diff --git a/backend/src/test/java/com/printcalculator/controller/admin/AdminOrderControllerStatusValidationTest.java b/backend/src/test/java/com/printcalculator/controller/admin/AdminOrderControllerStatusValidationTest.java
new file mode 100644
index 0000000..ee5e96a
--- /dev/null
+++ b/backend/src/test/java/com/printcalculator/controller/admin/AdminOrderControllerStatusValidationTest.java
@@ -0,0 +1,107 @@
+package com.printcalculator.controller.admin;
+
+import com.printcalculator.dto.AdminOrderStatusUpdateRequest;
+import com.printcalculator.dto.OrderDto;
+import com.printcalculator.entity.Order;
+import com.printcalculator.repository.OrderItemRepository;
+import com.printcalculator.repository.OrderRepository;
+import com.printcalculator.repository.PaymentRepository;
+import com.printcalculator.service.InvoicePdfRenderingService;
+import com.printcalculator.service.PaymentService;
+import com.printcalculator.service.QrBillService;
+import com.printcalculator.service.StorageService;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.server.ResponseStatusException;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+@ExtendWith(MockitoExtension.class)
+class AdminOrderControllerStatusValidationTest {
+
+    @Mock
+    private OrderRepository orderRepository;
+    @Mock
+    private OrderItemRepository orderItemRepository;
+    @Mock
+    private PaymentRepository paymentRepository;
+    @Mock
+    private PaymentService paymentService;
+    @Mock
+    private StorageService storageService;
+    @Mock
+    private InvoicePdfRenderingService invoicePdfRenderingService;
+    @Mock
+    private QrBillService qrBillService;
+
+    private AdminOrderController controller;
+
+    @BeforeEach
+    void setUp() {
+        controller = new AdminOrderController(
+                orderRepository,
+                orderItemRepository,
+                paymentRepository,
+                paymentService,
+                storageService,
+                invoicePdfRenderingService,
+                qrBillService
+        );
+    }
+
+    @Test
+    void updateOrderStatus_withInvalidStatus_shouldReturn400AndNotSave() {
+        UUID orderId = UUID.randomUUID();
+        Order order = new Order();
+        order.setId(orderId);
+        order.setStatus("PENDING_PAYMENT");
+
+        when(orderRepository.findById(orderId)).thenReturn(Optional.of(order));
+
+        AdminOrderStatusUpdateRequest payload = new AdminOrderStatusUpdateRequest();
+        payload.setStatus("REPORTED");
+
+        ResponseStatusException ex = assertThrows(
+                ResponseStatusException.class,
+                () -> controller.updateOrderStatus(orderId, payload)
+        );
+
+        assertEquals(HttpStatus.BAD_REQUEST, ex.getStatusCode());
+        verify(orderRepository, never()).save(any(Order.class));
+    }
+
+    @Test
+    void updateOrderStatus_withValidStatus_shouldReturn200() {
+        UUID orderId = UUID.randomUUID();
+        Order order = new Order();
+        order.setId(orderId);
+        order.setStatus("PENDING_PAYMENT");
+
+        when(orderRepository.findById(orderId)).thenReturn(Optional.of(order));
+        when(orderItemRepository.findByOrder_Id(orderId)).thenReturn(List.of());
+        when(paymentRepository.findByOrder_Id(orderId)).thenReturn(Optional.empty());
+
+        AdminOrderStatusUpdateRequest payload = new AdminOrderStatusUpdateRequest();
+        payload.setStatus("PAID");
+
+        ResponseEntity<OrderDto> response = controller.updateOrderStatus(orderId, payload);
+
+        assertEquals(HttpStatus.OK, response.getStatusCode());
+        assertEquals("PAID", response.getBody().getStatus());
+        verify(orderRepository).save(order);
+    }
+}