simple tests, step1.

[atherdon]

Is your feature request related to a problem? Please describe.

at files.js we exporting paths to each(i can be wrong) file from our data folder.
but at index.test.js we testing only allergies.
our goal is to have tests for all files from files.js

also please read Readme file, read this task and introduce yourself to other team members here: #158

Is it was created as task at GitHub issues? Please provide an issue number or link

Describe the solution you'd like
A clear and concise description of what you want to happen.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.