TYPO3 Core

does it influence the git subtree split or just the composer packages?
What is the influence on the users? Please give more context here.

Tymoteusz Motylewski wrote:

does it influence the git subtree split or just the composer packages?
What is the influence on the users? Please give more context here.

Since the Composer packages only exist thanks to the Git subtree split it affects both.

The user will have TYPO3 packages without the Tests directory.

If you install typo3/cms (still possible with v8) you don't have any Tests directories in typo3/sysext/* thanks to the toplevel .gitattributes definition. However, if you install typo3/cms-* instead you will have them. This change addresses that by adding a separate .gitattributes file per package.

To check the result of what Composer would produce you can use the following command to e.g. create a package for the core system extension after switching to its directory in the TYPO3 source:

git archive --format zip --output ../core.zip HEAD .

Without any change, you'll get an archive including the Tests directory. With the suggested change that directory will be gone as desired.