More checks when manipulating file system in tests

[chapulina]

🎉 New feature

Summary

These checks are useful when debugging test failures. At a minimum, they allow us to rule-out these lines are reasons for the failure.

The changes consist in expecting true for these calls:

• createDirectories
• copyFile

This is motivated by debugging #224

Test it

CI should pass for all platforms

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• 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 #227 (b6ba285) into ign-fuel-tools4 (3ea0844) will not change coverage.
The diff coverage is n/a.

❗ Current head b6ba285 differs from pull request most recent head a40d439. Consider uploading reports for the commit a40d439 to get more accurate results

@@               Coverage Diff                @@
##           ign-fuel-tools4     #227   +/-   ##
================================================
  Coverage            77.90%   77.90%           
================================================
  Files                   19       19           
  Lines                 2715     2715           
================================================
  Hits                  2115     2115           
  Misses                 600      600           

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