Cookie management in Selenium Java - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this Selenium Java code snippet?

Consider the following Selenium Java code that adds a cookie and then retrieves it. What will be printed?

Selenium Java

import org.openqa.selenium.Cookie;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;

public class CookieTest {
    public static void main(String[] args) {
        WebDriver driver = new ChromeDriver();
        driver.get("https://example.com");
        Cookie cookie = new Cookie("session_id", "abc123");
        driver.manage().addCookie(cookie);
        Cookie retrieved = driver.manage().getCookieNamed("session_id");
        System.out.println(retrieved.getValue());
        driver.quit();
    }
}

A session_id

B null

C NoSuchElementException

D abc123

💡 Hint

Think about what value is stored in the cookie and what getValue() returns.

The code adds a cookie named 'session_id' with value 'abc123'. Retrieving it by name and calling getValue() returns 'abc123'.

❓ assertion

intermediate

Which assertion correctly verifies that a cookie named 'user' exists?

You want to assert that a cookie named 'user' is present in the browser using Selenium Java and JUnit. Which assertion is correct?

A assertEquals("user", driver.manage().getCookieNamed("user"));

B assertTrue(driver.manage().getCookieNamed("user").isPresent());

C assertNotNull(driver.manage().getCookieNamed("user"));

D assertFalse(driver.manage().getCookies().contains("user"));

💡 Hint

Check what getCookieNamed returns if the cookie does not exist.

getCookieNamed returns null if the cookie is not found. So asserting not null confirms the cookie exists.

🔧 Debug

advanced

Why does this code throw a NullPointerException?

Examine the code below. It throws a NullPointerException at runtime. What is the cause?

Selenium Java

Cookie cookie = driver.manage().getCookieNamed("auth_token");
System.out.println(cookie.getValue());

A The cookie named 'auth_token' does not exist, so getCookieNamed returns null, causing getValue() to throw NullPointerException.

B getValue() method is deprecated and throws NullPointerException.

C The driver.manage() method is not initialized properly.

D Cookies cannot be retrieved before page load.

💡 Hint

What happens if getCookieNamed does not find the cookie?

If the cookie is not found, getCookieNamed returns null. Calling getValue() on null causes NullPointerException.

🧠 Conceptual

advanced

What is the main reason to delete cookies during automated testing?

Why do testers often delete cookies before or after running automated Selenium tests?

A To speed up the browser loading time by removing cookies.

B To ensure tests run in a clean state without leftover session data affecting results.

C To permanently block websites from tracking the user.

D To increase the browser's cache size for faster performance.

💡 Hint

Think about test isolation and repeatability.

Deleting cookies ensures no leftover session or user data affects test outcomes, making tests reliable and repeatable.

❓ framework

expert

Which Selenium Java code snippet correctly deletes all cookies and verifies none remain?

Select the code snippet that deletes all cookies from the browser and then asserts that no cookies remain.

A

driver.manage().deleteAllCookies();
assertTrue(driver.manage().getCookies().isEmpty());

B

driver.manage().deleteAllCookies();
assertNotNull(driver.manage().getCookies());

C

driver.manage().deleteAllCookies();
assertFalse(driver.manage().getCookies().isEmpty());

D

driver.manage().deleteAllCookies();
assertEquals(null, driver.manage().getCookies());

💡 Hint

Check what getCookies() returns after deleting all cookies.

After deleting all cookies, getCookies() returns an empty set, so isEmpty() returns true. This confirms deletion.