Add source tblist functions tests

[syroBx]

• get_date_range_frequencies
• date range filter

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.33%. Comparing base (adc2786) to head (fbf77a4).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #83      +/-   ##
==========================================
+ Coverage   68.94%   72.33%   +3.38%     
==========================================
  Files          11       11              
  Lines        1977     1977              
==========================================
+ Hits         1363     1430      +67     
+ Misses        614      547      -67     

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