diff --git a/BE/package-lock.json b/BE/package-lock.json
index dc208c9c..58c19817 100644
--- a/BE/package-lock.json
+++ b/BE/package-lock.json
@@ -18,6 +18,7 @@
         "axios": "^1.7.7",
         "bcrypt": "^5.1.1",
         "class-transformer": "^0.5.1",
+        "class-validator": "^0.14.1",
         "cross-env": "^7.0.3",
         "docker": "^1.0.0",
         "dotenv": "^16.4.5",
@@ -37,7 +38,6 @@
         "@types/jest": "^29.5.2",
         "@types/node": "^20.3.1",
         "@types/supertest": "^6.0.0",
-        "class-validator": "^0.14.1",
         "eslint": "^8.0.0",
         "eslint-config-airbnb-base": "^15.0.0",
         "eslint-config-airbnb-typescript": "^18.0.0",
@@ -2150,7 +2150,6 @@
       "version": "13.12.2",
       "resolved": "https://registry.npmjs.org/@types/validator/-/validator-13.12.2.tgz",
       "integrity": "sha512-6SlHBzUW8Jhf3liqrGGXyTJSIFe4nqlJ5A5KaMZ2l/vbM3Wh3KSybots/wfWVzNLK4D1NZluDlSQIbIEPx6oyA==",
-      "devOptional": true,
       "license": "MIT"
     },
     "node_modules/@types/yargs": {
@@ -3592,7 +3591,6 @@
       "version": "0.14.1",
       "resolved": "https://registry.npmjs.org/class-validator/-/class-validator-0.14.1.tgz",
       "integrity": "sha512-2VEG9JICxIqTpoK1eMzZqaV+u/EiwEJkMGzTrZf6sU/fwsnOITVgYJ8yojSy6CaXtO9V0Cc6ZQZ8h8m4UBuLwQ==",
-      "devOptional": true,
       "license": "MIT",
       "dependencies": {
         "@types/validator": "^13.11.8",
@@ -8129,7 +8127,6 @@
       "version": "1.11.12",
       "resolved": "https://registry.npmjs.org/libphonenumber-js/-/libphonenumber-js-1.11.12.tgz",
       "integrity": "sha512-QkJn9/D7zZ1ucvT++TQSvZuSA2xAWeUytU+DiEQwbPKLyrDpvbul2AFs1CGbRAPpSCCk47aRAb5DX5mmcayp4g==",
-      "devOptional": true,
       "license": "MIT"
     },
     "node_modules/lines-and-columns": {
@@ -11725,7 +11722,6 @@
       "version": "13.12.0",
       "resolved": "https://registry.npmjs.org/validator/-/validator-13.12.0.tgz",
       "integrity": "sha512-c1Q0mCiPlgdTVVVIJIrBuxNicYE+t/7oKeI9MWLj3fh/uq2Pxh/3eeWbVZ4OcGW1TUf53At0njHw5SMdA3tmMg==",
-      "devOptional": true,
       "license": "MIT",
       "engines": {
         "node": ">= 0.10"
@@ -13675,8 +13671,7 @@
     "@types/validator": {
       "version": "13.12.2",
       "resolved": "https://registry.npmjs.org/@types/validator/-/validator-13.12.2.tgz",
-      "integrity": "sha512-6SlHBzUW8Jhf3liqrGGXyTJSIFe4nqlJ5A5KaMZ2l/vbM3Wh3KSybots/wfWVzNLK4D1NZluDlSQIbIEPx6oyA==",
-      "devOptional": true
+      "integrity": "sha512-6SlHBzUW8Jhf3liqrGGXyTJSIFe4nqlJ5A5KaMZ2l/vbM3Wh3KSybots/wfWVzNLK4D1NZluDlSQIbIEPx6oyA=="
     },
     "@types/yargs": {
       "version": "17.0.33",
@@ -14697,7 +14692,6 @@
       "version": "0.14.1",
       "resolved": "https://registry.npmjs.org/class-validator/-/class-validator-0.14.1.tgz",
       "integrity": "sha512-2VEG9JICxIqTpoK1eMzZqaV+u/EiwEJkMGzTrZf6sU/fwsnOITVgYJ8yojSy6CaXtO9V0Cc6ZQZ8h8m4UBuLwQ==",
-      "devOptional": true,
       "requires": {
         "@types/validator": "^13.11.8",
         "libphonenumber-js": "^1.10.53",
@@ -17965,8 +17959,7 @@
     "libphonenumber-js": {
       "version": "1.11.12",
       "resolved": "https://registry.npmjs.org/libphonenumber-js/-/libphonenumber-js-1.11.12.tgz",
-      "integrity": "sha512-QkJn9/D7zZ1ucvT++TQSvZuSA2xAWeUytU+DiEQwbPKLyrDpvbul2AFs1CGbRAPpSCCk47aRAb5DX5mmcayp4g==",
-      "devOptional": true
+      "integrity": "sha512-QkJn9/D7zZ1ucvT++TQSvZuSA2xAWeUytU+DiEQwbPKLyrDpvbul2AFs1CGbRAPpSCCk47aRAb5DX5mmcayp4g=="
     },
     "lines-and-columns": {
       "version": "1.2.4",
@@ -20437,8 +20430,7 @@
     "validator": {
       "version": "13.12.0",
       "resolved": "https://registry.npmjs.org/validator/-/validator-13.12.0.tgz",
-      "integrity": "sha512-c1Q0mCiPlgdTVVVIJIrBuxNicYE+t/7oKeI9MWLj3fh/uq2Pxh/3eeWbVZ4OcGW1TUf53At0njHw5SMdA3tmMg==",
-      "devOptional": true
+      "integrity": "sha512-c1Q0mCiPlgdTVVVIJIrBuxNicYE+t/7oKeI9MWLj3fh/uq2Pxh/3eeWbVZ4OcGW1TUf53At0njHw5SMdA3tmMg=="
     },
     "vary": {
       "version": "1.1.2",
diff --git a/BE/package.json b/BE/package.json
index 4bcb6550..569138b9 100644
--- a/BE/package.json
+++ b/BE/package.json
@@ -29,6 +29,7 @@
     "axios": "^1.7.7",
     "bcrypt": "^5.1.1",
     "class-transformer": "^0.5.1",
+    "class-validator": "^0.14.1",
     "cross-env": "^7.0.3",
     "docker": "^1.0.0",
     "dotenv": "^16.4.5",
@@ -48,7 +49,6 @@
     "@types/jest": "^29.5.2",
     "@types/node": "^20.3.1",
     "@types/supertest": "^6.0.0",
-    "class-validator": "^0.14.1",
     "eslint": "^8.0.0",
     "eslint-config-airbnb-base": "^15.0.0",
     "eslint-config-airbnb-typescript": "^18.0.0",
diff --git a/BE/src/auth/auth.controller.spec.ts b/BE/src/auth/auth.controller.spec.ts
index 27a31e61..8791f7dc 100644
--- a/BE/src/auth/auth.controller.spec.ts
+++ b/BE/src/auth/auth.controller.spec.ts
@@ -1,5 +1,7 @@
 import { Test, TestingModule } from '@nestjs/testing';
 import { AuthController } from './auth.controller';
+import { AuthService } from './auth.service';
+import { UserRepository } from './user.repository';
 
 describe('AuthController', () => {
   let controller: AuthController;
@@ -7,6 +9,17 @@ describe('AuthController', () => {
   beforeEach(async () => {
     const module: TestingModule = await Test.createTestingModule({
       controllers: [AuthController],
+      providers: [
+        AuthService,
+        {
+          provide: UserRepository,
+          useValue: {
+            find: jest.fn(),
+            findOne: jest.fn(),
+            save: jest.fn(),
+          },
+        },
+      ],
     }).compile();
 
     controller = module.get<AuthController>(AuthController);
diff --git a/BE/src/auth/auth.service.spec.ts b/BE/src/auth/auth.service.spec.ts
index 800ab662..cc1425f3 100644
--- a/BE/src/auth/auth.service.spec.ts
+++ b/BE/src/auth/auth.service.spec.ts
@@ -1,12 +1,25 @@
 import { Test, TestingModule } from '@nestjs/testing';
 import { AuthService } from './auth.service';
+import { AuthController } from './auth.controller';
+import { UserRepository } from './user.repository';
 
 describe('AuthService', () => {
   let service: AuthService;
 
   beforeEach(async () => {
     const module: TestingModule = await Test.createTestingModule({
-      providers: [AuthService],
+      controllers: [AuthController],
+      providers: [
+        AuthService,
+        {
+          provide: UserRepository,
+          useValue: {
+            find: jest.fn(),
+            findOne: jest.fn(),
+            save: jest.fn(),
+          },
+        },
+      ],
     }).compile();
 
     service = module.get<AuthService>(AuthService);
diff --git a/BE/src/auth/dto/authCredentials.dto.ts b/BE/src/auth/dto/authCredentials.dto.ts
index d8e67287..1ca2cf30 100644
--- a/BE/src/auth/dto/authCredentials.dto.ts
+++ b/BE/src/auth/dto/authCredentials.dto.ts
@@ -1,4 +1,5 @@
 import { IsString, Matches, MaxLength, MinLength } from 'class-validator';
+
 export class AuthCredentialsDto {
   @IsString()
   @MinLength(4)