on the Ethereum blockchain, such as performing actions on the dApp or verifying the state of the dApp.

By combining Selenium and Web3.js, you can automate the interaction between your tests and the Ethereum blockchain, making it easier to test and validate the functionality of smart contracts and dApps.

Here’s an example of Web3 automation in Selenium using the Java language

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.web3j.protocol.Web3j;
import org.web3j.protocol.http.HttpService;

public class Web3Automation {
    public static void main(String[] args) throws Exception {
        // Initialize Selenium WebDriver
        System.setProperty("webdriver.chrome.driver", "/path/to/chromedriver");
        WebDriver driver = new ChromeDriver();
        driver.get("https://example.com");

        // Connect to the Ethereum blockchain using Web3j
        Web3j web3j = Web3j.build(new HttpService("https://mainnet.infura.io/v3/YOUR-PROJECT-ID"));

        // Send a transaction to the Ethereum blockchain
        String contractAddress = "0x1234567890abcdef";
        String functionSignature = "functionName(type1,type2)";
        String encodedFunction = FunctionEncoder.encode(functionSignature);
        Transaction transaction = Transaction.createFunctionCallTransaction(
                "0xFROM_ADDRESS",
                BigInteger.valueOf(getNextNonce()),
                BigInteger.valueOf(1_000_000_000),
                BigInteger.valueOf(21_000),
                contractAddress,
                encodedFunction
        );
        EthSendTransaction ethSendTransaction = web3j.ethSendTransaction(transaction).sendAsync().get();
        String transactionHash = ethSendTransaction.getTransactionHash();

        // Verify the transaction status using Selenium
        driver.get("https://etherscan.io/tx/" + transactionHash);
        String status = driver.findElement(By.cssSelector("#ContentPlaceHolder1_maintable > tbody > tr:nth-child(3) > td:nth-child(2)")).getText();
        assertEquals("Success", status);

        // Close the Selenium WebDriver
        driver.close();
    }
}

In this example, we first initialize the Selenium WebDriver and connect to a website. Then, we use the Web3j library to connect to the Ethereum blockchain and send a transaction to the blockchain. Finally, we use Selenium to verify the transaction status by navigating to a blockchain explorer and retrieving the transaction status using CSS selectors.

This is just one example of how you can automate the interaction between Selenium and the Ethereum blockchain using Web3.js. Depending on your specific requirements, you may need to modify the code to suit your needs.

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Author : Ghulam Nabi