Move tests to TestItems

[Azzaare]

No description provided.

[codecov]

Codecov Report

Base: 94.55% // Head: 93.75% // Decreases project coverage by -0.81% ⚠️

Coverage data is based on head (1abd1e2) compared to base (3803fe2).
Patch coverage: 87.09% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #55      +/-   ##
==========================================
- Coverage   94.55%   93.75%   -0.81%     
==========================================
  Files          11       11              
  Lines         257      288      +31     
==========================================
+ Hits          243      270      +27     
- Misses         14       18       +4     

Impacted Files	Coverage Δ
src/CompositionalNetworks.jl	100.00% <ø> (ø)
src/composition.jl	100.00% <ø> (ø)
src/layers/aggregation.jl	100.00% <ø> (ø)
src/layers/arithmetic.jl	71.42% <0.00%> (ø)
src/utils.jl	97.50% <ø> (ø)
src/layers/transformation.jl	89.18% <50.00%> (ø)
src/layers/comparison.jl	100.00% <100.00%> (ø)

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