diff --git a/tests/Service/CguUserServiceTest.php b/tests/Service/CguUserServiceTest.php
new file mode 100644
index 0000000..cb8079e
--- /dev/null
+++ b/tests/Service/CguUserServiceTest.php
@@ -0,0 +1,219 @@
+<?php
+
+namespace App\Tests\Service;
+
+use App\Entity\Cgu;
+use App\Entity\CguUser;
+use App\Entity\User;
+use App\Repository\CguRepository; // <--- Import your actual repository
+use App\Service\CguUserService;
+use Doctrine\ORM\EntityManagerInterface;
+use Doctrine\ORM\EntityRepository;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+
+class CguUserServiceTest extends TestCase
+{
+    private CguUserService $service;
+    private MockObject|EntityManagerInterface $entityManager;
+
+    protected function setUp(): void
+    {
+        $this->entityManager = $this->createMock(EntityManagerInterface::class);
+        $this->service = new CguUserService($this->entityManager);
+    }
+
+    // ==========================================
+    // TEST: isLatestCguAccepted
+    // ==========================================
+
+    public function testIsLatestCguAcceptedReturnsFalseIfNoCguExists(): void
+    {
+        $user = $this->createMock(User::class);
+
+        // 1. Create a mock of your ACTUAL custom repository
+        // Since 'findLatestCgu' exists in CguRepository, PHPUnit allows this.
+        $cguRepo = $this->createMock(CguRepository::class);
+        $cguRepo->method('findLatestCgu')->willReturn(null);
+
+        $this->entityManager->method('getRepository')
+            ->with(Cgu::class)
+            ->willReturn($cguRepo);
+
+        $this->assertFalse($this->service->isLatestCguAccepted($user));
+    }
+
+    public function testIsLatestCguAcceptedReturnsFalseIfRelationDoesNotExist(): void
+    {
+        $user = $this->createMock(User::class);
+        $latestCgu = new Cgu();
+
+        // Mock CguRepository
+        $cguRepo = $this->createMock(CguRepository::class);
+        $cguRepo->method('findLatestCgu')->willReturn($latestCgu);
+
+        // Mock Generic Repository for CguUser (standard findOneBy)
+        $cguUserRepo = $this->createMock(EntityRepository::class);
+        $cguUserRepo->method('findOneBy')
+            ->with(['users' => $user, 'cgu' => $latestCgu])
+            ->willReturn(null);
+
+        $this->entityManager->method('getRepository')->willReturnMap([
+            [Cgu::class, $cguRepo],
+            [CguUser::class, $cguUserRepo],
+        ]);
+
+        $this->assertFalse($this->service->isLatestCguAccepted($user));
+    }
+
+    public function testIsLatestCguAcceptedReturnsTrueIfAccepted(): void
+    {
+        $user = $this->createMock(User::class);
+        $latestCgu = new Cgu();
+
+        $cguUser = new CguUser();
+        $cguUser->setIsAccepted(true);
+
+        $cguRepo = $this->createMock(CguRepository::class);
+        $cguRepo->method('findLatestCgu')->willReturn($latestCgu);
+
+        $cguUserRepo = $this->createMock(EntityRepository::class);
+        $cguUserRepo->method('findOneBy')->willReturn($cguUser);
+
+        $this->entityManager->method('getRepository')->willReturnMap([
+            [Cgu::class, $cguRepo],
+            [CguUser::class, $cguUserRepo],
+        ]);
+
+        $this->assertTrue($this->service->isLatestCguAccepted($user));
+    }
+
+    // ==========================================
+    // TEST: acceptLatestCgu
+    // ==========================================
+
+    public function testAcceptLatestCguDoNothingIfNoCgu(): void
+    {
+        $user = $this->createMock(User::class);
+
+        $cguRepo = $this->createMock(CguRepository::class);
+        $cguRepo->method('findLatestCgu')->willReturn(null);
+
+        $this->entityManager->method('getRepository')->willReturn($cguRepo);
+
+        $this->entityManager->expects($this->never())->method('persist');
+        $this->entityManager->expects($this->never())->method('flush');
+
+        $this->service->acceptLatestCgu($user);
+    }
+
+    public function testAcceptLatestCguCreatesNewRelation(): void
+    {
+        $user = $this->createMock(User::class);
+        $latestCgu = new Cgu();
+
+        $cguRepo = $this->createMock(CguRepository::class);
+        $cguRepo->method('findLatestCgu')->willReturn($latestCgu);
+
+        $cguUserRepo = $this->createMock(EntityRepository::class);
+        $cguUserRepo->method('findOneBy')->willReturn(null);
+
+        $this->entityManager->method('getRepository')->willReturnMap([
+            [Cgu::class, $cguRepo],
+            [CguUser::class, $cguUserRepo],
+        ]);
+
+        // Capture logic for persist
+        $capturedCguUser = null;
+        $this->entityManager->expects($this->once())
+            ->method('persist')
+            ->with($this->callback(function ($entity) use ($latestCgu, $user, &$capturedCguUser) {
+                // Check basic structure
+                if ($entity instanceof CguUser && $entity->getCgu() === $latestCgu && $entity->getUsers() === $user) {
+                    $capturedCguUser = $entity;
+                    return true;
+                }
+                return false;
+            }));
+
+        $this->entityManager->expects($this->once())->method('flush');
+
+        $this->service->acceptLatestCgu($user);
+
+        // Assert Final State (after setIsAccepted(true) was called)
+        $this->assertNotNull($capturedCguUser);
+        $this->assertTrue($capturedCguUser->isAccepted());
+    }
+
+    public function testAcceptLatestCguUpdatesExistingRelation(): void
+    {
+        $user = $this->createMock(User::class);
+        $latestCgu = new Cgu();
+
+        $cguUser = new CguUser();
+        $cguUser->setIsAccepted(false);
+
+        $cguRepo = $this->createMock(CguRepository::class);
+        $cguRepo->method('findLatestCgu')->willReturn($latestCgu);
+
+        $cguUserRepo = $this->createMock(EntityRepository::class);
+        $cguUserRepo->method('findOneBy')->willReturn($cguUser);
+
+        $this->entityManager->method('getRepository')->willReturnMap([
+            [Cgu::class, $cguRepo],
+            [CguUser::class, $cguUserRepo],
+        ]);
+
+        $this->entityManager->expects($this->never())->method('persist');
+        $this->entityManager->expects($this->once())->method('flush');
+
+        $this->service->acceptLatestCgu($user);
+
+        $this->assertTrue($cguUser->isAccepted());
+    }
+
+    // ==========================================
+    // TEST: declineCgu
+    // ==========================================
+
+    public function testDeclineCguSuccess(): void
+    {
+        $user = $this->createMock(User::class);
+        $cgu = new Cgu();
+
+        $cguUser = new CguUser();
+        $cguUser->setIsAccepted(true);
+
+        $cguUserRepo = $this->createMock(EntityRepository::class);
+        $cguUserRepo->expects($this->once())
+            ->method('findOneBy')
+            ->with(['users' => $user, 'cgu' => $cgu])
+            ->willReturn($cguUser);
+
+        $this->entityManager->method('getRepository')
+            ->with(CguUser::class)
+            ->willReturn($cguUserRepo);
+
+        $this->entityManager->expects($this->once())->method('flush');
+
+        $this->service->declineCgu($user, $cgu);
+
+        $this->assertFalse($cguUser->isAccepted());
+    }
+
+    public function testDeclineCguThrowsExceptionIfNotFound(): void
+    {
+        $user = $this->createMock(User::class);
+        $cgu = new Cgu();
+
+        $cguUserRepo = $this->createMock(EntityRepository::class);
+        $cguUserRepo->method('findOneBy')->willReturn(null);
+
+        $this->entityManager->method('getRepository')->willReturn($cguUserRepo);
+
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('CGU not found for this user');
+
+        $this->service->declineCgu($user, $cgu);
+    }
+}
\ No newline at end of file