fix: remove deprecated test functions

[mike-r-harris]

Resolves #NUMBER

Description: Upgraded Commander from v5 to v7 Updated deprecated test functions

Type of change:

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Why is this change required?: Keeping changes up to date with latest testing lib versions

Code changes:

• Updated args.js to ensure Commander returns the correct config
• Replaced .equal( with .strictEqual(
• Replaced .notEqual( with .notStrictEqual(
• Replaced .deepEqual( with .deepStrictEqual(

---

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.