Add multi edge tests for femap

[jthorton]

Description

Provide a brief description of the PR's purpose here.
Follow up from #211 adds tests for the FEMap for bidirectional and multi defined edges.

Todos

Notable points that this PR has either accomplished or will accomplish.

• TODO 1

Questions

• Question1

LLM / AI generated code disclosure

LLMs or other AI-powered tools (beyond simple IDE use cases) were used in this contribution: yes / no
If yes, please provide details here: No

Checklist

• Added a news entry for new features, bug fixes, or other user facing changes.
• Filled in the AI-generated code disclosure.

Status

• Ready to go

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.58%. Comparing base (0edd997) to head (c6e0186).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #233      +/-   ##
==========================================
+ Coverage   97.56%   97.58%   +0.01%     
==========================================
  Files          24       24              
  Lines        2630     2645      +15     
==========================================
+ Hits         2566     2581      +15     
  Misses         64       64              

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[jthorton]

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