Add Arrow DST tests based on two false positives

[systemcatch]

Pull Request Checklist

Thank you for taking the time to improve Arrow! Before submitting your pull request, please check all appropriate boxes:

• 🧪 Added tests for changed code.
• 🛠️ All tests pass when run locally (run tox or make test to find out!).
• 📚 Updated documentation for changed code.
• ⏩ Code is up-to-date with the master branch.

If you have any questions about your code changes or any of the points above, please submit your questions along with the pull request and we will try our best to help!

Description of Changes

Added comments explaining the new tests and referenced the correct issues.

Replaces #732
Closes #376
Closes #551

[codecov-io]

Codecov Report

Merging #747 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #747   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           9      9           
  Lines        1669   1669           
  Branches      282    282           
=====================================
  Hits         1669   1669

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[jadchaar]

LGTM