asl-say: Add tests

[mkmer]

Summary by CodeRabbit

Release Notes

• Bug Fixes

  • Improved command-line argument validation with clearer error messages for missing or invalid inputs
  • Enhanced numeric parameter validation with specific error feedback

• Tests

  • Added comprehensive test suite covering argument validation, error handling, and output verification across multiple operational modes

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch asl-say-tests

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[mkmer]

The asl-say did not show usage if 0 args were provided (as I think it should have). Also confirm that the -n <NODE> is all numeric.

These "showed" themselves as I worked through the tests.