TST: Ramp diagnostic

[braingram]

Resolves JP-nnnn Resolves RCAL-nnnn

Closes #

This PR addresses ...

Checklist

• [ ] added entry in CHANGES.rst (either in Bug Fixes or Changes to API)
• [ ] updated relevant tests
• [ ] updated relevant documentation
• [ ] updated relevant milestone(s)
• [ ] added relevant label(s)

[codecov[bot]]

Codecov Report

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

Project coverage is 10.67%. Comparing base (af5aefb) to head (23e2896). Report is 5 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #257 +/- ## =========================================== - Coverage 85.18% 10.67% -74.51% =========================================== Files 35 32 -3 Lines 6797 6847 +50 =========================================== - Hits 5790 731 -5059 - Misses 1007 6116 +5109 ```

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