Improve and fix ResultType tests

[chapulina]

🦟 Bug fix

Summary

While debugging test failures on #224, I noticed that some of our ResultType tests were comparing Result objects converted to booleans instead of the result types themselves. This PR makes sure we're comparing the types and fixes some test expectations.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

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[codecov]

Codecov Report

Merging #225 (ba7cf87) into ign-fuel-tools4 (4edeed5) will not change coverage.
The diff coverage is n/a.

@@               Coverage Diff                @@
##           ign-fuel-tools4     #225   +/-   ##
================================================
  Coverage            77.90%   77.90%           
================================================
  Files                   19       19           
  Lines                 2715     2715           
================================================
  Hits                  2115     2115           
  Misses                 600      600           

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