Testing and Integration

In the previous lesson, you built an admin interface for managing library inventory. Now it's time to bring everything together by creating a comprehensive test suite that validates all the components of your Library Management System work correctly together.

You'll add a LibraryTester class that runs integration tests across all your library features - verifying that books, users, admins, borrowing, searching, and inventory management all function as expected when used together.

• book.dart, user.dart, admin.dart, library.dart: Keep your existing classes unchanged.
• library_tester.dart: Create a new LibraryTester class that validates your library system. It should have a Library instance and include these test methods:
  • setupTestData() - registers an admin (A001, Test Admin), adds two books via the admin (978-0-01, Book One, Author A and 978-0-02, Book Two, Author B), and registers a user (U001, Test User)
  • testBorrowing() - borrows the first book for the user, attempts to borrow it again (should fail), then returns it. Print Borrowing test: PASS after completion.
  • testSearch() - searches for books with Book in the title, prints Search found: X books where X is the count, then prints Search test: PASS
  • testAdminOperations() - removes the second book using the admin, prints the book count as Books after removal: X, then prints Admin test: PASS
  • runAllTests() - calls setupTestData(), then runs all three test methods in order, and finally prints All tests completed!
• main.dart: Create a LibraryTester instance and call runAllTests() to execute the full test suite.

Expected output:

A001 added "Book One"
A001 added "Book Two"
U001 borrowed "Book One"
Book not available
U001 returned "Book One"
Borrowing test: PASS
Search found: 2 books
Search test: PASS
A001 removed "Book Two"
Books after removal: 1
Admin test: PASS
All tests completed!