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51 Adds database query count test expectation helper
This PR adds the database query count expectation helper that I used to catch N+1 issues in tests. In the video I showed how I can assert the query count for a page and then fix the code with eager loading or withCount to make the test pass.
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Pros
- +Makes N+1 and query regressions visible in tests
- +Encourages more performance-aware Laravel code
Cons
- -Tests can become brittle if query counts change for valid reasons
