Added Sleep Sort Testing

[jrg94]

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For simplicity, please make sure that your pull request includes one and only one contribution.

Complete the Applicable Sections Below

Find which section best describes your pull request and make sure you fill it out. To start, let us know which issue you've fixed.

• I fixed #your-issue-number-here

Code Snippets

• I named the pull request using Added/Updated <Sample Program> in <Language> format
• I created/updated the language README
  • I added the sample program name to the README
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Testing

• I named the pull request using Added/Updated <Language>/<Project> Testing format
• I followed the testinfo template, if applicable

Notes

Once merged, this will allow us to reach the 25 project tests milestone.

[jrg94]

I know why Dart is broken, but I'm literally too inexperienced with the language to fix it. Apparently, the script only works with input in this form: 6 4 5. It needs to work with input in this form: 6, 4, 5.