Screenshot attachment on failure in Selenium Java - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output when this Selenium test fails?

Consider this Java Selenium test snippet that takes a screenshot on failure. What will be the result if the assertion fails?

Selenium Java

import org.openqa.selenium.*;
import org.openqa.selenium.chrome.ChromeDriver;
import org.testng.Assert;
import org.testng.annotations.*;
import java.io.File;
import org.apache.commons.io.FileUtils;

public class ScreenshotTest {
    WebDriver driver;

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

    @Test
    public void testTitle() throws Exception {
        try {
            Assert.assertEquals(driver.getTitle(), "Wrong Title");
        } catch (AssertionError e) {
            File src = ((TakesScreenshot)driver).getScreenshotAs(OutputType.FILE);
            FileUtils.copyFile(src, new File("failure.png"));
            throw e;
        }
    }

    @AfterMethod
    public void teardown() {
        driver.quit();
    }
}

A Test fails with AssertionError and a screenshot file named 'failure.png' is saved in the project folder.

B Test passes because the screenshot is taken and the error is caught, so no failure is thrown.

C Test fails but no screenshot is saved because FileUtils.copyFile throws IOException that is not handled.

D Test fails and throws a NullPointerException because driver is not initialized.

💡 Hint

Look at how the AssertionError is caught and rethrown after saving the screenshot.

The test asserts the page title against a wrong expected value, so it fails.

The catch block takes a screenshot and saves it as 'failure.png'. Then it rethrows the AssertionError, so the test fails.

No exceptions are thrown from FileUtils.copyFile because it is declared to throw Exception and the test method declares 'throws Exception'.

❓ assertion

intermediate

Which assertion correctly verifies screenshot file creation after failure?

After a Selenium test fails and saves a screenshot named 'error.png', which assertion correctly checks that the screenshot file exists?

Selenium Java

File screenshot = new File("error.png");

A Assert.assertFalse(screenshot.isFile());

B Assert.assertEquals(screenshot.length(), 0);

C Assert.assertTrue(screenshot.exists());

D Assert.assertNull(screenshot);

💡 Hint

Check if the file physically exists on disk.

To verify a file was created, we check if it exists using exists().

Option C correctly asserts the file exists.

Option C checks if file size is zero, which is not guaranteed.

Option C asserts the file is not a file, which is wrong.

Option C asserts the file object is null, which is false.

🔧 Debug

advanced

Why does this screenshot capture code throw IOException?

This Selenium Java code snippet throws IOException during screenshot capture. What is the cause?

Selenium Java

File src = ((TakesScreenshot)driver).getScreenshotAs(OutputType.FILE);
FileUtils.copyFile(src, new File("/invalid_path/failure.png"));

A FileUtils.copyFile requires a third argument for overwrite permission.

B The driver is not cast correctly to TakesScreenshot.

C The source file 'src' is null because screenshot failed.

D The destination path '/invalid_path/failure.png' does not exist or is not writable.

💡 Hint

Check the file path permissions and existence.

IOException occurs if the destination path is invalid or not writable.

Option D correctly identifies this cause.

Option D is incorrect because the cast is valid.

Option D is incorrect; getScreenshotAs returns a valid file or throws exception.

Option D is incorrect; copyFile does not require a third argument.

❓ framework

advanced

Which TestNG listener interface is best to implement automatic screenshot on test failure?

You want to automatically capture screenshots on test failures in TestNG without modifying each test method. Which listener interface should you implement?

A ISuiteListener

B ITestListener

C IAnnotationTransformer

D IInvokedMethodListener

💡 Hint

Look for listener that reacts to test method results.

ITestListener provides callbacks like onTestFailure where you can add screenshot logic.

ISuiteListener is for suite-level events, not individual tests.

IAnnotationTransformer is for modifying annotations.

IInvokedMethodListener is for method invocation events but less commonly used for failure handling.

🧠 Conceptual

expert

What is the main benefit of attaching screenshots to test reports on failure?

Why is attaching screenshots to automated test failure reports considered a best practice in software testing?

A It provides visual evidence of the failure, helping faster debugging and communication.

B It reduces the test execution time by skipping logs.

C It automatically fixes UI bugs by capturing screenshots.

D It prevents tests from failing by retrying the failed steps.

💡 Hint

Think about how screenshots help developers and testers understand failures.

Visual evidence from screenshots helps quickly identify what went wrong.

Options A, B, and D are incorrect because screenshots do not affect execution time, fix bugs, or prevent failures.