test(smc): add unit tests for SMC-R networking functionality

[l1b0k]

• Implement comprehensive unit tests for SMC-R networking features
• Cover various scenarios including success and failure cases
• Mock system commands and file operations for isolated testing
• Use testify/assert for test assertions
• Include tests for ensuring SMC-R support, configuring devices, and handling errors

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.75%. Comparing base (c146cfb) to head (7f78358).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #891      +/-   ##
==========================================
+ Coverage   53.48%   53.75%   +0.27%     
==========================================
  Files         132      132              
  Lines       19523    19523              
==========================================
+ Hits        10441    10495      +54     
+ Misses       8024     7970      -54     
  Partials     1058     1058              

Flag	Coverage Δ
unittests	53.75% <ø> (+0.27%)	⬆️

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