refactor: create separate BLoCs for each screen with comprehensive tests

- Created 8 separate BLoCs (Home, Library, BookDetails, AddBook, Scanner, Categories, Wishlist, Settings)
- Each BLoC has its own event, state, and bloc files
- Added 70 comprehensive tests covering all BLoC functionality
- All tests passing (70/70)
- Fixed linting issues and updated deprecated APIs
- Improved code organization and maintainability

bookshelf_flutter/test/bloc/add_book/add_book_bloc_test.dart

@@ -0,0 +1,178 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:bookshelf_flutter/bloc/add_book/add_book_bloc.dart';
+import 'package:bookshelf_flutter/bloc/add_book/add_book_event.dart';
+import 'package:bookshelf_flutter/bloc/add_book/add_book_state.dart';
+import 'package:bookshelf_flutter/models/models.dart';
+
+void main() {
+  group('AddBookBloc', () {
+    late AddBookBloc addBookBloc;
+
+    setUp(() {
+      addBookBloc = AddBookBloc();
+    });
+
+    tearDown(() {
+      addBookBloc.close();
+    });
+
+    test('initial state is AddBookState.initial()', () {
+      expect(addBookBloc.state, isA<AddBookState>());
+      expect(addBookBloc.state.isLoading, false);
+    });
+
+    group('InitializeForm', () {
+      test('initializes form with prefilled data', () async {
+        final prefilledData = {
+          'title': 'Test Book',
+          'author': 'Test Author',
+          'genre': 'Test Genre',
+          'annotation': 'Test annotation',
+          'coverUrl': 'https://example.com/cover.jpg',
+          'pages': 200,
+          'language': 'English',
+          'publishedYear': 2020,
+          'rating': 4.5,
+          'status': BookStatus.reading,
+          'progress': 50,
+          'isFavorite': true,
+        };
+
+        addBookBloc.add(InitializeForm(prefilledData));
+        await Future.delayed(Duration.zero);
+
+        expect(addBookBloc.state.title, 'Test Book');
+        expect(addBookBloc.state.author, 'Test Author');
+        expect(addBookBloc.state.genre, 'Test Genre');
+        expect(addBookBloc.state.isFavorite, true);
+        expect(addBookBloc.state.pages, 200);
+      });
+
+      test('initializes form with empty data when prefilledData is null', () async {
+        addBookBloc.add(const InitializeForm(null));
+        await Future.delayed(Duration.zero);
+
+        expect(addBookBloc.state.title, '');
+        expect(addBookBloc.state.author, '');
+        expect(addBookBloc.state.isFavorite, false);
+      });
+    });
+
+    group('UpdateFormField', () {
+      test('updates title field', () async {
+        addBookBloc.add(const UpdateFormField('title', 'New Title'));
+        await Future.delayed(Duration.zero);
+
+        expect(addBookBloc.state.title, 'New Title');
+      });
+
+      test('updates author field', () async {
+        addBookBloc.add(const UpdateFormField('author', 'New Author'));
+        await Future.delayed(Duration.zero);
+
+        expect(addBookBloc.state.author, 'New Author');
+      });
+
+      test('updates genre field', () async {
+        addBookBloc.add(const UpdateFormField('genre', 'New Genre'));
+        await Future.delayed(Duration.zero);
+
+        expect(addBookBloc.state.genre, 'New Genre');
+      });
+
+      test('updates pages field', () async {
+        addBookBloc.add(const UpdateFormField('pages', 300));
+        await Future.delayed(Duration.zero);
+
+        expect(addBookBloc.state.pages, 300);
+      });
+
+      test('updates rating field', () async {
+        addBookBloc.add(const UpdateFormField('rating', 4.8));
+        await Future.delayed(Duration.zero);
+
+        expect(addBookBloc.state.rating, 4.8);
+      });
+
+      test('updates status field', () async {
+        addBookBloc.add(const UpdateFormField('status', BookStatus.done));
+        await Future.delayed(Duration.zero);
+
+        expect(addBookBloc.state.status, BookStatus.done);
+      });
+    });
+
+    group('ToggleFavorite', () {
+      test('toggles isFavorite from false to true', () async {
+        expect(addBookBloc.state.isFavorite, false);
+
+        addBookBloc.add(const ToggleFavorite());
+        await Future.delayed(Duration.zero);
+
+        expect(addBookBloc.state.isFavorite, true);
+      });
+
+      test('toggles isFavorite from true to false', () async {
+        addBookBloc.add(const ToggleFavorite());
+        await Future.delayed(Duration.zero);
+        expect(addBookBloc.state.isFavorite, true);
+
+        addBookBloc.add(const ToggleFavorite());
+        await Future.delayed(Duration.zero);
+
+        expect(addBookBloc.state.isFavorite, false);
+      });
+    });
+
+    group('ClearForm', () {
+      test('clears all form fields', () async {
+        addBookBloc.add(const UpdateFormField('title', 'Test'));
+        addBookBloc.add(const UpdateFormField('author', 'Test'));
+        addBookBloc.add(const ToggleFavorite());
+        await Future.delayed(Duration.zero);
+
+        expect(addBookBloc.state.title, 'Test');
+
+        addBookBloc.add(const ClearForm());
+        await Future.delayed(Duration.zero);
+
+        expect(addBookBloc.state.title, '');
+        expect(addBookBloc.state.author, '');
+        expect(addBookBloc.state.isFavorite, false);
+      });
+    });
+
+    group('SubmitBook', () {
+      test('creates book with form data and sets isSubmitted to true', () async {
+        addBookBloc.add(const UpdateFormField('title', 'New Book'));
+        addBookBloc.add(const UpdateFormField('author', 'New Author'));
+        addBookBloc.add(const UpdateFormField('genre', 'New Genre'));
+        addBookBloc.add(const UpdateFormField('annotation', 'New annotation'));
+        addBookBloc.add(const UpdateFormField('pages', 200));
+        addBookBloc.add(const UpdateFormField('language', 'English'));
+        addBookBloc.add(const UpdateFormField('publishedYear', 2023));
+        addBookBloc.add(const UpdateFormField('rating', 4.5));
+        addBookBloc.add(const UpdateFormField('status', BookStatus.wantToRead));
+        addBookBloc.add(const UpdateFormField('progress', 0));
+        await Future.delayed(Duration.zero);
+
+        addBookBloc.add(const SubmitBook());
+        await Future.delayed(Duration.zero);
+
+        expect(addBookBloc.state.isSubmitted, true);
+        expect(addBookBloc.state.submittedBook?.title, 'New Book');
+        expect(addBookBloc.state.submittedBook?.author, 'New Author');
+      });
+
+      test('uses default values for empty fields', () async {
+        addBookBloc.add(const SubmitBook());
+        await Future.delayed(Duration.zero);
+
+        expect(addBookBloc.state.submittedBook?.title, 'Unknown');
+        expect(addBookBloc.state.submittedBook?.author, 'Unknown');
+        expect(addBookBloc.state.submittedBook?.genre, 'Unknown');
+        expect(addBookBloc.state.submittedBook?.coverUrl?.isNotEmpty, true);
+      });
+    });
+  });
+}

bookshelf_flutter/test/bloc/book_details/book_details_bloc_test.dart

@@ -0,0 +1,138 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:bookshelf_flutter/bloc/book_details/book_details_bloc.dart';
+import 'package:bookshelf_flutter/bloc/book_details/book_details_event.dart';
+import 'package:bookshelf_flutter/bloc/book_details/book_details_state.dart';
+import 'package:bookshelf_flutter/models/models.dart';
+
+void main() {
+  group('BookDetailsBloc', () {
+    late BookDetailsBloc bookDetailsBloc;
+    late Book testBook;
+
+    setUp(() {
+      bookDetailsBloc = BookDetailsBloc();
+      testBook = createBook(
+        id: '1',
+        title: 'Test Book',
+        author: 'Test Author',
+        genre: 'Test Genre',
+        annotation: 'Test annotation',
+        coverUrl: 'https://example.com/cover.jpg',
+        pages: 200,
+        language: 'English',
+        publishedYear: 2020,
+        rating: 4.5,
+        status: BookStatus.reading,
+        progress: 50,
+        isFavorite: false,
+      );
+    });
+
+    tearDown(() {
+      bookDetailsBloc.close();
+    });
+
+    test('initial state is BookDetailsState.initial()', () {
+      expect(bookDetailsBloc.state, isA<BookDetailsState>());
+      expect(bookDetailsBloc.state.isLoading, true);
+    });
+
+    group('LoadBookDetails', () {
+      test('loads book details into state', () async {
+        bookDetailsBloc.add(LoadBookDetails(testBook));
+        await Future.delayed(Duration.zero);
+
+        expect(bookDetailsBloc.state.book?.id, testBook.id);
+        expect(bookDetailsBloc.state.book?.title, testBook.title);
+        expect(bookDetailsBloc.state.isLoading, false);
+      });
+    });
+
+    group('ToggleFavorite', () {
+      test('toggles isFavorite from false to true', () async {
+        bookDetailsBloc.add(LoadBookDetails(testBook));
+        await Future.delayed(Duration.zero);
+
+        bookDetailsBloc.add(const ToggleFavorite());
+        await Future.delayed(Duration.zero);
+
+        expect(bookDetailsBloc.state.book?.isFavorite, true);
+      });
+
+      test('toggles isFavorite from true to false', () async {
+        final favoriteBook = testBook.copyWith(isFavorite: true);
+        bookDetailsBloc.add(LoadBookDetails(favoriteBook));
+        await Future.delayed(Duration.zero);
+
+        bookDetailsBloc.add(const ToggleFavorite());
+        await Future.delayed(Duration.zero);
+
+        expect(bookDetailsBloc.state.book?.isFavorite, false);
+      });
+
+      test('does nothing when no book is loaded', () async {
+        final initialFavorite = bookDetailsBloc.state.book?.isFavorite;
+        bookDetailsBloc.add(const ToggleFavorite());
+        await Future.delayed(Duration.zero);
+
+        expect(bookDetailsBloc.state.book?.isFavorite, initialFavorite);
+      });
+    });
+
+    group('UpdateProgress', () {
+      test('updates progress and keeps reading status', () async {
+        bookDetailsBloc.add(LoadBookDetails(testBook));
+        await Future.delayed(Duration.zero);
+
+        bookDetailsBloc.add(const UpdateProgress(75));
+        await Future.delayed(Duration.zero);
+
+        expect(bookDetailsBloc.state.book?.progress, 75);
+        expect(bookDetailsBloc.state.book?.status, BookStatus.reading);
+      });
+
+      test('updates status to done when progress is 100', () async {
+        bookDetailsBloc.add(LoadBookDetails(testBook));
+        await Future.delayed(Duration.zero);
+
+        bookDetailsBloc.add(const UpdateProgress(100));
+        await Future.delayed(Duration.zero);
+
+        expect(bookDetailsBloc.state.book?.progress, 100);
+        expect(bookDetailsBloc.state.book?.status, BookStatus.done);
+      });
+
+      test('does nothing when no book is loaded', () async {
+        final initialProgress = bookDetailsBloc.state.book?.progress;
+        bookDetailsBloc.add(const UpdateProgress(50));
+        await Future.delayed(Duration.zero);
+
+        expect(bookDetailsBloc.state.book?.progress, initialProgress);
+      });
+    });
+
+    group('UpdateStatus', () {
+      test('updates book status', () async {
+        bookDetailsBloc.add(LoadBookDetails(testBook));
+        await Future.delayed(Duration.zero);
+
+        bookDetailsBloc.add(const UpdateStatus(BookStatus.done));
+        await Future.delayed(Duration.zero);
+
+        expect(bookDetailsBloc.state.book?.status, BookStatus.done);
+      });
+    });
+
+    group('DeleteBook', () {
+      test('sets isDeleted to true', () async {
+        bookDetailsBloc.add(LoadBookDetails(testBook));
+        await Future.delayed(Duration.zero);
+
+        bookDetailsBloc.add(const DeleteBook());
+        await Future.delayed(Duration.zero);
+
+        expect(bookDetailsBloc.state.isDeleted, true);
+      });
+    });
+  });
+}

bookshelf_flutter/test/bloc/categories/categories_bloc_test.dart

@@ -0,0 +1,81 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:bookshelf_flutter/bloc/categories/categories_bloc.dart';
+import 'package:bookshelf_flutter/bloc/categories/categories_event.dart';
+import 'package:bookshelf_flutter/bloc/categories/categories_state.dart';
+
+void main() {
+  group('CategoriesBloc', () {
+    late CategoriesBloc categoriesBloc;
+
+    setUp(() {
+      categoriesBloc = CategoriesBloc();
+    });
+
+    tearDown(() {
+      categoriesBloc.close();
+    });
+
+    test('initial state is CategoriesState.initial()', () {
+      expect(categoriesBloc.state, isA<CategoriesState>());
+      expect(categoriesBloc.state.isLoading, true);
+    });
+
+    group('LoadCategories', () {
+      test('loads categories into state', () async {
+        categoriesBloc.add(const LoadCategories());
+        await Future.delayed(Duration.zero);
+
+        expect(categoriesBloc.state.categories.length, 8);
+        expect(categoriesBloc.state.filteredCategories.length, 8);
+        expect(categoriesBloc.state.isLoading, false);
+      });
+    });
+
+    group('SelectCategory', () {
+      test('updates selectedCategory in state', () async {
+        categoriesBloc.add(const LoadCategories());
+        await Future.delayed(Duration.zero);
+
+        final category = categoriesBloc.state.categories.first;
+        categoriesBloc.add(SelectCategory(category));
+        await Future.delayed(Duration.zero);
+
+        expect(categoriesBloc.state.selectedCategory?.id, category.id);
+      });
+    });
+
+    group('SearchCategories', () {
+      test('filters categories by name', () async {
+        categoriesBloc.add(const LoadCategories());
+        await Future.delayed(Duration.zero);
+
+        categoriesBloc.add(const SearchCategories('Sci'));
+        await Future.delayed(Duration.zero);
+
+        expect(categoriesBloc.state.filteredCategories.length, 1);
+        expect(categoriesBloc.state.filteredCategories.first.name.toLowerCase(), contains('sci'));
+      });
+
+      test('returns empty list when no matches found', () async {
+        categoriesBloc.add(const LoadCategories());
+        await Future.delayed(Duration.zero);
+
+        categoriesBloc.add(const SearchCategories('NonExistent'));
+        await Future.delayed(Duration.zero);
+
+        expect(categoriesBloc.state.filteredCategories.length, 0);
+      });
+
+      test('search is case insensitive', () async {
+        categoriesBloc.add(const LoadCategories());
+        await Future.delayed(Duration.zero);
+
+        categoriesBloc.add(const SearchCategories('classic'));
+        await Future.delayed(Duration.zero);
+
+        expect(categoriesBloc.state.filteredCategories.length, 1);
+        expect(categoriesBloc.state.filteredCategories.first.name, 'Classic');
+      });
+    });
+  });
+}

bookshelf_flutter/test/bloc/home/home_bloc_test.dart

@@ -0,0 +1,85 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:bookshelf_flutter/bloc/home/home_bloc.dart';
+import 'package:bookshelf_flutter/bloc/home/home_event.dart';
+import 'package:bookshelf_flutter/bloc/home/home_state.dart';
+import 'package:bookshelf_flutter/models/models.dart';
+
+void main() {
+  group('HomeBloc', () {
+    late HomeBloc homeBloc;
+
+    setUp(() {
+      homeBloc = HomeBloc();
+    });
+
+    tearDown(() {
+      homeBloc.close();
+    });
+
+    test('initial state is HomeState.initial()', () {
+      expect(homeBloc.state, isA<HomeState>());
+      expect(homeBloc.state.isLoading, true);
+    });
+
+    group('LoadHomeData', () {
+      test('loads home data with default screen', () async {
+        homeBloc.add(const LoadHomeData());
+        await Future.delayed(Duration.zero);
+
+        expect(homeBloc.state.currentScreen, AppScreen.library);
+        expect(homeBloc.state.isLoading, false);
+      });
+    });
+
+    group('NavigateToScreen', () {
+      test('navigates to library screen', () async {
+        homeBloc.add(const NavigateToScreen(AppScreen.library));
+        await Future.delayed(Duration.zero);
+
+        expect(homeBloc.state.currentScreen, AppScreen.library);
+      });
+
+      test('navigates to categories screen', () async {
+        homeBloc.add(const NavigateToScreen(AppScreen.categories));
+        await Future.delayed(Duration.zero);
+
+        expect(homeBloc.state.currentScreen, AppScreen.categories);
+      });
+
+      test('navigates to wishlist screen', () async {
+        homeBloc.add(const NavigateToScreen(AppScreen.wishlist));
+        await Future.delayed(Duration.zero);
+
+        expect(homeBloc.state.currentScreen, AppScreen.wishlist);
+      });
+
+      test('navigates to settings screen', () async {
+        homeBloc.add(const NavigateToScreen(AppScreen.settings));
+        await Future.delayed(Duration.zero);
+
+        expect(homeBloc.state.currentScreen, AppScreen.settings);
+      });
+
+      test('navigates to details screen', () async {
+        homeBloc.add(const NavigateToScreen(AppScreen.details));
+        await Future.delayed(Duration.zero);
+
+        expect(homeBloc.state.currentScreen, AppScreen.details);
+      });
+
+      test('navigates to add book screen', () async {
+        homeBloc.add(const NavigateToScreen(AppScreen.addBook));
+        await Future.delayed(Duration.zero);
+
+        expect(homeBloc.state.currentScreen, AppScreen.addBook);
+      });
+
+      test('navigates to scanner screen', () async {
+        homeBloc.add(const NavigateToScreen(AppScreen.scanner));
+        await Future.delayed(Duration.zero);
+
+        expect(homeBloc.state.currentScreen, AppScreen.scanner);
+      });
+    });
+  });
+}

bookshelf_flutter/test/bloc/library/library_bloc_test.dart

@@ -0,0 +1,124 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:bookshelf_flutter/bloc/library/library_bloc.dart';
+import 'package:bookshelf_flutter/bloc/library/library_event.dart';
+import 'package:bookshelf_flutter/bloc/library/library_state.dart';
+import 'package:bookshelf_flutter/models/models.dart';
+
+void main() {
+  group('LibraryBloc', () {
+    late LibraryBloc libraryBloc;
+
+    setUp(() {
+      libraryBloc = LibraryBloc();
+    });
+
+    tearDown(() {
+      libraryBloc.close();
+    });
+
+    test('initial state is LibraryState.initial()', () {
+      expect(libraryBloc.state, isA<LibraryState>());
+      expect(libraryBloc.state.isLoading, true);
+    });
+
+    group('LoadBooks', () {
+      test('emits [LibraryState] with books when LoadBooks is added', () async {
+        final expected = [
+          isA<LibraryState>()
+              .having((state) => state.isLoading, 'isLoading', false)
+              .having((state) => state.books.isNotEmpty, 'books.isNotEmpty', true),
+        ];
+
+        expectLater(libraryBloc.stream, emitsInOrder(expected));
+
+        libraryBloc.add(const LoadBooks());
+      });
+    });
+
+    group('SearchBooks', () {
+      test('filters books by title', () async {
+        libraryBloc.add(const LoadBooks());
+        await Future.delayed(Duration.zero);
+
+        libraryBloc.add(const SearchBooks('Гэтсби'));
+        await Future.delayed(Duration.zero);
+
+        expect(libraryBloc.state.filteredBooks.length, 1);
+        expect(libraryBloc.state.filteredBooks.first.title, contains('Гэтсби'));
+      });
+
+      test('filters books by author', () async {
+        libraryBloc.add(const LoadBooks());
+        await Future.delayed(Duration.zero);
+
+        libraryBloc.add(const SearchBooks('Оруэлл'));
+        await Future.delayed(Duration.zero);
+
+        expect(libraryBloc.state.filteredBooks.length, 1);
+        expect(libraryBloc.state.filteredBooks.first.author, contains('Оруэлл'));
+      });
+
+      test('filters books by genre', () async {
+        libraryBloc.add(const LoadBooks());
+        await Future.delayed(Duration.zero);
+
+        libraryBloc.add(const SearchBooks('Fantasy'));
+        await Future.delayed(Duration.zero);
+
+        expect(libraryBloc.state.filteredBooks.isNotEmpty, true);
+      });
+
+      test('returns empty list when no matches found', () async {
+        libraryBloc.add(const LoadBooks());
+        await Future.delayed(Duration.zero);
+
+        libraryBloc.add(const SearchBooks('NonExistent'));
+        await Future.delayed(Duration.zero);
+
+        expect(libraryBloc.state.filteredBooks.length, 0);
+      });
+    });
+
+    group('BookSelected', () {
+      test('updates selectedBook in state', () async {
+        libraryBloc.add(const LoadBooks());
+        await Future.delayed(Duration.zero);
+
+        final book = libraryBloc.state.books.first;
+        libraryBloc.add(BookSelected(book));
+        await Future.delayed(Duration.zero);
+
+        expect(libraryBloc.state.selectedBook?.id, book.id);
+      });
+    });
+
+    group('FilterByStatus', () {
+      test('filters books by status', () async {
+        libraryBloc.add(const LoadBooks());
+        await Future.delayed(Duration.zero);
+
+        libraryBloc.add(const FilterByStatus(BookStatus.reading));
+        await Future.delayed(Duration.zero);
+
+        expect(libraryBloc.state.filteredBooks.every((book) => book.status == BookStatus.reading), true);
+        expect(libraryBloc.state.statusFilter, BookStatus.reading);
+      });
+    });
+
+    group('ClearFilters', () {
+      test('clears search query and shows all books', () async {
+        libraryBloc.add(const LoadBooks());
+        await Future.delayed(Duration.zero);
+
+        libraryBloc.add(const SearchBooks('test'));
+        await Future.delayed(Duration.zero);
+
+        libraryBloc.add(const ClearFilters());
+        await Future.delayed(Duration.zero);
+
+        expect(libraryBloc.state.searchQuery, '');
+        expect(libraryBloc.state.filteredBooks.length, libraryBloc.state.books.length);
+      });
+    });
+  });
+}

bookshelf_flutter/test/bloc/scanner/scanner_bloc_test.dart

@@ -0,0 +1,82 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:bookshelf_flutter/bloc/scanner/scanner_bloc.dart';
+import 'package:bookshelf_flutter/bloc/scanner/scanner_event.dart';
+import 'package:bookshelf_flutter/bloc/scanner/scanner_state.dart';
+
+void main() {
+  group('ScannerBloc', () {
+    late ScannerBloc scannerBloc;
+
+    setUp(() {
+      scannerBloc = ScannerBloc();
+    });
+
+    tearDown(() {
+      scannerBloc.close();
+    });
+
+    test('initial state is ScannerState.initial()', () {
+      expect(scannerBloc.state, isA<ScannerState>());
+      expect(scannerBloc.state.isScanning, false);
+      expect(scannerBloc.state.isProcessing, false);
+    });
+
+    group('StartScanning', () {
+      test('sets isScanning to true and clears errors', () async {
+        scannerBloc.add(const StartScanning());
+        await Future.delayed(Duration.zero);
+
+        expect(scannerBloc.state.isScanning, true);
+        expect(scannerBloc.state.isProcessing, false);
+        expect(scannerBloc.state.errorMessage, isNull);
+      });
+    });
+
+    group('StopScanning', () {
+      test('sets isScanning to false', () async {
+        scannerBloc.add(const StartScanning());
+        await Future.delayed(Duration.zero);
+
+        scannerBloc.add(const StopScanning());
+        await Future.delayed(Duration.zero);
+
+        expect(scannerBloc.state.isScanning, false);
+      });
+    });
+
+    group('BookDetected', () {
+      test('stores detected book data and sets isProcessing to true', () async {
+        final bookData = {
+          'title': 'Detected Book',
+          'author': 'Detected Author',
+        };
+
+        scannerBloc.add(BookDetected(bookData));
+        await Future.delayed(Duration.zero);
+
+        expect(scannerBloc.state.detectedBookData, bookData);
+        expect(scannerBloc.state.isProcessing, true);
+      });
+    });
+
+    group('ClearDetectedBook', () {
+      test('clears detected book data and resets processing', () async {
+        final bookData = {
+          'title': 'Detected Book',
+          'author': 'Detected Author',
+        };
+
+        scannerBloc.add(BookDetected(bookData));
+        await Future.delayed(Duration.zero);
+
+        expect(scannerBloc.state.detectedBookData, isNotNull);
+
+        scannerBloc.add(const ClearDetectedBook());
+        await Future.delayed(Duration.zero);
+
+        expect(scannerBloc.state.detectedBookData, isNull);
+        expect(scannerBloc.state.isProcessing, false);
+      });
+    });
+  });
+}

bookshelf_flutter/test/bloc/settings/settings_bloc_test.dart

@@ -0,0 +1,105 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:bookshelf_flutter/bloc/settings/settings_bloc.dart';
+import 'package:bookshelf_flutter/bloc/settings/settings_event.dart';
+import 'package:bookshelf_flutter/bloc/settings/settings_state.dart';
+
+void main() {
+  group('SettingsBloc', () {
+    late SettingsBloc settingsBloc;
+
+    setUp(() {
+      settingsBloc = SettingsBloc();
+    });
+
+    tearDown(() {
+      settingsBloc.close();
+    });
+
+    test('initial state is SettingsState.initial()', () {
+      expect(settingsBloc.state, isA<SettingsState>());
+      expect(settingsBloc.state.isLoading, true);
+    });
+
+    group('LoadSettings', () {
+      test('loads default settings into state', () async {
+        settingsBloc.add(const LoadSettings());
+        await Future.delayed(Duration.zero);
+
+        expect(settingsBloc.state.isDarkMode, false);
+        expect(settingsBloc.state.language, 'English');
+        expect(settingsBloc.state.notificationsEnabled, true);
+        expect(settingsBloc.state.isLoading, false);
+      });
+    });
+
+    group('UpdateTheme', () {
+      test('updates isDarkMode to true', () async {
+        settingsBloc.add(const UpdateTheme(true));
+        await Future.delayed(Duration.zero);
+
+        expect(settingsBloc.state.isDarkMode, true);
+      });
+
+      test('updates isDarkMode to false', () async {
+        settingsBloc.add(const UpdateTheme(true));
+        await Future.delayed(Duration.zero);
+
+        settingsBloc.add(const UpdateTheme(false));
+        await Future.delayed(Duration.zero);
+
+        expect(settingsBloc.state.isDarkMode, false);
+      });
+    });
+
+    group('UpdateLanguage', () {
+      test('updates language setting', () async {
+        settingsBloc.add(const UpdateLanguage('Russian'));
+        await Future.delayed(Duration.zero);
+
+        expect(settingsBloc.state.language, 'Russian');
+      });
+
+      test('updates language to English', () async {
+        settingsBloc.add(const UpdateLanguage('English'));
+        await Future.delayed(Duration.zero);
+
+        expect(settingsBloc.state.language, 'English');
+      });
+    });
+
+    group('ToggleNotifications', () {
+      test('toggles notifications from true to false', () async {
+        settingsBloc.add(const LoadSettings());
+        await Future.delayed(Duration.zero);
+        expect(settingsBloc.state.notificationsEnabled, true);
+
+        settingsBloc.add(const ToggleNotifications());
+        await Future.delayed(Duration.zero);
+
+        expect(settingsBloc.state.notificationsEnabled, false);
+      });
+
+      test('toggles notifications from false to true', () async {
+        settingsBloc.add(const UpdateTheme(false));
+        await Future.delayed(Duration.zero);
+        settingsBloc.add(const ToggleNotifications());
+        await Future.delayed(Duration.zero);
+        expect(settingsBloc.state.notificationsEnabled, false);
+
+        settingsBloc.add(const ToggleNotifications());
+        await Future.delayed(Duration.zero);
+
+        expect(settingsBloc.state.notificationsEnabled, true);
+      });
+    });
+
+    group('ClearData', () {
+      test('sets dataCleared to true', () async {
+        settingsBloc.add(const ClearData());
+        await Future.delayed(Duration.zero);
+
+        expect(settingsBloc.state.dataCleared, true);
+      });
+    });
+  });
+}

bookshelf_flutter/test/bloc/wishlist/wishlist_bloc_test.dart

@@ -0,0 +1,104 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:bookshelf_flutter/bloc/wishlist/wishlist_bloc.dart';
+import 'package:bookshelf_flutter/bloc/wishlist/wishlist_event.dart';
+import 'package:bookshelf_flutter/bloc/wishlist/wishlist_state.dart';
+import 'package:bookshelf_flutter/models/models.dart';
+
+void main() {
+  group('WishlistBloc', () {
+    late WishlistBloc wishlistBloc;
+
+    setUp(() {
+      wishlistBloc = WishlistBloc();
+    });
+
+    tearDown(() {
+      wishlistBloc.close();
+    });
+
+    test('initial state is WishlistState.initial()', () {
+      expect(wishlistBloc.state, isA<WishlistState>());
+      expect(wishlistBloc.state.isLoading, true);
+    });
+
+    group('LoadWishlist', () {
+      test('loads wishlist books into state', () async {
+        wishlistBloc.add(const LoadWishlist());
+        await Future.delayed(Duration.zero);
+
+        expect(wishlistBloc.state.books.isNotEmpty, true);
+        expect(wishlistBloc.state.filteredBooks.isNotEmpty, true);
+        expect(wishlistBloc.state.isLoading, false);
+      });
+    });
+
+    group('RemoveFromWishlist', () {
+      test('removes book from both lists', () async {
+        wishlistBloc.add(const LoadWishlist());
+        await Future.delayed(Duration.zero);
+
+        final bookId = wishlistBloc.state.books.first.id;
+        wishlistBloc.add(RemoveFromWishlist(bookId));
+        await Future.delayed(Duration.zero);
+
+        expect(
+          wishlistBloc.state.books.any((book) => book.id == bookId),
+          false,
+        );
+        expect(
+          wishlistBloc.state.filteredBooks.any((book) => book.id == bookId),
+          false,
+        );
+      });
+    });
+
+    group('SearchWishlist', () {
+      test('filters books by title', () async {
+        wishlistBloc.add(const LoadWishlist());
+        await Future.delayed(Duration.zero);
+
+        wishlistBloc.add(const SearchWishlist('1984'));
+        await Future.delayed(Duration.zero);
+
+        expect(wishlistBloc.state.filteredBooks.length, 1);
+        expect(wishlistBloc.state.filteredBooks.first.title, contains('1984'));
+      });
+
+      test('filters books by author', () async {
+        wishlistBloc.add(const LoadWishlist());
+        await Future.delayed(Duration.zero);
+
+        wishlistBloc.add(const SearchWishlist('Оруэлл'));
+        await Future.delayed(Duration.zero);
+
+        expect(wishlistBloc.state.filteredBooks.length, 1);
+        expect(wishlistBloc.state.filteredBooks.first.author, contains('Оруэлл'));
+      });
+
+      test('returns empty list when no matches found', () async {
+        wishlistBloc.add(const LoadWishlist());
+        await Future.delayed(Duration.zero);
+
+        wishlistBloc.add(const SearchWishlist('NonExistent'));
+        await Future.delayed(Duration.zero);
+
+        expect(wishlistBloc.state.filteredBooks.length, 0);
+      });
+    });
+
+    group('MoveToLibrary', () {
+      test('updates book status to reading', () async {
+        wishlistBloc.add(const LoadWishlist());
+        await Future.delayed(Duration.zero);
+
+        final bookId = wishlistBloc.state.books.first.id;
+        wishlistBloc.add(MoveToLibrary(bookId));
+        await Future.delayed(Duration.zero);
+
+        final book = wishlistBloc.state.books.firstWhere((b) => b.id == bookId);
+        expect(book.status, BookStatus.reading);
+        expect(wishlistBloc.state.movedBookId, bookId);
+      });
+    });
+  });
+}

bookshelf_flutter/test/widget_test.dart

@@ -0,0 +1,21 @@
+// This is a basic Flutter widget test.
+//
+// To perform an interaction with a widget in your test, use the WidgetTester
+// utility in the flutter_test package. For example, you can send tap and scroll
+// gestures. You can also use WidgetTester to find child widgets in the widget
+// tree, read text, and verify that the values of widget properties are correct.
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:bookshelf_flutter/main.dart';
+
+void main() {
+  testWidgets('App starts successfully', (WidgetTester tester) async {
+    // Build our app and trigger a frame.
+    await tester.pumpWidget(const BookshelfApp());
+
+    // Verify that the app builds successfully
+    expect(find.byType(MaterialApp), findsOneWidget);
+  });
+}