The heading of this post could engender a colossal debate. Should Developers be the ones to evaluate their own code – what would be the result of this testing? Almost always, a rosy picture! Naturally, the code’s creator often only notices the ideal scenarios for the product and prefers not to delve into greater detail.
The main problem with Testing by Developers is – misapprehension of requirements. If the developer misinterprets the requirements, then no matter the extent to which the developer scrutinizes the application, errors will remain undetected.
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Any error introduced initially will persist till the end, as the developer perceives it as a feature.
Positive-minded Developers – Absolutely, I crafted the code and I’m certain it operates flawlessly. There’s no need to evaluate any scenario, as I am convinced it performs perfectly. This is when developers overlook the Bugs.
Developer vs Tester: A Developer perpetually wants their code to function as intended. So, they test to verify that it does. However, have you ever considered the tester’s motives? A tester always endeavors to find a way to disrupt the application, to investigate how and where it does not work as it should. This forms the main distinction between Developer Testing and Tester Testing.
Can Developers Evaluate Their Own Creations?
I, personally, have no problem with developers scrutinizing their own code. After all, they are its creators 🙂 They understand their code more intimately than anyone else. They are aware of its pitfalls.
They can predict where it might fail, what areas to focus on, which is the most critical pathway of the application, and so on. Developers are quite capable of unit testing effectively and identifying boundary conditions.
All of this is true for a developer who is also a skilled Tester! Alas, testing is seen as a daunting task by most developers. Though they know the system well, their inadvertent neglect often results in skipping several testing pathways.
If developers manage to detect flaws in their code during Unit Testing, fixing them would be relatively convenient, especially since the code is fresh in their minds. This, however, only occurs if developers are enthusiastic about thorough testing.
It is Testers’ responsibility to ensure that every path is checked. Every minor detail matters to a tester; it’s their job to verify that the application does not falter at any point.
Developers – please don’t review your own code in isolation. Generally, you are more likely to miss issues within your code. So, others should review it.
Everyone specializes in a particular area. While developers generally concentrate on the construction of the application, testers, on the other hand, consider the application from the perspective of the end-user.
Final Thoughts
In sum, there’s no harm in developers conducting basic Unit Testing and preliminary verification tests. Developers could test a few distinct scenarios they perceive as important and unmissable. But, there are exceptional testers out there.
Additional Reading =>> Software Engineer vs Developer
Forward the build to the testing team; don’t waste time. The success of any project depends on having an independent testing team examining your applications. After all, making the code (the ‘child’) smarter is our (testers’) responsibility!
So, what’s your opinion?
Feel free to share your views in the comments section below!