Test case for viewcfg GDB command

[Kazhuu]

Add more GDB test coverage.

[codecov]

Codecov Report

Merging #19 (6876982) into main (a284f06) will increase coverage by 3.60%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
+ Coverage   72.52%   76.12%   +3.60%     
==========================================
  Files           4        4              
  Lines         222      222              
==========================================
+ Hits          161      169       +8     
+ Misses         61       53       -8     

Impacted Files	Coverage Δ
src/asm2cfg/asm2cfg.py	82.60% <0.00%> (+2.48%)	⬆️
src/gdb_asm2cfg.py	78.26% <0.00%> (+8.69%)	⬆️

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