What tool or methodology did you use for automating web application testing?

For automating web application testing, tools like Selenium WebDriver are often used, which allow controlling the browser programmatically and simulating user actions. Modern frameworks like Cypress and Playwright are also popular, offering convenient APIs and built-in UI testing capabilities.

Example of using Selenium in Java:

WebDriver driver = new ChromeDriver();
driver.get("https://example.com");
WebElement loginButton = driver.findElement(By.id("login"));
loginButton.click();
// Check the result
String title = driver.getTitle();
assert title.contains("Dashboard");
driver.quit();

The choice of tool depends on project requirements, programming language, and the specifics of the application under test.