Curated by: Sergio A. Martínez

Creating software can be compared to solving a big, complex puzzle. A developer needs to take a bunch of pieces (code, algorithms, requirements, deadlines, etc.) and put them together in the right way to create a functioning product that satisfies everyone involved, from clients to final users. And just like with a puzzle, there is no single “right” way to develop software; it depends on the individual developer’s preferences and style, where some may start by laying out all of the pieces and looking for patterns, while others may start assembling pieces and then adjust as they go along. 


And the biggest challenge is that if even one piece is out of place, it can throw the entire system off balance. This is why, besides having a good team of developers able to see the big picture and break it down into manageable tasks, a good QA Tester is so critical to obtaining the best possible outcome during development. Only then can you hope to create a successful piece of programming.

That’s why having a good approach to QA is so important; having experienced testers whose toolset matches the requirements of the product, capable of coming up with a plan for how they will test the code as they write it, as well as having a deep understanding of what “quality” means for the project, is a must in any team. 

So, in that sense, we want to take a look into one of the most important processes of QA: test cases. Because beyond running automated tests and manual testing, QA involves a systematic approach where developers can avoid costly mistakes and create products that meet customer expectations. And in practice, how can you design the perfect test case? What considerations should you have, and what’s the best approach to document and keep track of the sometimes messy process of QA?

Test cases are simple: Just think of everything

When it comes to software development, well-designed test cases are essential. By carefully planning out each test case, developers can ensure that their code will be thoroughly tested for errors, and taking the time to design comprehensive test cases can save a lot of time and effort in the long run. But how should you approach this task in practice? Is there a trick to designing a good Test Case?

It depends on the project”, says Angie Lobato, a Quality Assurance Analyst at Scio with a wide range of expertise in everything QA. “The ISTQB already mentions that 100% thorough testing is not something that is possible, so it comes down to the priorities of the team, the requirements, the severity of the bugs, and the timelines set to deliver the product, as well as how much time the person in charge of QA has.

This is why knowing how to design a test case is so important; considering all the challenges that software development already faces, being able to write an efficient, timely, and thorough test case is a valuable skill, keeping in mind things like… 

  • Thinking about the expected behavior of the system under test. What should it do in various scenarios?
  • Choosing input values that will exercise all relevant parts of the system.
  • Designing tests that will detect errors, but also verify that the system behaves as expected.
  • Keeping track of all tests performed, including pass/fail status and any observations made.

However, saying this is easier said than done; it can be difficult to create comprehensive test cases that cover all possible scenarios, and as software becomes more complex, replicating customer environments to test for all potential issues requires some intuition and minute attention to detail. That’s why the design of your test cases has to start with a script as the basis of the test, documented and shared to see exactly what you are trying to accomplish. For this process, Angie tells us that…

I first need to validate that the Test Case (TC) related to the specific item I’m checking doesn’t exist yet, and do whatever is necessary, like adding, taking out or updating steps to not end up with a suite of repeated test cases”, she explains. “To design the script, it’s always good to create them in their respective suite, with a link to the requirement so everybody in the team can easily find them (I’ve personally used TFS, Azure DevOps, and Jira) depending on the tools utilized during the project. For the script itself, I define the objective of the Test Case, as well as the preconditions and postconditions it needs. Once that has been taken care of, I start to retrace the steps necessary to reach the item I need to test. I add each needed step to achieve the objectives of the test case with their expected result, and finally, I validate the final results where the change needed to be reflected.

As you can see, there’s a lot of documentation involved in designing a test case, and having the proper formats to keep everything in order (like this one) helps to make sure that each test is accomplishing what it needs to. And according to Angie, a good test case needs a couple of characteristics to make it good:

  • A good test case has a clear objective stated and is updated to the latest version of the project. 
  • Has all the necessary testing data to execute it without creating repeated information. 
  • Has defined all the preconditions and postconditions of the product. 
  • And most importantly, don’t try to test more than one thing in a single case.
  • However, if you need to, changing the parameters of the test is necessary to make that clear. 
  • An ideal test case shouldn’t have more than 10 steps in total.

Ensuring quality at a distance


As anyone who has ever been involved in software development knows, QA is a critical part of the process, and a good test case can help to ensure that the final product meets the requirements of the customer and is free of issues, especially in the current development landscape where remote collaboration is becoming a given. 

For a Nearshore development team like the ones at Scio, a well-crafted, carefully designed test case is invaluable, helping to ensure that the team and the client is on the same page concerning the expected results of the testing process, and providing a clear and concise way to communicate those expectations to everyone involved. 

In other words, a good test case can help to streamline the testing process and make it more efficient, so taking the time to create a good test case is well worth the effort for any remote software development team. 

Any company that outsources software development knows that collaboration is key to success. A good QA team is essential to ensuring that the final product meets the standards”, says Adolfo Cruz, PMO Director, and Partner at Scio. “In a Nearshore setting, they are especially beneficial because they ensure that any problems are found and fixed quickly before they have a chance to cause major problems. As a result, well-designed test cases play a vital role in ensuring the success of a remote relationship.

The Key Takeaways

  • Quality is necessary at every step of the process of developing software, not only a concern in the final product.
  • A good example is test cases, how important they are to the process of QA, and what good practices get involved in designing one.
  • A well-designed test case is straight to the point, meticulous, and tries to think of all the context around the product in order to ensure the best quality possible.
  • Also, the process of designing a good test case is doubly important when working on a project remotely, helping keep everyone on the same page and track all the changes and corrections necessary to bring the best possible outcome. 

Scio is a Nearshore software development company based in Mexico where we believe that everyone deserves everyone should have the opportunity to work in an environment where they feel like a part of something. A place to excel and unlock their full potential which is the best approach to creating a better world. We have been collaborating with US-based clients since 2003, solving challenging programming puzzles, and in the process showcasing the skills of Latin American Engineers. Want to be part of Scio? Get in contact today!