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?

• [x] pynorms
• [x] 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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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