Added tests for Array2 type in ndarray signum impl

[stefan-k]

No description provided.

[codecov-commenter]

Codecov Report

Base: 92.11% // Head: 92.24% // Increases project coverage by +0.12% 🎉

Coverage data is based on head (45cabb2) compared to base (f06b60f).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #287      +/-   ##
==========================================
+ Coverage   92.11%   92.24%   +0.12%     
==========================================
  Files         119      119              
  Lines       17953    18004      +51     
==========================================
+ Hits        16537    16607      +70     
+ Misses       1416     1397      -19     

Impacted Files	Coverage Δ
argmin-math/src/ndarray_m/signum.rs	100.00% <100.00%> (+28.78%)	⬆️

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