Add unit test to cover max_count > 0 in _is_node_in_replacement_valid

[dreambeyondorange]

Description of changes

• Added unit tests to cover this new edge case

Tests

• Ran unit tests locally

References

• Link to impacted open issues.
• Link to related PRs in other packages (i.e. cookbook, node).
• Link to documentation useful to understand the changes.

Checklist

• Make sure you are pointing to the right branch.
• If you're creating a patch for a branch other than develop add the branch name as prefix in the PR title (e.g. [release-3.6]).
• Check all commits' messages are clear, describing what and why vs how.
• Make sure to have added unit tests or integration tests to cover the new/modified code.
• Check if documentation is impacted by this change.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.78%. Comparing base (ecaffb8) to head (3714a58).

Additional details and impacted files

@@             Coverage Diff              @@
##           release-3.9     #621   +/-   ##
============================================
  Coverage        90.78%   90.78%           
============================================
  Files               20       20           
  Lines             3137     3137           
============================================
  Hits              2848     2848           
  Misses             289      289           

Flag	Coverage Δ
unittests	90.78% <ø> (ø)

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