diff --git a/src/modules/authentication/tests/unit/authentication.mapper.spec.ts b/src/modules/authentication/tests/unit/authentication.mapper.spec.ts
index 02046c8..ce78ecc 100644
--- a/src/modules/authentication/tests/unit/authentication.mapper.spec.ts
+++ b/src/modules/authentication/tests/unit/authentication.mapper.spec.ts
@@ -4,6 +4,7 @@ import { Type } from '@modules/authentication/core/domain/username.types';
 import {
   AuthenticationReadModel,
   AuthenticationWriteModel,
+  UsernameModel,
 } from '@modules/authentication/infrastructure/authentication.repository';
 import { AuthenticationResponseDto } from '@modules/authentication/interface/dtos/authentication.response.dto';
 import { Test } from '@nestjs/testing';
@@ -63,8 +64,12 @@ describe('Authentication Mapper', () => {
   it('should map domain entity to persistence data', async () => {
     const mapped: AuthenticationWriteModel =
       authenticationMapper.toPersistence(authenticationEntity);
-    expect(mapped.usernames.create[0].username).toBe('john.doe@email.com');
-    expect(mapped.usernames.create[1].username).toBe('+33611223344');
+    expect(
+      (mapped.usernames as { create: UsernameModel[] }).create[0].username,
+    ).toBe('john.doe@email.com');
+    expect(
+      (mapped.usernames as { create: UsernameModel[] }).create[1].username,
+    ).toBe('+33611223344');
   });
 
   it('should map persisted data to domain entity', async () => {