Add unittest dijkstra

[tuanhuy23]

Add more unit test for algorithms dijktra

[siriak]

Why do you need Algorithms.Dijktra.Tests/Algorithms.Dijktra.Tests.csproj? All tests are put either in Algorithms.Tests or DataStructures.Tests

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 2.80%. Comparing base (2ed7a7b) to head (0f2a55c).

Files with missing lines	Patch %	Lines
Algorithms/Graph/Dijkstra/DistanceModel.cs	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #504       +/-   ##
==========================================
- Coverage   95.16%   2.80%   -92.36%     
==========================================
  Files         267     267               
  Lines       10848   10857        +9     
  Branches     1527    1527               
==========================================
- Hits        10323     305    -10018     
- Misses        400   10543    +10143     
+ Partials      125       9      -116     

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