This test adds a fixture RelativeSymlinks.zip with the following
structure:
RelativeSymbolicLink
├── symlinkedFile
├── symlinkedFolder
└── symlinks
├── fileSymlink -> ../symlinkedFile
└── folderSymlink -> ../symlinkedFolder
The test checks if both `fileSymlink` and `folderSymlink` still point to
the respective files in the parent directory after the fixture has been
unzipped.
Ahmed Hamdy