Testing is hard because there are not many books or articles that show you how to properly test things. Especially for non-trivial stuff like concurrency or validation or not producing memory leaks or not having side effects.
While there aren't as many books on testing as there is on development there is quite a lot of information out there. There is value in developers learning the core of what testing is as a skill. There's more to doing it well than most people think.
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