Inline signature verifications test macros

[djc]

In service of:

• Add context to signature-related errors #357

[codecov]

Codecov Report

Attention: Patch coverage is 99.32203% with 2 lines in your changes missing coverage. Please review.

Project coverage is 97.99%. Comparing base (2aed5e1) to head (d552f20).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/alg_tests.rs	99.32%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #358      +/-   ##
==========================================
+ Coverage   97.91%   97.99%   +0.07%     
==========================================
  Files          20       20              
  Lines        4470     4729     +259     
==========================================
+ Hits         4377     4634     +257     
- Misses         93       95       +2     

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