increase map test coverage

[jlc-christie]

Please provide a brief description of the change.

Due to a change in how pull iterators are implemented, coverage dropped on these tests.

Which issue does this change relate to?

This just includes coverage for map.

Contribution checklist.

Replace the space in each box with "X" to check it off.

• [X] I have read and understood the CONTRIBUTING guidelines
• [X] My code is formatted (make check)
• [X] I have run tests (make test)
• [X] All commits in my PR conform to the commit hygiene section
• [X] I have added relevant tests
• [X] I have not added any dependencies

Additional context

N/A

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.27%. Comparing base (b35ab35) to head (030474a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## v2 #121 +/- ## ========================================== + Coverage 95.03% 96.27% +1.24% ========================================== Files 16 16 Lines 322 322 ========================================== + Hits 306 310 +4 + Misses 8 6 -2 + Partials 8 6 -2 ```

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