Adding thorough testing (#38)

* Adding thorough testing

* Using pytest fixture

* Changing the pytest fixture names

* Activating the person test

* deleting age

* adding second dataset

* adding file and fiel boundle

* add seek to file open

* modifying text files

* fixing path prefix

* use tempfile

* using pathlib for abs path

* not cheking hash for windows

Author: Peyman-N