Add tests for additions in #1426

[BinaryInk]

Self-explanatory; added three assertions to test for values for the properties urgency, stack_tag, and urls are being outputted via dunstctl history

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.32%. Comparing base (8010c7e) to head (7789fbc).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1431      +/-   ##
==========================================
+ Coverage   65.21%   65.32%   +0.10%     
==========================================
  Files          50       50              
  Lines        8737     8763      +26     
  Branches     1034     1034              
==========================================
+ Hits         5698     5724      +26     
  Misses       3039     3039              

Flag	Coverage Δ
unittests	65.32% <100.00%> (+0.10%)	⬆️

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[bynect]

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