diff --git a/lib/api/authentication_api_service.dart b/lib/api/authentication_api_service.dart
index 2aafc8d..5c5683c 100644
--- a/lib/api/authentication_api_service.dart
+++ b/lib/api/authentication_api_service.dart
@@ -7,7 +7,8 @@ part 'authentication_api_service.g.dart';
 
 @RestApi()
 abstract class AuthenticationApiService {
-  factory AuthenticationApiService(Dio dio, {String baseUrl}) = _AuthenticationApiService;
+  factory AuthenticationApiService(Dio dio, {String baseUrl}) =
+      _AuthenticationApiService;
 
   @POST('/oauth/token')
   Future<LoginResponse> login(
diff --git a/lib/env.dart b/lib/env.dart
index 0adb9de..aa6753e 100644
--- a/lib/env.dart
+++ b/lib/env.dart
@@ -4,9 +4,11 @@ class Env {
   static String get restApiEndpoint {
     return FlutterConfig.get('REST_API_ENDPOINT');
   }
+
   static String get clientId {
     return FlutterConfig.get('CLIENT_ID');
   }
+
   static String get clientSecret {
     return FlutterConfig.get('CLIENT_SECRET');
   }
diff --git a/lib/repository/authentication_repository.dart b/lib/repositories/authentication_repository.dart
similarity index 78%
rename from lib/repository/authentication_repository.dart
rename to lib/repositories/authentication_repository.dart
index a8f26ea..7bceca6 100644
--- a/lib/repository/authentication_repository.dart
+++ b/lib/repositories/authentication_repository.dart
@@ -24,18 +24,16 @@ class AuthenticationRepositoryImpl extends AuthenticationRepository {
     required String password,
   }) async {
     try {
-      final response = await _authenticationApiService.login(
-        LoginRequest(
-          email: email,
-          password: password,
-          clientId: Env.clientId,
-          clientSecret: Env.clientSecret,
-          grantType: grantType,
-        ),
-      );
+      final response = await _authenticationApiService.login(LoginRequest(
+        email: email,
+        password: password,
+        clientId: Env.clientId,
+        clientSecret: Env.clientSecret,
+        grantType: grantType,
+      ));
       return response.toLoginModel();
     } catch (exception) {
       throw NetworkExceptions.fromDioException(exception);
     }
   }
-}
\ No newline at end of file
+}
diff --git a/lib/usecases/login_use_case.dart b/lib/usecases/login_use_case.dart
index ba8b792..a069383 100644
--- a/lib/usecases/login_use_case.dart
+++ b/lib/usecases/login_use_case.dart
@@ -1,6 +1,6 @@
 import 'dart:async';
 import 'package:survey_flutter/model/login_model.dart';
-import 'package:survey_flutter/repository/authentication_repository.dart';
+import 'package:survey_flutter/repositories/authentication_repository.dart';
 import 'package:survey_flutter/usecases/base/base_use_case.dart';
 import 'package:injectable/injectable.dart';
 
@@ -32,4 +32,4 @@ class LoginUseCase extends UseCase<LoginModel, LoginParams> {
       return Failed(UseCaseException(exception));
     }
   }
-}
\ No newline at end of file
+}
diff --git a/test/api/repositories/authentication_repository_test.dart b/test/api/repositories/authentication_repository_test.dart
new file mode 100644
index 0000000..ed2fa7a
--- /dev/null
+++ b/test/api/repositories/authentication_repository_test.dart
@@ -0,0 +1,57 @@
+import 'package:flutter_config/flutter_config.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:mockito/mockito.dart';
+import 'package:survey_flutter/repositories/authentication_repository.dart';
+import 'package:survey_flutter/api/exception/network_exceptions.dart';
+import 'package:survey_flutter/model/response/login_response.dart';
+
+import '../../mocks/generate_mocks.mocks.dart';
+
+void main() {
+  group('AuthenticationRepositoryTest', () {
+    late MockAuthenticationApiService mockAuthApiService;
+    late AuthenticationRepositoryImpl authRepository;
+
+    const email = "email";
+    const password = "password";
+
+    setUpAll(() {
+      FlutterConfig.loadValueForTesting({
+        'CLIENT_ID': 'CLIENT_ID',
+        'CLIENT_SECRET': 'CLIENT_SECRET',
+      });
+    });
+
+    setUp(() {
+      mockAuthApiService = MockAuthenticationApiService();
+      authRepository = AuthenticationRepositoryImpl(mockAuthApiService);
+    });
+
+    test('When login successfully, it returns correct model', () async {
+      final loginResponse = LoginResponse(
+        id: "",
+        accessToken: "",
+        tokenType: "",
+        expiresIn: 0,
+        refreshToken: "",
+        createdAt: 0,
+      );
+
+      when(mockAuthApiService.login(any))
+          .thenAnswer((_) async => loginResponse);
+
+      final result =
+          await authRepository.login(email: email, password: password);
+
+      expect(result, loginResponse.toLoginModel());
+    });
+
+    test('When login fail, it returns failed exception', () async {
+      when(mockAuthApiService.login(any)).thenThrow(Exception());
+
+      final result = authRepository.login(email: email, password: password);
+
+      expect(result, throwsA(isA<NetworkExceptions>()));
+    });
+  });
+}
diff --git a/test/api/usecases/login_use_case_test.dart b/test/api/usecases/login_use_case_test.dart
new file mode 100644
index 0000000..cc933f2
--- /dev/null
+++ b/test/api/usecases/login_use_case_test.dart
@@ -0,0 +1,64 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:mockito/mockito.dart';
+import 'package:survey_flutter/model/login_model.dart';
+import 'package:survey_flutter/usecases/base/base_use_case.dart';
+import 'package:survey_flutter/usecases/login_use_case.dart';
+import '../../mocks/generate_mocks.mocks.dart';
+
+void main() {
+  group('LoginUseCaseTest', () {
+    late MockAuthenticationRepository mockAuthRepository;
+    late LoginUseCase useCase;
+
+    const email = "email";
+    const password = "password";
+
+    setUp(() {
+      mockAuthRepository = MockAuthenticationRepository();
+      useCase = LoginUseCase(mockAuthRepository);
+    });
+
+    test('When login success, it returns success model', () async {
+      const loginModel = LoginModel(
+        id: "",
+        accessToken: "",
+        expiresIn: 0,
+        refreshToken: "",
+      );
+      when(mockAuthRepository.login(
+        email: email,
+        password: password,
+      )).thenAnswer((_) async => loginModel);
+
+      final result = await useCase.call(LoginParams(
+        email: email,
+        password: password,
+      ));
+
+      verify(mockAuthRepository.login(
+        email: email,
+        password: password,
+      ));
+      expect(result, isA<Success<LoginModel>>());
+    });
+
+    test('When login fail, it returns failure with exception', () async {
+      when(mockAuthRepository.login(
+        email: email,
+        password: password,
+      )).thenAnswer((_) => Future.error(Exception));
+
+      final result = await useCase.call(LoginParams(
+        email: email,
+        password: password,
+      ));
+
+      verify(mockAuthRepository.login(
+        email: email,
+        password: password,
+      ));
+
+      expect(result, isA<Failed<LoginModel>>());
+    });
+  });
+}
diff --git a/test/mocks/generate_mocks.dart b/test/mocks/generate_mocks.dart
index 56d02d3..9cf6f15 100644
--- a/test/mocks/generate_mocks.dart
+++ b/test/mocks/generate_mocks.dart
@@ -1,11 +1,9 @@
 import 'package:dio/dio.dart';
 import 'package:survey_flutter/api/authentication_api_service.dart';
 import 'package:mockito/annotations.dart';
+import 'package:survey_flutter/repositories/authentication_repository.dart';
 
-@GenerateMocks([
-  AuthenticationApiService,
-  DioError,
-])
+@GenerateMocks([AuthenticationApiService, AuthenticationRepository, DioError])
 main() {
   // empty class to generate mock repository classes
 }