UT improvement : Check that symlinks resources are preserved during git clone

[axel3rd]

Following #20, some tests fail when symlinks resources are not preserved during git clone :

DirectoryScannerTest.testFollowSymlinks:186 null
DirectoryScannerTest.testFollowSymlinksFalse:155 expected:<9> but was:<11>

In this case, the core.symlinks option should be used:

git clone -c core.symlinks=true https://github.com/codehaus-plexus/plexus-utils.git

[belingueres]

You need to run the command as Admin too.
IMO a comment in the README.md should be enough. WDYT?

[axel3rd]

IMO a comment in the README.md should be enough. WDYT?

core.symlinks=true + admin mode are required. README is a way, but this is the goal of #25 with message and UT skip.

[belingueres]

It turned out that I'd been working on a similar issue some time ago. See MSHARED-574. Please check if the applied solution for that issue fits your current needs.

[axel3rd]

Please check if the applied solution for that issue fits your current needs.

This solution seems fail the unit test on Windows 10 (if admin mode & git option not set) ; The PR discussions (maven-shared#16 & plexus-utils#25) say that a better approach is not execute this unit tests (but no fail).