def reset_calendars():
"""
This function, used only for testing purposes, resets the calendars list to
its initial states.
:return: a simple status
"""
# Removing all calendars and dates:
with orm.db_session:
# Deleting all dates and calendars
Date.select().delete(bulk=True)
Calendar.select().delete(bulk=True)
# Creating sample calendars and dates
Calendar(id=0, title="Empty calendar")
c2 = Calendar(id=1, title="Sport and activities")
Date(id=0, calendar=c2, date="2018-01-01", event="Go fishing")
Date(id=1, calendar=c2, date="2018-01-11", event="Go surfing")
Date(id=2, calendar=c2, date="2018-02-12", event="Go skying")
Date(id=3, calendar=c2, date="2018-03-09", event="Go swimming")
return dict(status="done")
