Test repo for yarn install.

Steps for reproduce:

1. Let's clone repo:

   git clone git@github.com:shvar/yarn-install.git && cd yarn-install/project
   

2. Get initial deps:

   yarn install
   

3. Create symlinks and see the structure:

   ./create_symlinks.sh && find .. | grep -v .git | grep -v jest
   

4. Please, notice, that there are two directories assets and @assets in ../, each of them contains text.txt
5. Re-run yarn install:

   yarn install --force
   

6. Notice, that text.txt from ../@assets is purged:

   find .. | grep -v .git | grep -v jest