Testlio’s software functional testing checklist helps QA and engineering leaders think strategically about functional, regression, and exploratory testing approaches.  

Even when seamlessly combining manual and automated approaches, testing every functional combination within web or mobile applications is challenging. Unfortunately, this means critical issues inevitably go undetected and make their way into the hands of your customers.

“All imperfection is easier to tolerate if served up in small doses.” 

Wisława Szymborska

We strive for perfect code, perfect releases, and perfect apps, but alas, perfection is a myth. With that in mind, if you cannot catch every issue before a release, at least you can take the proper steps to limit them.

Testlio’s functional testing checklist combines years of crowdsourced testing (and lessons learned from trial and error!) to quickly address many of the challenges faced by our software clients. Apply these techniques and expect fewer bugs sneaking into production and a better overall customer experience.

What you’ll learn from the checklist?

  • Why integrating with test management tools and issue trackers like Jira, GitHub, Asana, Trello, Azure, Shortcut, and Pivotal Tracker is critical.
  • Eight steps to take before writing functional test cases.
  • Tips for writing detailed test cases that give you the best overall test results.
  • What to consider for functional test runs.
  • The pros and cons of writing your functional test cases.
  • Tips for filtering test results so your engineers will love you.
  • How to build a functional testing feedback loop.

Functional testing best practice examples covered in the checklist.

After developing basic test case scenarios and flows, leverage your in-house QA (or augment them with on-demand crowdsourced testers) to conduct structured exploratory testing. Inevitably, they will quickly come up with scenarios you hadn’t considered. Translating these “what ifs” into clear test cases requires experience and creativity, and they become an essential part of your regression testing.

Engagement Manager, Marielle Tamkorv and Testing Manager, Paulo Feitosa – Testlio

An exceptional functional test case has a high level of detail and information for the tester (e.g., test data, execution preconditions, expected result) to ensure that all the functionality under test is working as expected. As a result, good testing uncovers bugs and provides an overview of the coverage – what was tested, what is working, what is not working – to assess risks and make release-related decisions.

Testlio Engagement Manager, Kaisa Paavo

Make sure your bug reports show all areas that passed in addition to which had issues. Yes, catching what’s broken is essential. However, peace of mind comes from knowing that your software works as intended too. For that reason, we don’t encourage paying outsourced testers by the bug (i.e., bounty hunting) because they lack the incentive to report on what’s working.

Engagement Manager, Jennifer Khosravi – Testlio


Functional testing is perhaps the most critical type of software testing, as it validates if your product features work according to their intended requirements (or don’t work as intended). In either case, quickly learning that your app is fully functional or laden with bugs is mission-critical for more confident releases.

Testlio’s software functional testing checklist offers a deeper look into running more efficient functional, regression, and exploratory software testing. In addition to the list of actionable steps, we hope you take advantage of the functional testing feedback loop that improves overall testing by melding functional, regression, and exploratory testing. It’s a tried and true approach that will lead to better end-user experiences.

Tim Ryan serves as the Director of Marketing for Testlio and spends his time between Austin, TX and New Orleans, LA.