fixed exception and test exception

src/main/java/com/nisum/ascend/inventory/exception/ResourceNotFoundException.java

 package com.nisum.ascend.inventory.exception;
 
 import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
 
+@ResponseStatus(value = HttpStatus.NOT_FOUND)
 public class ResourceNotFoundException extends Exception{
     HttpStatus status;
 

src/test/java/com/nisum/ascend/inventory/controller/ProductControllerTest.java

@@ -32,6 +32,12 @@ class ProductControllerTest {
     @Autowired
     private WebTestClient client;
 
+
+    @BeforeEach
+    public  void setup(){
+
+    }
+
     @Test
     void testProductInvalidSkuNotFound() {
         client
@@ -39,7 +45,7 @@ class ProductControllerTest {
                 .uri("/products/".concat("{sku}"), "invalid")
                 .exchange()
                 .expectStatus()
-                .is5xxServerError();
+                .isNotFound();
     }
 
     @Test