Information about creating test codeunits and maybe some examples

Hey guys, 

currently I am trying to write my first test codeunit, therefore I need a lot of information.

I have already dealt with the site of Microsoft, but since then I have more questions...

Do you have any documentation or tips where to get such information? 

Also examples to demonstrate how such tests look like, like a general testing would be welcome. 

It would be enough for me if I could see such a testing as an example for a page.

Thank you so much.

If you want to learn how to write test codeunits, then the best place to start is in [mention:5241d4a0c2cb47ca937f46e444a2185c:e9ed411860ed4f2ba0265705b8793d05]'s blog [mention:86b6a885eaf14c2b8dbc3d2c007ffb3f:ca0e7c8086864d2fa5a863b9e212e922].

You also find a few presentations about the subject on youtube,If you prefer video.

https://www.youtube.com/watch?v=E7lNaa49t8E&t=1416s