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Unit tests in TDD

I'm new to TDD, and the first question that came to my mind is whether unit tests should be applied for each component developed. I ask for this, since I noticed that unit testing takes a lot of time, especially when some changes to the requirements are provided. So, could you suggest something like TDD best practices regarding unit testing?

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A brief description of TDD, expressed in three rules :

  • You are not allowed to write any production code unless it fails the unit test.
  • You are no longer allowed to write unit test than enough to fail; and compilation failures - crashes.
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: http://jamesshore.com/Agile-Book/test_driven_development.html

: http://www.growing-object-oriented-software.com/

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Tests lead to the development of your code. TDD is really everything to determine the desired behavior of your software, the fact that everything it checks is a good side effect.

A good essay on TDD is available here.

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Source: https://habr.com/ru/post/1754009/

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