bug(orderedmap,test): fixed sub-optimal error reporting in real_main_test

[fgm]

Fixes #32

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.67%. Comparing base (aedcf68) to head (da57354).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #33   +/-   ##
=======================================
  Coverage   98.67%   98.67%           
=======================================
  Files          13       13           
  Lines         302      302           
=======================================
  Hits          298      298           
  Misses          4        4           

Flag	Coverage Δ
unittests	98.67% <ø> (ø)

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