Add comprehensive tests for books functionality #71
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Summary
Addresses #14 - "This ain't got no tests!"
This PR adds comprehensive test coverage for the books functionality, which was previously untested.
New Tests Added (8 tests)
Resolver Structure
books,book,addBook)Query Tests
booksquery returns an arraybooksquery returns books with correct structure (id, title, author)book(id)query returns a single book by IDbook(id)query returns null for non-existent IDMutation Tests
addBookmutation creates a new book with correct databook(id)queryTest Results
Test Plan
Closes #14