Improve code coverage

[odow]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 53.33333% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 95.68%. Comparing base (f03d0a7) to head (b15d16c).

Files	Patch %	Lines
src/C_API.jl	53.33%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #103      +/-   ##
==========================================
+ Coverage   94.60%   95.68%   +1.08%     
==========================================
  Files           3        3              
  Lines         463      464       +1     
==========================================
+ Hits          438      444       +6     
+ Misses         25       20       -5     

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