The following are the list of tests used to write the cal_ruby methods:
- return_the_headers
- month_out_of_range
- year_out_of_range
- what_month_is_it_longName_September
- how_many_spaces_are_needed_before_the_month_in_the_header
- display_header_and_days_of_the_week
- return_day_of_the_week
- total_days_in_the_month
- write_all_days_month
- compare_whole_month (between original cal and cal_ruby)