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Cookie Testing: What it is, Why & How to Test?

October 10, 2023Aaron Thomas
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Cookie Testing What it is, Why & How to Test
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In the ever-evolving digital landscape, cookies are pivotal in web functionality and user experience. For anyone using a web browser, understanding cookies and their functionality would help in improving the browsing experience as well.

This article will explore what cookie testing entails, why it’s crucial, and how to perform it effectively.

What are Cookies?

Before diving into cookie testing, let’s clarify what cookies are. In the context of web technology, cookies are small pieces of data that websites store on a user’s device. They serve multiple purposes, including:

  • Session Management: Cookies help maintain user sessions, ensuring that users stay logged in during their visit to a website.
  • Personalization: Websites use cookies to remember user preferences and settings, providing a customized browsing experience.
  • Tracking: Cookies are often utilized for tracking user behavior and gathering valuable data for analytics and marketing purposes.
  • Shopping Carts: E-commerce websites employ cookies to store items in a user’s shopping cart.

Now that we have a basic understanding of cookies let’s explore why testing them is crucial.

Where are Cookies Stored?

Cookies are integral to the functioning of modern web browsers, but have you ever wondered where they are stored on your device? The storage location can vary based on your browser and operating system, but some general principles exist.

Browser Cache Memory

In most cases, cookies find home in the browser’s cache memory. When you visit a website that utilizes cookies, these small pieces of data are deposited directly into your browser. Here’s a breakdown of where you might find cookies on some popular browsers:

Google Chrome: 

In the case of Google Chrome, cookies are typically stored in a location like %LocalAppData%\Google\Chrome\User Data\Default\cookies. This is a system-specific directory where Chrome keeps your browsing data, including cookies.

Microsoft Edge: 

Like Chrome, Microsoft Edge stores cookies within a specific user data directory. The exact location may vary depending on your operating system and version of Edge.

Mozilla Firefox: 

Firefox is another browser that saves cookies in its cache. The location can differ based on your operating system. For example, it can be found on Windows at C:\Users\<Username>\AppData\Roaming\Mozilla\Firefox\Profiles\<Profile>\cookies.sqlite.

Safari: 

On macOS, Safari stores cookies in a binary format within the Cookies folder associated with your user profile.

Mobile Devices

On mobile devices like smartphones and tablets, cookies are stored slightly differently. The respective mobile browser application typically manages them. The specific location can vary between Android and iOS devices.

Understanding where cookies are stored is essential for curious users,  web developers, and administrators. It allows for better management, troubleshooting, and, in some cases, clearing of cookies when needed.

Cookies, those small pieces of data stored on a user’s device, serve many purposes in modern websites, from session management to personalization and tracking.

Cookie Testing is a fundamental aspect of web development and quality assurance that focuses on verifying the proper functioning and security of cookies used in web applications. 

Cookies Testing systematically examines these cookies to ensure they meet the intended objectives and adhere to essential criteria, such as data integrity and user privacy. Let’s delve deeper into what this testing process entails.

Cookie testing is a critical aspect of web development and maintenance. It ensures that cookies, those small data websites store on your device, function correctly. Let’s delve into why cookie testing is indispensable.

1. Data Integrity

Cookies store various types of information, such as user preferences, login sessions, and shopping cart contents. It’s vital to verify that the data within cookies is accurately transmitted between the browser and the server. Cookie testing helps ensure the integrity of this data.

2. Website Functionality

Many websites rely on cookies to provide essential functionality. For instance, without cookies, users might have to log in repeatedly during a single session or lose items in their shopping cart. Cookie testing is necessary to guarantee that these critical functions work seamlessly.

3. Privacy Compliance

In an era of heightened privacy concerns and regulations (e.g., GDPR, CCPA), it’s essential to ensure that cookies handle user data transparently and comply with legal requirements. Cookie testing verifies that user consent is properly obtained and data is processed securely.

4. Security

Cookies can be vulnerable to security threats. Malicious actors may attempt to manipulate cookies to gain unauthorized access or perform other malicious activities. Cookie testing helps identify and mitigate security vulnerabilities associated with cookies.

5. Optimized Performance

Excessively used or poorly designed cookies can impact website performance, leading to slower loading times. Testing cookies ensures efficiency and does not hinder the website’s overall performance.

6. Cross-Browser and Cross-Device Compatibility

Different browsers and devices may handle cookies differently. Cookie testing across various browsers and devices is essential to ensure a consistent user experience.

7. User Experience

Faulty cookies can result in a frustrating user experience. For example, a website failing to remember a user’s preferences or history due to a cookie issue can lead to dissatisfaction. Cookie testing helps identify and rectify such issues.

8. Regression Testing

As websites evolve and new features are added, performing regression testing on cookies is crucial. This ensures that updates or changes to the website avoid inadvertently breaking cookie functionality.

How to Test Cookies in a Website: Manual and Automation

Testing cookies on a website is crucial to ensure proper functionality and security. This process can be performed manually or automated with tools like Testsigma. Below, we’ll explore both methods and the steps involved.

Test Environment Setup: Begin by setting up your testing environment, a local or staging website version. Ensure you have access to the browser’s developer tools for inspection.

Identify Cookie Scenarios: Determine the various scenarios in which cookies are used on the website. This may include user login sessions, personalized content, or behavior tracking.

Cookie Inspection: Manually inspect cookies using the browser’s developer tools. Check if cookies are being set, read, and deleted correctly. Verify that the data they contain aligns with expected values.

Data Validation: Validate the data stored in cookies. Confirm that it matches user interactions on the site. For instance, if a cookie stores a user’s shopping cart, ensure it accurately reflects the items added.

Functionality Testing: Test the functionality associated with cookies. For example, if cookies maintain user sessions, conduct login and logout tests to ensure sessions are handled correctly.

Privacy and Security Checks: Verify that the website complies with privacy regulations, including obtaining user consent for tracking cookies. Also, check for security vulnerabilities like cookie manipulation.

Cross-Browser Testing: Test cookies on different web browsers to ensure cross-browser compatibility. Different browsers may handle cookies slightly differently.

Test Case Creation: Create test cases within the Testsigma platform, specifying the scenarios you want to test. For instance, you can create a test case to validate the functionality of a login session cookie.

Scripting: Write test scripts using Testsigma’s scripting language. These scripts interact with the website, such as logging in, adding items to a cart, or verifying personalized content.

Data Validation: Use Assertions in your scripts to validate the data in cookies. For instance, you can assert that a user’s name stored in a cookie matches the name in their profile.

Automation Execution: Execute the automated tests across various browsers and devices using Testsigma. The tool handles the test execution and reports any discrepancies.

Regression Testing: Schedule regular automated tests to perform regression testing as the website changes. This ensures that cookies continue to function correctly.

Reporting and Analysis: Review the test reports generated by Testsigma, identifying any failures or issues related to cookies. Take corrective actions as needed.

Automated testing with Testsigma significantly reduces manual effort and ensures consistent testing across browsers and scenarios. It also supports efficient regression testing, crucial for evolving websites.



Testing cookies in a web application is essential to ensure proper functionality and user data security. Here are some significant test cases for web application cookie testing:

 1. Data Privacy and Encryption:

Test Case 1: Ensure that no personal or sensitive data is stored in cookies as per the privacy policy and design documents.

Test Case 2: If sensitive data must be stored in cookies, verify that it’s encrypted and stored securely.

Test Case 3: Check for overuse of cookies, as excessive cookie prompts can annoy users and impact site traffic.

Test Case 4: Disable cookies in browser settings and verify that the website displays appropriate messages and doesn’t crash.

Test Case 5: Randomly accept/reject cookies to test website functionality. Ensure pages do not crash or data is not corrupted.

Test Case 6: Delete cookies manually and assess website behavior.

Test Case 7: Attempt to corrupt cookies by manually editing parameters. Ensure the website remains secure, and another cannot access data from one domain’s cookies.

Test Case 8: Check if cookies are deleted correctly, especially in action or purchase tracking cases.

 5. Cross-Browser Compatibility:

Test Case 9: Test cookie functionality on multiple browsers (e.g., Chrome, Internet Explorer, Firefox) to ensure consistent behavior.

 6. User Account Security:

Test Case 10: Check if user accounts are secure by attempting to change user IDs in the address bar and verifying appropriate access controls.

Test Case 11: Verify if cookies are persistent or session-based as per requirements.

Test Case 12: Validate the expiration dates of cookies and whether they update as expected during application use.

 8. User-Specific Cookies:

Test Case 13: Ensure that user-specific cookies are deleted or ignored when another user logs in unless specified otherwise.

 9. Multi-Environment Sites:

Test Case 14: Check if cookies are acceptable in all environments, especially when using wildcards in cookie paths or different encryption keys.

By performing these comprehensive test cases, you can ensure that cookies in your web application function correctly, securely, and consistently across various scenarios and environments. 

For efficient and organized testing, consider using automation tools like Testsigma to create and execute these test cases easily.

When testing cookies on a website, several techniques can be employed to ensure their proper functionality and security. Here are some commonly used techniques:

  • Manual Inspection: This involves manually inspecting cookies using browser developer tools to ensure they are correctly set, read, and deleted. Manual testing is valuable for understanding cookie behavior in real time.
  • Functional Testing: This technique tests the functionality associated with cookies. For instance, it verifies that login sessions are maintained, personalized content is displayed correctly, and shopping cart items are stored accurately.
  • Security Testing: Cookie security testing aims to identify vulnerabilities such as cookie manipulation or unauthorized access to sensitive information stored in cookies. Security testing helps safeguard user data.
  • Automated Testing: Automated testing tools like Selenium or Testsigma can create test scripts that interact with the website and validate cookie-related functionality and data integrity across different browsers and scenarios.
  • Performance Testing: Performance testing assesses how cookies impact website loading times. It ensures that cookies are optimized and do not slow down the website’s performance.

Here’s a table outlining the advantages and disadvantages of cookie testing:

AdvantagesDisadvantages
1. Ensures Data Integrity: Cookie testing ensures that data stored in cookies accurately reflects user interactions.1. Time-Consuming: Manual testing can be time-consuming, especially for complex websites with numerous cookies.
2. Enhances Security: Identifies and mitigates security vulnerabilities associated with cookies, protecting user data.2. Limited Coverage: Manual testing might not cover all possible scenarios and edge cases.
3. Improves User Experience: Ensures that cookies function correctly, enhancing the overall user experience.3. Automation Complexity: Setting up and maintaining automated cookie tests can be complex and require technical expertise.
4. Facilitates Compliance: Helps websites adhere to privacy regulations by verifying proper user consent and data handling.4. Resource Intensive: Automated testing tools and infrastructure can be resource-intensive to set up and maintain.
5. Supports Regression Testing: Enables regular regression testing as websites evolve, ensuring ongoing cookie functionality.5. False Positives/Negatives: Automated tests may produce false positives or negatives if not configured properly.

Cookie testing is crucial for maintaining a secure, compliant, and user-friendly web presence. While it offers numerous advantages, it’s essential to consider the associated challenges, especially regarding manual vs. automated testing and the balance between thoroughness and efficiency in testing efforts.

Conclusion

Cookie testing is vital to web development and quality assurance, ensuring that cookies function correctly, adhere to privacy regulations, and enhance user experiences. Whether performed manually or through automation, cookie testing plays a pivotal role in maintaining data integrity, security, and compliance while supporting the evolving needs of modern websites.

Frequently Asked Questions

Cookie testing is essential because it verifies that cookies accurately collect, store, and transmit data, ensuring data integrity. It also aids in compliance with privacy regulations, protects against security threats, and enhances user experiences by validating critical website functions tied to cookies.

How do I set cookies for testing?

You can use browser developer tools or scripting languages like JavaScript to set cookies for testing. For manual testing, you can use browser console commands to set cookies. In automated testing, testing frameworks like Selenium or tools like Testsigma provide functions for setting cookies programmatically, allowing you to simulate user interactions for testing purposes.

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