simple tests, step1.

**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: https://github.com/GroceriStar/sd/issues/158

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