Portability testing with TMAP

What is portability, really?

The official TMAP glossary provides a tight definition for this concept. It is the degree to which a system, product, or component can be effectively and efficiently transferred from one hardware, software, or other operational or usage environment to another. In short: it is an official ISO 25010 product quality attribute.

Translating this into plain human language, we are simply talking about the transferability or moveability of your software. It means that an application is not picky. The software should run just as easily on a developer's local Windows laptop, in a Linux container in the AWS cloud, or on an end user's smartphone. This quality attribute therefore looks at how flexibly the software handles a change in the foundation it lives on.

Why does transferability matter?

You might wonder why you should spend extra time on this. The software works fine in the cloud right now, right? So what? If you don't think about this from the very beginning, you will run into a brick wall later on. This attribute is indispensable for any modern IT team for three major reasons:

• 1. Velocity in your deployment pipeline
  In an Agile or DevOps environment, you want to continuously integrate and deploy code (CI/CD). If software has low portability, it means you have to manually adjust settings at every step to a new environment. Testers have to wait, the pipeline gets stuck, and the release slows down. Software with a high degree of environment independence flows through the pipeline without friction.
• 2. Flexibility and cost savings infrastructure changes rapidly.
  Today your application might run on an on-premise server in the office, but tomorrow management decides everything must move to Microsoft Azure. If your application is rusted to specific hardware characteristics, such a migration costs months of work and a fortune in budget. Easily portable software makes your organization agile. You can switch vendors or cloud providers whenever you want, without having to rebuild the entire application.
• 3. Fewer vague issues at the support desk
  End users always do something different than the team expects. They use outdated browsers, slightly different screen sizes, or a specific operating system that has just hit the market. When the flexibility of the software environment is low, detailed bugs surface that you could never have predicted in your test environment. The helpdesk then bears the brunt of features refusing to load. By testing for portability upfront, you catch these issues before they impact the customer.

Recognizable situations: where does it often go wrong?

To make portability tangible, let’s look at a few situations you probably recognize from your daily work.

• The hidden database dependency
  A team builds a new application. On the developers' laptops, a local database runs (for example, PostgreSQL version 15). Everything works like a charm. However, the staging environment uses PostgreSQL version 14 because system administrators keep that version centrally up to date. During the testing phase, a specific search function suddenly fails because version 14 does not support a certain piece of database code. This is a typical example of a lack of portability due to a hidden dependency.
• Hardcoded file paths
  This is a classic mistake that still occurs surprisingly often. Somewhere in the code, a reference to a file path is written, such as C:\Application\Data\Uploads. This works perfectly as long as the software runs on a Windows server. But when the company transitions to cloud containers running on Linux, the system does not recognize this folder structure at all. The application crashes immediately at the very first file upload.

The role of Docker and Infrastructure as Code (IaC)

Many teams think they have completely solved this problem by using Docker containers and Infrastructure as Code (IaC). After all, this allows you to package the software and the environment together. While that helps enormously, it is not a silver bullet. Because how does that container behave when it suddenly has to run on a server with a completely different processor architecture (like an ARM chip instead of an Intel chip)? And what happens if the network settings in the cloud are just a bit stricter than on your own laptop? Tools do not automatically solve transferability for you; you still need to check it consciously.

How do you make portability more specific and testable

Within the philosophy of TMAP: Quality for Cross-Functional Teams, quality is not a task you throw over the fence to a tester at the last minute. It is a shared responsibility of the entire team. How do you approach testing this moveability concretely?

Include it in the product risk analysis (PRA)

Before you start building, the cross-functional team comes together for a product risk analysis. Here, you discuss which quality attributes are important for the product. Ask the product owner and the operations engineer: what are the minimum platforms this needs to run on? What migrations do we expect in the future? If portability carries a high risk, give it a prominent place in your test approach.

Testing as a non-functional variety

Portability testing falls under the non-functional test varieties. You don't look at whether a button functionally does what it's supposed to do, but how the software responds to the relocation itself. TMAP advises paying specific attention to three sub-characteristics:

• Adaptability: Can the software adapt to different systems or devices without issues?
• Installability: How easily and flawlessly can the software be installed or deployed in a new environment?
• Replaceability: Can this software easily replace another component within the same environment?

Deploy exploratory testing smartly

A structured way to test this is by using exploratory testing (experience-based testing) across different contexts. A tester, developer, and operations engineer can co-create a 'test charter'. In it, they agree to consciously install and use the application on three very different configurations within an hour. Do you build teams based on assumptions, or do you choose explicit scenarios? By putting this variation into practice, misunderstandings about ambiguous requirements come to light immediately.

Build built-in quality with Testlearning

Preventing environmental errors requires a broad perspective from the entire team. As an IT professional, you need to understand how software quality is woven into the entire lifecycle of an application, from the initial idea to production management. If you only start testing when the code is already waiting for production, you are too late, and fixing errors will cost a massive amount of time.

In the e-learning TMAP: Quality for Cross-Functional Teams, you will learn exactly how to make quality attributes like portability discussable and measurable right from the start within your Agile or DevOps team. You will gain practical tools to set up the right test strategy together with your team. No dry, theoretical summaries, but recognizable practical lessons that you can apply directly to your own projects. This helps your team deliver software that truly runs stably and smoothly everywhere.

Ready for the next step?

Do you and your team want to make the shift from fighting fires in hindsight to built-in quality from the very beginning? Ensure that everyone in the team speaks the same language and possesses the right testing skills. Check out the TMAP: Quality for Cross-Functional Teams e-learning directly and discover how the e-learning helps your team reach a higher level of software quality.