Add test for issue #302.
Test creates one evil blob and two critical symlinks in two different folders:
.
├── foo # contains 'link foo'
└── link_1 -> foo
└── folder
├── foo
└── link_2 -> foo
Test creates one evil blob and two critical symlinks in two different folders:
.
├── foo # contains 'link foo'
└── link_1 -> foo
└── folder
├── foo
└── link_2 -> foo