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of 32What is Selenium and what are its main components?
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Selenium is an open-source automation testing framework for web applications supporting multiple programming languages and browsers.
Main components:
- Selenium WebDriver: Core component for browser automation
- Selenium Grid: Parallel and distributed testing
- Selenium IDE: Record and playback tool for Firefox/Chrome
- Selenium RC: Legacy component (deprecated)
WebDriver is most widely used as it provides direct browser communication through browser-specific drivers.
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What are the advantages and limitations of Selenium?
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Advantages:
- Open source and free
- Supports multiple browsers (Chrome, Firefox, Safari, Edge)
- Multi-language support (Java, Python, C#, JavaScript, Ruby)
- Large community support
- Integration with testing frameworks (TestNG, JUnit, PyTest)
- Cross-platform compatibility
Limitations: - Only supports web applications
- No built-in reporting
- Requires programming knowledge
- No technical support (being open source)
- Cannot test mobile apps natively
- Image-based testing is challenging
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What are the different WebDriver implementations available?
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Local WebDriver implementations:
- ChromeDriver: For Google Chrome
- GeckoDriver: For Mozilla Firefox
- EdgeDriver: For Microsoft Edge
- SafariDriver: For Safari
- InternetExplorerDriver: For Internet Explorer (deprecated)
Remote WebDriver implementations: - RemoteWebDriver: For remote execution
- EventFiringWebDriver: For event handling
- HtmlUnitDriver: Headless browser simulation
// Local driver
WebDriver driver = new ChromeDriver();
// Remote driver
WebDriver driver = new RemoteWebDriver(new URL("http://hub:4444/wd/hub"), capabilities);
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What is the difference between driver.close() and driver.quit()?
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- driver.close(): Closes the current browser window/tab only. If multiple windows are open, it closes the window that currently has focus.
- driver.quit(): Closes all browser windows and terminates the WebDriver session completely.
// Closes current window only
driver.close();
// Closes all windows and ends session
driver.quit();
Best Practice: Always use driver.quit() in finally blocks or @AfterMethod to ensure complete cleanup.
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What are the different types of locators in Selenium? Provide examples.
Explain the difference between absolute and relative XPath.
How do you handle dropdowns in Selenium?
How do you handle alerts, prompts, and confirmations?
Explain the difference between Selenium WebDriver and Selenium RC.
Explain the WebDriver architecture and how it works.
When would you choose XPath over CSS selectors and vice versa?
How do you handle dynamic elements in Selenium?
What are the different types of waits in Selenium? When would you use each?
What are ExpectedConditions? Provide examples of commonly used ones.
How do you handle frames and iframes in Selenium?
How do you handle multiple windows or tabs?
How do you scroll a page or element in Selenium?
What is Page Object Model (POM)? What are its advantages?
Explain PageFactory and @FindBy annotations.
What is the difference between @FindBy and driver.findElement()?
How do you implement cross-browser testing in Selenium?
What are some common Selenium exceptions and how do you handle them?
How do you debug Selenium tests when they fail?
How do you handle file uploads and downloads in Selenium?
What are headless browsers and when would you use them?
How do you create custom ExpectedConditions?
How do you run tests in parallel using Selenium Grid?
What are the challenges in parallel test execution and how do you handle them?
What are Selenium best practices for maintainable test automation?
How do you perform database testing with Selenium?
What are the key features introduced in Selenium 4?
How do you use Selenium 4's relative locators?
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