Selenium Debugging & Performance Optimization 2

Question 1

Which Selenium WebDriver method allows you to capture a screenshot of the current browser state for debugging purposes?

Accepted Answer

((TakesScreenshot) driver).getScreenshotAs(OutputType.FILE)

Answer

The TakesScreenshot interface provides getScreenshotAs() to capture the current browser state as a file, byte array, or base64 string.

Question 2

What does a 'StaleElementReferenceException' indicate in Selenium?

Accepted Answer

The element reference is no longer valid because the DOM was updated

Answer

StaleElementReferenceException occurs when the DOM has changed after an element was located, invalidating the stored reference.

Question 3

Which tool can be integrated with Selenium to monitor JavaScript errors on the page during test execution?

Accepted Answer

BrowserMob Proxy

Answer

BrowserMob Proxy can capture HTTP traffic and JavaScript errors, enabling deeper debugging alongside Selenium tests.

Question 4

When debugging a flaky test, which Selenium strategy helps identify whether element visibility is causing intermittent failures?

Accepted Answer

Using ExpectedConditions.visibilityOfElementLocated() with explicit waits

Answer

ExpectedConditions.visibilityOfElementLocated() with explicit waits precisely waits for element visibility, eliminating timing-related flakiness.

Question 5

How can you retrieve browser console logs in Selenium WebDriver for debugging JavaScript errors?

Accepted Answer

driver.manage().logs().get(LogType.BROWSER)

Answer

driver.manage().logs().get(LogType.BROWSER) retrieves browser console log entries captured during the test session.

(Selenium) Selenium Testing Certification Practice Test