Checking is in the core of Test-Driven-Development (TDD).
Developers’ initial point of starting development is writing a check and then writing a little code to make sure that check passed. They build up their project according to that principle to be sure that their code works properly. Developers and other people from the industry call these “unit tests”. It’s a common mistake to have testers write unit tests. These checks help developers write clean code, thus it is their tusk writing unit codes, not testers’. No matter how helpful unit tests are when writing code, leaning on them is not enough either. Writing these checks are helping us to be sure that individual functions or features are working well on low level. Remember, that “unit tests” cannot give us status of mixed functions or features together. For integrations we cannot use our “unit tests”, so it’s another topic to discuss.
Of course, many managers argue that developers waste their time on writing some checks. Everyone should understand, that one day they need to update or modify their code. The question here is how they are going to check if everything is OK or no? No matter how much time you waste on manual checks, they can never guarantee that on low level everything is correct. And of course, more time will be wasted on manual checks than writing “unit tests”.
It’s very important to understand why Test Driven Development is important in Software Development Lifecycle. TDD enables us to deliver new functionality and modify existing code in a reasonable timeframe, without losing money. So, TDD helps us to break the negative feedback loop and maintain money and time.
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