feat: Introduce comprehensive unit tests for models and BLoCs using mockito and bloc_test, and refine TripBloc error handling.

test/models/user_test.dart

@@ -0,0 +1,139 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:travel_mate/models/user.dart';
+
+void main() {
+  group('User Model Tests', () {
+    const userId = '123';
+    const email = 'test@example.com';
+    const nom = 'Doe';
+    const prenom = 'John';
+    const platform = 'email';
+    const phoneNumber = '1234567890';
+    const profilePictureUrl = 'http://example.com/pic.jpg';
+
+    final user = User(
+      id: userId,
+      nom: nom,
+      prenom: prenom,
+      email: email,
+      platform: platform,
+      phoneNumber: phoneNumber,
+      profilePictureUrl: profilePictureUrl,
+    );
+
+    test('supports value equality', () {
+      final user2 = User(
+        id: userId,
+        nom: nom,
+        prenom: prenom,
+        email: email,
+        platform: platform,
+        phoneNumber: phoneNumber,
+        profilePictureUrl: profilePictureUrl,
+      );
+      expect(user, equals(user2));
+    });
+
+    test('props correct', () {
+      expect(user.id, userId);
+      expect(user.nom, nom);
+      expect(user.prenom, prenom);
+      expect(user.email, email);
+      expect(user.platform, platform);
+      expect(user.phoneNumber, phoneNumber);
+      expect(user.profilePictureUrl, profilePictureUrl);
+      expect(user.fullName, '$prenom $nom');
+    });
+
+    group('fromJson', () {
+      test('returns correct user from valid json', () {
+        final jsonStr =
+            '''
+          {
+            "id": "$userId",
+            "nom": "$nom",
+            "prenom": "$prenom",
+            "email": "$email",
+            "platform": "$platform",
+            "phoneNumber": "$phoneNumber",
+            "profilePictureUrl": "$profilePictureUrl"
+          }
+        ''';
+        expect(User.fromJson(jsonStr), equals(user));
+      });
+    });
+
+    group('fromMap', () {
+      test('returns correct user from valid map', () {
+        final map = {
+          'id': userId,
+          'nom': nom,
+          'prenom': prenom,
+          'email': email,
+          'platform': platform,
+          'phoneNumber': phoneNumber,
+          'profilePictureUrl': profilePictureUrl,
+        };
+        expect(User.fromMap(map), equals(user));
+      });
+
+      test('handles null/missing values gracefully', () {
+        final map = {
+          'id': userId,
+          // Missing nom
+          // Missing prenom
+          // Missing email
+          // Missing platform
+          // Missing phoneNumber
+          // Missing profilePictureUrl
+        };
+        final userFromMap = User.fromMap(map);
+        expect(userFromMap.id, userId);
+        expect(userFromMap.nom, '');
+        expect(userFromMap.prenom, '');
+        expect(userFromMap.email, '');
+        expect(userFromMap.platform, '');
+        expect(userFromMap.phoneNumber, null);
+        expect(userFromMap.profilePictureUrl, null);
+      });
+    });
+
+    group('toJson', () {
+      test('returns correct json string', () {
+        final expectedJson =
+            '{"id":"$userId","nom":"$nom","prenom":"$prenom","email":"$email","profilePictureUrl":"$profilePictureUrl","phoneNumber":"$phoneNumber","platform":"$platform"}';
+        expect(user.toJson(), expectedJson);
+      });
+    });
+
+    group('toMap', () {
+      test('returns correct map', () {
+        final expectedMap = {
+          'id': userId,
+          'nom': nom,
+          'prenom': prenom,
+          'email': email,
+          'profilePictureUrl': profilePictureUrl,
+          'phoneNumber': phoneNumber,
+          'platform': platform,
+        };
+        expect(user.toMap(), expectedMap);
+      });
+    });
+
+    group('copyWith', () {
+      test('returns object with updated values', () {
+        const newNom = 'Smith';
+        final updatedUser = user.copyWith(nom: newNom);
+        expect(updatedUser.nom, newNom);
+        expect(updatedUser.prenom, prenom);
+        expect(updatedUser.email, email);
+      });
+
+      test('returns same object if no values provided', () {
+        final updatedUser = user.copyWith();
+        expect(updatedUser, equals(user));
+      });
+    });
+  });
+}