Optimize test_simd

[cydrain]

issue: #977
improve code coverage of "src/simd" from 57.3% to 67.2%

[mergify]

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[foxspy]

/lgtm

[sre-ci-robot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.92%. Comparing base (3c46f4c) to head (a0514a1).
Report is 324 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##           main    #1096       +/-   ##
=========================================
+ Coverage      0   72.92%   +72.92%     
=========================================
  Files         0       85       +85     
  Lines         0     8225     +8225     
=========================================
+ Hits          0     5998     +5998     
- Misses        0     2227     +2227     

see 85 files with indirect coverage changes

[alexanderguzhva]

/lgtm