Added Dart Testing

[auroq]

Congrats on taking the first step to contributing to the Sample Programs repository maintained by The Renegade Coder! 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
  • I added fun facts (i.e. debut, developer, typing, etc.)
  • I added reference link(s) to the README
  • I added solution citations when necessary (see plagiarism)

Documentation

• I named the pull request using Added/Updated <Sample Program> in <Language> Article format
• I followed the applicable article template
  • I added/updated a language article (i.e. The Python Programming Language)
  • I added/updated a code snippet article (i.e. Hello World in Perl)
  • I added/updated a project article (i.e. Fizz Buzz in Every Language)

Testing

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

Notes

Feel free to describe what you added or updated.

[jrg94]

Exciting stuff! Nice work. 🔥