Add a test to executable class

[aerorahul]

Description
Add a test to demonstrate the use of arguments passed to an executable are not default args.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• pynorms
• pytests

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes need updates to the documentation. I have made corresponding changes to the documentation
• My changes generate no new warnings
• New and existing tests pass with my changes
• Any dependent changes have been merged and published

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.06%. Comparing base (d314e06) to head (439ce37).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #38      +/-   ##
===========================================
+ Coverage    49.93%   50.06%   +0.12%     
===========================================
  Files           18       18              
  Lines         1650     1650              
  Branches       337      337              
===========================================
+ Hits           824      826       +2     
  Misses         765      765              
+ Partials        61       59       -2     

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