diff --git a/.gitignore b/.gitignore
index 899de41..0122a41 100644
--- a/.gitignore
+++ b/.gitignore
@@ -168,4 +168,5 @@ app.*.symbols
 *.freezed.dart
 *.g.dart
 */di.config.dart
-*.mocks.dart
\ No newline at end of file
+*.mocks.dart
+lib/core/di/di.config.dart
diff --git a/test/search_data_source_test.dart b/test/layers/data/datasource/search_data_source_test.dart
similarity index 100%
rename from test/search_data_source_test.dart
rename to test/layers/data/datasource/search_data_source_test.dart
diff --git a/test/layers/domain/fakes/fake_book_domain.dart b/test/layers/domain/fakes/fake_book_domain.dart
new file mode 100644
index 0000000..e7aa8a9
--- /dev/null
+++ b/test/layers/domain/fakes/fake_book_domain.dart
@@ -0,0 +1,10 @@
+import 'package:mibook/layers/domain/models/book_list_domain.dart';
+
+final fakeBookDomain = BookDomain(
+  id: 'id',
+  title: 'title',
+  description: 'description',
+  thumbnail: 'thumbnail',
+  authors: [],
+  kind: 'kind',
+);
diff --git a/test/layers/domain/fakes/fake_book_list_domain.dart b/test/layers/domain/fakes/fake_book_list_domain.dart
new file mode 100644
index 0000000..8c7a890
--- /dev/null
+++ b/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],
+);
diff --git a/test/layers/domain/get_book_details_test.dart b/test/layers/domain/get_book_details_test.dart
new file mode 100644
index 0000000..ee5165e
--- /dev/null
+++ b/test/layers/domain/get_book_details_test.dart
@@ -0,0 +1,52 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:mibook/layers/domain/repository/search_repository.dart';
+import 'package:mibook/layers/domain/usecases/get_book_details.dart';
+import 'package:mockito/annotations.dart';
+import 'package:mockito/mockito.dart';
+import 'fakes/fake_book_domain.dart';
+
+@GenerateNiceMocks([MockSpec<ISearchRepository>()])
+import 'get_book_details_test.mocks.dart';
+
+void main() {
+  late MockISearchRepository mockSearchRepository;
+  late GetBookDetails getBookDetails;
+
+  setUp(() {
+    mockSearchRepository = MockISearchRepository();
+    getBookDetails = GetBookDetails(
+      mockSearchRepository,
+    );
+  });
+
+  group('GetBookDetails', () {
+    test('call returns BookDetails on success', () async {
+      when(
+        mockSearchRepository.searchById(
+          id: 'id',
+        ),
+      ).thenAnswer((_) async => Future.value(fakeBookDomain));
+
+      final result = await getBookDetails.call(id: 'id');
+      expect(result, fakeBookDomain);
+    });
+
+    test('call returns BookDetails on failure', () async {
+      when(
+        mockSearchRepository.searchById(
+          id: 'id',
+        ),
+      ).thenThrow(Exception('Something went wrong'));
+
+      var error = false;
+      try {
+        await getBookDetails.call(id: 'id');
+        error = false;
+      } catch (e) {
+        error = true;
+      }
+
+      expect(error, isTrue);
+    });
+  });
+}
diff --git a/test/layers/domain/search_books_test.dart b/test/layers/domain/search_books_test.dart
new file mode 100644
index 0000000..ab033ac
--- /dev/null
+++ b/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);
+    });
+  });
+}