Unit tests for search books

test/layers/domain/fakes/fake_book_list_domain.dart

@@ -0,0 +1,9 @@
+
+import 'package:mibook/layers/domain/models/book_list_domain.dart';
+
+import 'fake_book_domain.dart';
+
+final fakeBookListDomain = BookListDomain(
+  totalItems: 1,
+  books: [fakeBookDomain],
+);

test/layers/domain/search_books_test.dart

@@ -0,0 +1,61 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:mibook/layers/domain/repository/search_repository.dart';
+import 'package:mibook/layers/domain/usecases/search_books.dart';
+import 'package:mockito/annotations.dart';
+import 'package:mockito/mockito.dart';
+
+import 'fakes/fake_book_list_domain.dart';
+
+@GenerateNiceMocks([MockSpec<ISearchRepository>()])
+import 'search_books_test.mocks.dart';
+
+void main() {
+  late MockISearchRepository mockSearchRepository;
+  late SearchBooks searchBooks;
+
+  setUp(() {
+    mockSearchRepository = MockISearchRepository();
+    searchBooks = SearchBooks(
+      mockSearchRepository,
+    );
+  });
+
+  group('SearchBooks', () {
+    test('call returns BookListDomain on success', () async {
+      when(
+        mockSearchRepository.searchByTitle(
+          initTitle: 'initTitle',
+          startIndex: 0,
+        ),
+      ).thenAnswer((_) async => Future.value(fakeBookListDomain));
+
+      final result = await searchBooks.call(
+        initTitle: 'initTitle',
+        startIndex: 0,
+      );
+      expect(result, fakeBookListDomain);
+    });
+
+    test('call returns BookListDomain on failure', () async {
+      when(
+        mockSearchRepository.searchByTitle(
+          initTitle: 'initTitle',
+          startIndex: 0,
+        ),
+      ).thenThrow(Exception('Something went wrong'));
+
+      var error = false;
+      try {
+        await searchBooks.call(
+          initTitle: 'initTitle',
+          startIndex: 0,
+        );
+        error = false;
+      } catch (e) {
+        error = true;
+      }
+
+      expect(error, isTrue);
+    });
+  });
+}