Fix a misleading test.

[tdilauro]

Description

Fixes a test that only appeared to be working.

Motivation and Context

While working on PP-1875, I noticed this test, which happened to be passing only because the associated library had only a single collection.

How Has This Been Tested?

• Updated the test and added more test cases.
• Tests pass locally.
• CI tests for associated branch pass.

Checklist

• I have updated the documentation accordingly.
• All new and existing tests passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.11%. Comparing base (ec00a8e) to head (a9b1e04).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2215      +/-   ##
==========================================
+ Coverage   91.09%   91.11%   +0.02%     
==========================================
  Files         363      363              
  Lines       41201    41274      +73     
  Branches     8827     8837      +10     
==========================================
+ Hits        37531    37606      +75     
  Misses       2406     2406              
+ Partials     1264     1262       -2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.