Website Testing Explained: QA, Manual Testing, Automation Testing & A/B Testing for WordPress and Shopify

A website can look beautiful and still have broken forms, slow-loading pages, checkout errors, or a confusing user experience. These problems can affect customer trust, sales, and lead generation.

Whether you run a WordPress business website, a WooCommerce store, or a Shopify eCommerce business, testing is an essential part of building and maintaining a reliable website.

Website testing helps you identify problems before customers encounter them. It also helps you understand how visitors interact with your website and which improvements can make their experience better.

In this guide, we’ll explore the different types of website testing, including quality assurance (QA), manual testing, automated testing, and A/B testing. You’ll also find practical WordPress and Shopify testing checklists you can use before launching a website or updating an existing one.

What Is Website Testing?

Website testing is the process of checking a website’s functionality, usability, performance, compatibility, and reliability to make sure it works as expected.

Testing can be performed before a website goes live, after a redesign, following a plugin or theme update, or whenever new features are introduced.

For example, a WordPress website might need its contact forms, navigation, mobile layout, and email notifications tested. A Shopify store might require additional checks for product variants, discount codes, cart functionality, shipping rules, and checkout.

The goal is simple: identify issues early, improve the user experience, and reduce the risk of website problems affecting your business.

1. Quality Assurance (QA) Testing

Quality assurance testing is a broader process used to maintain website quality throughout development and maintenance. It involves defining requirements, creating test plans, checking functionality, identifying defects, and verifying fixes.

QA is not limited to finding bugs after development. It also helps prevent problems by establishing clear requirements and testing procedures.

What does website QA include?

• Functional testing of website features
• Checking forms and user interactions
• Verifying links, navigation, and page layouts
• Testing mobile responsiveness
• Reviewing browser compatibility
• Checking website performance
• Retesting issues after fixes
• Validating important business workflows

Example: WordPress website QA

Imagine a business website has a contact form that displays a success message but doesn’t deliver the enquiry email.

A QA process would check the form submission, server-side validation, email delivery, error handling, and confirmation message. The problem can then be identified and corrected before more enquiries are missed.

Best for: New website launches, major updates, redesigns, eCommerce projects, and ongoing website maintenance.

2. Manual Website Testing

Manual testing involves checking a website by interacting with it as a real visitor would. A tester opens pages, clicks buttons, enters information, submits forms, and verifies that the expected results occur.

It is particularly useful for identifying usability issues and unexpected behaviour that automated checks might not fully capture.

Examples of manual testing

• Click every important navigation link.
• Submit contact and enquiry forms.
• Check validation messages for empty or invalid fields.
• Test dropdowns, sliders, popups, tabs, and menus.
• View pages on mobile, tablet, and desktop screens.
• Check product filters and variant selection.
• Add products to the cart and verify quantities.
• Test discount codes and shipping options.
• Confirm that confirmation messages appear correctly.

Manual testing example for Shopify

Suppose a customer selects a ring size, chooses a metal colour, and clicks Add to Cart.

Manual testing should verify that the selected variant, price, availability, and cart information are correct. It should also check how the product page behaves when the customer changes their selection or chooses an unavailable variant.

These practical checks can reveal issues that a simple page-loading test would miss.

Best for: Interactive features, usability checks, new designs, custom functionality, and reproducing reported bugs.

3. Automated Website Testing

Automated testing uses scripts or testing tools to perform repeatable checks with minimal manual intervention.

Instead of repeatedly checking the same functionality by hand, developers can automate selected tests and run them after code changes or during deployment.

Popular tools include Playwright, Cypress, Selenium, and Jest. The right choice depends on the website, its technology, and the type of test required.

What can you automate?

• Checking whether important pages load
• Testing navigation and buttons
• Submitting forms with test data
• Verifying required fields and validation messages
• Checking selected user journeys
• Testing JavaScript functions
• Running regression tests after updates
• Confirming that previously fixed bugs do not return

Automated testing example

Consider a WooCommerce store where a developer changes the product page layout.

An automated test could open a product page, select a variation, add the product to the cart, and verify that the expected item appears in the cart.

The test can then be repeated whenever related code changes.

However, not every website task needs automation. For a small brochure website with a few pages, a well-planned manual checklist may be sufficient. For a large eCommerce website with frequent updates, automated regression tests can save time and improve consistency.

Best for: Large websites, frequently updated stores, repetitive workflows, and projects that require regular regression testing.

4. A/B Testing for Websites

A/B testing is different from ordinary QA testing.

QA checks whether a feature works correctly. A/B testing compares two versions of a page or element to measure which performs better against a defined goal.

For example, you might compare two different product page layouts to determine which generates more add-to-cart actions.

Common A/B testing ideas

• Two different headlines on a landing page
• Different call-to-action button text
• Alternative product image layouts
• Different product descriptions
• A simplified enquiry form
• Different placements for trust information
• Alternative product page layouts

Example: A/B testing a Shopify product page

Imagine your Shopify store receives visitors but relatively few people add products to their carts.

You could test two versions of the product page:

Version A: The existing product layout.

Version B: A revised layout with clearer product details, more visible delivery information, and a prominent Add to Cart button.

Measure the add-to-cart rate and other relevant metrics to understand whether the new version performs better.

A meaningful test should have one clear hypothesis, a defined primary metric, and enough data to distinguish a real improvement from random variation. Avoid changing multiple unrelated elements simultaneously if you want to understand what caused the difference.

Best for: Conversion optimization, landing pages, product pages, lead-generation forms, and eCommerce businesses with sufficient traffic.

QA vs Manual Testing vs Automation Testing vs A/B Testing

Although these testing methods are related, they serve different purposes.

These methods can complement one another. A website may need manual QA for a new feature, automated regression tests for existing functionality, and A/B testing to evaluate a later design improvement.

5. WordPress Website Testing Checklist

WordPress websites can use different themes, plugins, page builders, custom code, and third-party integrations. Testing should cover the features that your particular website relies on.

Before launching a WordPress website

• Check that all important pages load correctly.

• Test the navigation menu and internal links.

• Submit every important contact or enquiry form.

• Confirm that form notifications reach the intended inbox.

• Check the website on mobile, tablet, and desktop.

• Verify buttons, popups, sliders, and interactive elements.

• Review page titles, meta descriptions, and indexing settings.

• Check images, fonts, and layout consistency.

• Review HTTPS, backups, and appropriate security settings.

• Test redirects and important URLs if migrating or redesigning.

After a WordPress update

WordPress core, theme, or plugin updates can affect existing functionality. After significant changes, check the pages and features most likely to be affected.

Pay particular attention to:

• Contact forms and email delivery
• Elementor or other page builder layouts
• Navigation, sliders, and JavaScript interactions
• WooCommerce cart and checkout
• Login and account-related functionality
• Third-party API integrations
• Caching and optimization settings

If your website experiences recurring technical issues, read the guide to WordPress maintenance costs in India to understand why ongoing maintenance and timely fixes matter.

6. Shopify Store Testing Checklist

A Shopify store needs more than a visual review. The complete shopping journey should work correctly, from product discovery to checkout.

Product and collection testing

• Verify product titles, descriptions, images, and prices.

• Test product variants such as size, colour, and material.

• Check inventory and availability messages.

• Test collection filters, sorting, and search.

• Verify product recommendations and related products.

• Check mobile product galleries and sticky purchase buttons.

Cart and checkout testing

• Add products to the cart.

• Update product quantities and remove items.

• Verify discount codes and promotional rules.

• Check shipping rates and delivery information.

• Test supported payment methods using the appropriate test mode where available.

• Verify order confirmation and customer notifications.

• Confirm that order details and totals are correct.

Do not make unnecessary live purchases simply to test checkout. Use Shopify’s supported test options where available, or plan a controlled live transaction with a clear refund procedure.

Theme and integration testing

Shopify themes can contain custom Liquid code, app embeds, scripts, metafields, and external integrations. After theme changes, verify that these features still behave correctly.

For more practical ideas, read How to Optimize Shopify Product Pages for More Sales in 2026 and the guide to Shopify Speed Optimization.

7. Website Performance, Compatibility, and Security Testing

A website can pass its basic functionality checks and still provide a poor experience because it loads slowly, breaks on certain devices, or exposes security weaknesses.

Performance testing

Measure important pages using tools such as Google PageSpeed Insights and Lighthouse. Review Core Web Vitals, image sizes, JavaScript execution, caching, and other factors affecting the user experience.

Test key landing pages and product pages on mobile as well as desktop. A fast homepage does not guarantee that every product or checkout-related page performs equally well.

Cross-browser and responsive testing

Check the website on commonly used browsers and screen sizes. Look for overlapping text, broken menus, horizontal scrolling, buttons that are difficult to tap, and elements that fail to respond.

Security testing

Review user permissions, software updates, form validation, HTTPS, and access controls. Custom forms and integrations should validate data on the server, not rely exclusively on browser-side checks.

Security testing for complex systems may require specialist tools or professional assessment. A basic website checklist should not be treated as a complete security audit.

8. Useful Website Testing Tools

Different tools help with different parts of the testing process.

Choose tools based on your actual testing requirements. You don’t need every tool for every project, and a good tool cannot replace a clear test plan.

9. When Should You Test Your Website?

Website testing should be part of an ongoing workflow rather than a one-time activity.

Consider testing when:

1. You launch a new website or online store.
2. You redesign important pages.
3. You install or update a plugin, app, or theme.
4. You introduce a new feature or API integration.
5. You change checkout, payment, or shipping rules.
6. You notice a drop in enquiries or sales.
7. You make significant performance or security changes.
8. You want to compare design variations through A/B testing.

For complex changes, test on a staging environment when possible, back up important data, and verify critical user journeys after deployment.

10. Common Website Testing Mistakes to Avoid

Even experienced website owners can overlook important checks.

Testing only on desktop: Mobile visitors may encounter different layout, navigation, or checkout problems.

Checking only the homepage: Product pages, forms, landing pages, and checkout flows can have separate issues.

Assuming a success message means success: A form may display confirmation even when the email or backend process has failed. Verify the actual result.

Relying only on automated tests: Automation is useful for repeatable checks, but manual inspection remains important for usability and unexpected behaviour.

Running A/B tests without a clear goal: Decide what you want to improve and how you will measure it before starting the experiment.

Ignoring testing after updates: A small code or plugin change can affect a feature that previously worked correctly.

Conclusion: Make Website Testing Part of Your Development Process

Website testing helps protect the user experience, identify defects, and maintain reliable functionality as your website evolves.

QA provides the overall quality process, manual testing checks features through direct interaction, automated testing repeats important checks efficiently, and A/B testing helps compare alternatives to improve measurable outcomes.

For WordPress and WooCommerce, focus on forms, plugins, layouts, performance, and checkout. For Shopify, pay particular attention to product variants, cart behaviour, discounts, shipping, payments, and theme customizations.

You don’t need to use every testing method on every website. Start with a checklist based on your website’s most important features, test changes carefully, and expand your process as your website grows.

Need Help Testing or Improving Your Website?

I’m Hemant, the developer behind TheMan Freelance. I work directly with businesses on WordPress, WooCommerce, and Shopify development, including custom functionality, bug fixing, performance optimization, redesigns, API integrations, and ongoing maintenance.

If your website has broken features, inconsistent layouts, checkout issues, or performance problems, I can help identify the technical issues and recommend practical improvements.

Explore my services:

• WordPress Development
• Shopify Development
• WooCommerce Development
• WordPress Plugin Development