Tests for archive coordinate arrays

[carienmol]

Currently, the only way in which coordinatearrays are archived in birdwatcher, is by using the batch_detect_movement function, which uses the 'privat' _archive function (previously _f, but I changed the name). In _archive 2 darr functions are used to (1) archive the coordinatearrays with its own folder name and (2) the original darr array is removed.

• I've written a test for the _archive function to check these two functionalities (in case darr changes someday)
• I've changed the test for open_archivedcoordinatedata, which uses the _archive function now
• I've added a test for extract_archivedcoordinatedata

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.94%. Comparing base (7ce96d0) to head (556762f).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #13      +/-   ##
===========================================
+ Coverage    78.12%   78.94%   +0.81%     
===========================================
  Files           11       11              
  Lines          855      855              
===========================================
+ Hits           668      675       +7     
+ Misses         187      180       -7     

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