Data providers for parameterization in Selenium Java - Test Execution Trace

Test Overview

This test uses a data provider to run the same login test with different username and password combinations. It verifies that the login page accepts valid credentials and shows the correct welcome message.

Test Code - TestNG with Selenium WebDriver

Selenium Java

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.testng.Assert;
import org.testng.annotations.AfterClass;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;

public class LoginTest {
    WebDriver driver;

    @BeforeClass
    public void setUp() {
        driver = new ChromeDriver();
        driver.get("https://example.com/login");
    }

    @DataProvider(name = "loginData")
    public Object[][] loginData() {
        return new Object[][] {
            {"user1", "pass1"},
            {"user2", "pass2"}
        };
    }

    @Test(dataProvider = "loginData")
    public void testLogin(String username, String password) {
        driver.findElement(By.id("username")).clear();
        driver.findElement(By.id("username")).sendKeys(username);
        driver.findElement(By.id("password")).clear();
        driver.findElement(By.id("password")).sendKeys(password);
        driver.findElement(By.id("loginBtn")).click();

        String welcomeText = driver.findElement(By.id("welcomeMsg")).getText();
        Assert.assertTrue(welcomeText.contains(username), "Welcome message should contain username");

        driver.findElement(By.id("logoutBtn")).click();
    }

    @AfterClass
    public void tearDown() {
        driver.quit();
    }
}

Execution Trace - 12 Steps

Step	Action	System State	Assertion	Result
1	Test starts and Chrome browser opens	Browser opened at https://example.com/login showing login form with username, password fields and login button	-	PASS
2	Test runs first iteration with username 'user1' and password 'pass1'	Login form is visible with empty username and password fields	-	PASS
3	Find username field, clear it, enter 'user1'	Username field contains 'user1'	-	PASS
4	Find password field, clear it, enter 'pass1'	Password field contains 'pass1'	-	PASS
5	Click login button	Page navigates to user dashboard showing welcome message	Check welcome message contains 'user1'	PASS
6	Click logout button to return to login page	Login page is displayed again	-	PASS
7	Test runs second iteration with username 'user2' and password 'pass2'	Login form is visible with empty username and password fields	-	PASS
8	Find username field, clear it, enter 'user2'	Username field contains 'user2'	-	PASS
9	Find password field, clear it, enter 'pass2'	Password field contains 'pass2'	-	PASS
10	Click login button	Page navigates to user dashboard showing welcome message	Check welcome message contains 'user2'	PASS
11	Click logout button to return to login page	Login page is displayed again	-	PASS
12	Test ends and browser closes	Browser closed	-	PASS

Failure Scenario

Failing Condition: Welcome message does not contain the username after login

Execution Trace Quiz - 3 Questions

What does the data provider supply to the test method?

A Browser types to test

B Different username and password pairs

C URLs to navigate

D Timeout values for waits

Key Result

Using data providers allows running the same test with multiple sets of data, making tests efficient and reusable without repeating code.