Is directory name `test` treated in a special manner?

If I have a directory named mypackage, it is recognized as a package without me having to do anything (not even mark it as a source directory or create a __init__.py file):

If however I simply change the directory's name to test, it is no longer recognized as a package (import does not work). Why is that? Is the name test treated differently? That does not seem to be documented anywhere that I could see.
(Adding a __init__.py file does get the example to work, but that still does not explain the different behavior based on the name.)

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Hello there,
Could you please check where Jump to definition leads (CTRL/ Command + Click) if you click on test in from test.testing_util import foo?

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Ah, there is a built-in Python package testI was not aware of that's being picked up before my own definition of test. And, of course, the built-in package does not contain a testing_util module, so this generates the error.

Thanks for helping!

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