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The planning and implementation of test automation should always be treated as an independent software project. This means that the common principles, processes, and practices found in software development also apply to test automation. These include clear requirements, a well thought out architecture, solid implementation methods, and quality assurance measures such as code reviews and systematic testing.
System understanding is essential for test automation
There is, however, one major difference from many traditional software projects. Test automation systems must be adapted to the system or device under test. This requires test automation engineers to have a understanding of the entire system. In the embedded domain in particular, it is essential to understand not only the software but also the hardware, sensors, and interfaces involved. Knowing how these components interact is crucial for developing a reliable test automation system.
Early integration of test automation into system design
The foundation for successful test automation is laid during the architectural design phase of the device under test (Device under Test, DuT). Ideally, the DuT architecture should be designed in a way that promotes testability and enables automation from the start. This is especially important with regard to suitable interfaces that allow insight into the DuT and enable targeted control of it.
In addition, logging functions or mocks should be planned early to make future test activities significantly more efficient and flexible. If these aspects are added later, the effort and complexity increase, which can limit the overall testability.
Architecture and design of the test automation system
Once the architecture of the DuT is defined, the architectural design of the test automation system begins. This phase determines how the automation architecture will be structured, which tools and components will be used, and how they will interact with the DuT. Classical software design principles apply here as well, such as modularity, extensibility, and maintainability.
Synchronizing development processes
The development processes of the DuT and the test automation system must be closely coordinated. Changes to the DuT, such as new requirements, added features, or hardware modifications, can affect the automation system. Conversely, the test automation team can influence the evolution of the DuT, for example when certain test interfaces are missing or need to be adjusted.
Close communication and regular information exchange between both teams are therefore essential. This collaboration helps identify dependencies early and address them appropriately.
Conclusion
Test automation is not an isolated discipline but an integral part of the entire development process. By integrating automation early in the design phase, planning the architecture carefully, and coordinating closely between development and testing teams, organizations can build a strong foundation for efficient, reliable, and sustainable test automation solutions.
