[#55] Update testsuite

[matthiasgomolka]

See #55.

[codecov]

Codecov Report

Attention: Patch coverage is 21.27660% with 74 lines in your changes are missing coverage. Please review.

Project coverage is 48.44%. Comparing base (ccbc87f) to head (47fa546).

❗ Current head 47fa546 differs from pull request most recent head 7245d62. Consider uploading reports for the commit 7245d62 to get more accurate results

Files	Patch %	Lines
R/check_inputs.R	17.94%	64 Missing ⚠️
R/sfa_load__shares_outstanding.R	0.00%	7 Missing ⚠️
R/zzz.R	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #60       +/-   ##
===========================================
+ Coverage   20.44%   48.44%   +28.00%     
===========================================
  Files          10       10               
  Lines         318      322        +4     
===========================================
+ Hits           65      156       +91     
+ Misses        253      166       -87     

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