🧑‍💻 Add testing plugin

[aleksul]

Change Summary

• Small refactoring of optional import function
• Pytest testing plugin
• Unit tests

Related issue number

fix #106

Checklist

• [x] Unit tests for the changes exist
• [x] Tests pass on CI and coverage remains at 100%
• [x] Documentation reflects the changes where applicable
• [x] My PR is ready to review

[codecov[bot]]

Codecov Report

Merging #111 (bafd963) into main (71283c2) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              main      #111    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           44        47     +3     
  Lines         1701      1846   +145     
==========================================
+ Hits          1701      1846   +145     

Impacted Files	Coverage Δ
repid/__init__.py	100.00% <100.00%> (ø)
repid/connections/__init__.py	100.00% <100.00%> (ø)
repid/data/_parameters.py	100.00% <100.00%> (ø)
repid/serializer.py	100.00% <100.00%> (ø)
repid/testing/__init__.py	100.00% <100.00%> (ø)
repid/testing/modifiers.py	100.00% <100.00%> (ø)
repid/testing/plugin.py	100.00% <100.00%> (ø)
repid/utils.py	100.00% <100.00%> (ø)

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