REFACTOR: use use small snp for test

[hui-zhou-a]

Description

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Issue linked

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Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
• I have agreed with the Contributor License Agreement (CLA).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.94%. Comparing base (4be184c) to head (7cf1b1d).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6596      +/-   ##
==========================================
+ Coverage   76.41%   81.94%   +5.53%     
==========================================
  Files         242      242              
  Lines       75961    75961              
==========================================
+ Hits        58042    62245    +4203     
+ Misses      17919    13716    -4203     

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[Samuelopez-ansys]

Where are these files used?

[hui-zhou-a]

@Samuelopez-ansys

test_01_get_touchstone_data
test_get_coupling_in_range