Add additional tests for option.c

[yegappan]

No description provided.

[codecov]

Codecov Report

Merging #8369 (750609b) into master (8de901e) will increase coverage by 0.67%.
The diff coverage is n/a.

❗ Current head 750609b differs from pull request most recent head 61160f7. Consider uploading reports for the commit 61160f7 to get more accurate results

@@            Coverage Diff             @@
##           master    #8369      +/-   ##
==========================================
+ Coverage   88.98%   89.65%   +0.67%     
==========================================
  Files         148      149       +1     
  Lines      166452   164525    -1927     
==========================================
- Hits       148121   147510     -611     
+ Misses      18331    17015    -1316     

Flag	Coverage Δ
huge-clang-none	91.79% <ø> (+2.80%)	⬆️
huge-gcc-none	89.25% <ø> (?)
huge-gcc-testgui	87.74% <ø> (+<0.01%)	⬆️
huge-gcc-unittests	2.50% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/libvterm/src/unicode.c	70.83% <0.00%> (-17.17%)	⬇️
src/os_unix.c	70.98% <0.00%> (-0.97%)	⬇️
src/textobject.c	91.69% <0.00%> (-0.71%)	⬇️
src/if_python.c	82.65% <0.00%> (-0.62%)	⬇️
src/bufwrite.c	84.17% <0.00%> (-0.60%)	⬇️
src/drawline.c	84.74% <0.00%> (-0.55%)	⬇️
src/move.c	93.77% <0.00%> (-0.54%)	⬇️
src/ex_cmds2.c	90.93% <0.00%> (-0.54%)	⬇️
src/beval.c	82.81% <0.00%> (-0.53%)	⬇️
src/mbyte.c	80.09% <0.00%> (-0.52%)	⬇️
... and 116 more

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