Update TestCollectionSearchLibraryFilter to check for specific test
books rather than exact counts, making tests resilient to changing
dev database data.
Changes:
- Modified "no filter" test case to check both test books are present
- Enhanced shouldContain to support comma-separated book ID lists
- Added strings import for ID list processing
- Skip exact count check when expectedCount is 0
Rationale:
The library_id filter was working correctly. The test failure was due
to running against a dev database with pre-existing data. When no
library_id filter is provided, the API correctly returns all visible
books across all libraries, not just test-created books.
This validates that the filter works correctly while being resilient
to dynamic dev database content.
Fixes: #test-isolation-library-filter
john-okeefe
0298c589b1