fix(headertest): sanity check range

[renaynay]

self explanatory

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 62.87%. Comparing base (06f57bb) to head (758f14d).
Report is 1 commits behind head on main.

Files	Patch %	Lines
headertest/store.go	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #166      +/-   ##
==========================================
- Coverage   62.88%   62.87%   -0.02%     
==========================================
  Files          39       39              
  Lines        3578     3577       -1     
==========================================
- Hits         2250     2249       -1     
  Misses       1155     1155              
  Partials      173      173              

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