Add more tests

[sidml]

• Add Tests On Graphs #54
• Add Tests on Edge Class #56

Adding new tests to improve code coverage.

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[codecov-commenter]

Codecov Report

Merging #85 (79508bf) into master (0b18ac2) will increase coverage by 0.74%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #85      +/-   ##
==========================================
+ Coverage   94.65%   95.39%   +0.74%     
==========================================
  Files          35       35              
  Lines        3349     3413      +64     
==========================================
+ Hits         3170     3256      +86     
+ Misses        179      157      -22     

Flag	Coverage Δ
unittests	95.39% <100.00%> (+0.74%)	⬆️

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Impacted Files	Coverage Δ
test/BellmanFordTest.cpp	100.00% <ø> (ø)
test/EdgeTest.cpp	100.00% <100.00%> (ø)
test/RWOutputTest.cpp	98.89% <100.00%> (+0.02%)	⬆️
include/Graph/Graph.hpp	97.52% <0.00%> (+3.20%)	⬆️

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[sidml]

@ZigRazor
Coverage for Graph.hpp functionalities looks good. RWOutputTest.cpp can be improved further especially the cases where file can't be read or written. I thought TEST(RWOutputTest, test_28) would be enough, but looks like more work is needed.
Please feel free to modify it. If this PR is acceptable then please merge it.

[ZigRazor]

RWOutputTest.cpp can be improved further especially the cases where file can't be read or written

Yes, if you want you can improve it.