diff --git a/src/test/java/org/example/vet1177/services/VetServiceTest.java b/src/test/java/org/example/vet1177/services/VetServiceTest.java
new file mode 100644
index 00000000..4e4c0a14
--- /dev/null
+++ b/src/test/java/org/example/vet1177/services/VetServiceTest.java
@@ -0,0 +1,182 @@
+package org.example.vet1177.services;
+
+import org.example.vet1177.dto.request.vet.VetRequest;
+import org.example.vet1177.dto.response.vet.VetResponse;
+import org.example.vet1177.entities.*;
+import org.example.vet1177.exception.BusinessRuleException;
+import org.example.vet1177.exception.ResourceNotFoundException;
+import org.example.vet1177.repository.UserRepository;
+import org.example.vet1177.repository.VetRepository;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+@ExtendWith(MockitoExtension.class)
+class VetServiceTest {
+
+    @Mock
+    private VetRepository vetRepository;
+
+    @Mock
+    private UserRepository userRepository;
+
+    @InjectMocks
+    private VetService vetService;
+
+// =========================
+// createVet
+// =========================
+
+    @Test
+    void should_create_vet_successfully_and_update_role() {
+        // Arrange
+        UUID userId = UUID.randomUUID();
+
+        User user = new User();
+        user.setRole(Role.OWNER);
+
+        VetRequest request = new VetRequest(
+                userId,
+                "LIC123",
+                "Surgery",
+                "Info"
+        );
+
+        when(userRepository.findById(userId)).thenReturn(Optional.of(user));
+        when(vetRepository.existsByLicenseId("LIC123")).thenReturn(false);
+        when(vetRepository.existsById(userId)).thenReturn(false);
+        when(vetRepository.save(any())).thenAnswer(inv -> inv.getArgument(0));
+
+        // Act
+        VetResponse response = vetService.createVet(request);
+
+        // Assert
+        assertNotNull(response);
+        assertEquals("LIC123", response.licenseId());
+
+        // viktig: rollen uppdateras
+        assertEquals(Role.VET, user.getRole());
+
+        verify(userRepository).save(user);
+        verify(vetRepository).save(any(Vet.class));
+    }
+
+    @Test
+    void should_throw_when_user_not_found() {
+        UUID userId = UUID.randomUUID();
+
+        VetRequest request = new VetRequest(userId, "LIC123", null, null);
+
+        when(userRepository.findById(userId)).thenReturn(Optional.empty());
+
+        assertThrows(ResourceNotFoundException.class,
+                () -> vetService.createVet(request));
+    }
+
+    @Test
+    void should_throw_when_license_exists() {
+        UUID userId = UUID.randomUUID();
+
+        User user = new User();
+        user.setRole(Role.OWNER);
+
+        VetRequest request = new VetRequest(userId, "LIC123", null, null);
+
+        when(userRepository.findById(userId)).thenReturn(Optional.of(user));
+        when(vetRepository.existsByLicenseId("LIC123")).thenReturn(true);
+
+        assertThrows(BusinessRuleException.class,
+                () -> vetService.createVet(request));
+    }
+
+    @Test
+    void should_throw_when_user_already_vet() {
+        UUID userId = UUID.randomUUID();
+
+        User user = new User();
+        user.setRole(Role.OWNER);
+
+        VetRequest request = new VetRequest(userId, "LIC123", null, null);
+
+        when(userRepository.findById(userId)).thenReturn(Optional.of(user));
+        when(vetRepository.existsByLicenseId("LIC123")).thenReturn(false);
+        when(vetRepository.existsById(userId)).thenReturn(true);
+
+        assertThrows(BusinessRuleException.class,
+                () -> vetService.createVet(request));
+    }
+
+// =========================
+// getAllVets
+// =========================
+
+    @Test
+    void should_return_all_vets() {
+        // Arrange
+        User user = new User();
+        user.setName("Dr. Smith");
+        user.setEmail("test@test.com");
+        user.setActive(true);
+
+        Vet vet = new Vet();
+        vet.setUser(user);
+        vet.setLicenseId("LIC123");
+
+        when(vetRepository.findAll()).thenReturn(List.of(vet));
+
+        // Act
+        var result = vetService.getAllVets();
+
+        // Assert
+        assertEquals(1, result.size());
+        assertEquals("Dr. Smith", result.get(0).name());
+
+        verify(vetRepository).findAll();
+    }
+
+// =========================
+// getVetById
+// =========================
+
+    @Test
+    void should_return_vet_by_id() {
+        UUID id = UUID.randomUUID();
+
+        User user = new User();
+        user.setName("Dr. Smith");
+        user.setEmail("test@test.com");
+        user.setActive(true);
+
+        Vet vet = new Vet();
+        vet.setUser(user);
+        vet.setLicenseId("LIC123");
+
+        when(vetRepository.findById(id)).thenReturn(Optional.of(vet));
+
+        var result = vetService.getVetById(id);
+
+        assertNotNull(result);
+        assertEquals("Dr. Smith", result.name());
+    }
+
+    @Test
+    void should_throw_when_vet_not_found() {
+        UUID id = UUID.randomUUID();
+
+        when(vetRepository.findById(id)).thenReturn(Optional.empty());
+
+        assertThrows(ResourceNotFoundException.class,
+                () -> vetService.getVetById(id));
+    }
+
+
+}