Now all modules are in core modules folder

modules/date/tests/README.txt

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+The tests here were written for an older version of simpletest and
+still need to be updated to work with the current version.
+
+This folder includes files that can be used to test imports of date information.
+To test them, set up FeedAPI and the Feed Element Mapper with Parser iCal
+or Parser CVS and import these files into a date field.
+
+- rrule.ics: 
+  Creates repeating dates using a wide variety of RRULEs.
+
+- Yahoo.csv: 
+  This file uses the csv export format from Yahoo Calendar, similar to the 
+  format created by Outlook's csv export. The sample contains both timed
+  and untimed 'All day' events.
+
+- USHolidays.ics:
+  An ical export of US Holidays in the 'All day' format used by
+  Microsoft and Apple (where the Start date is the date of the event
+  and the End date is the following day).