diff --git a/libs/user-sdk-event/src/test/java/it/pagopa/selfcare/user/UserUtilsTest.java b/libs/user-sdk-event/src/test/java/it/pagopa/selfcare/user/UserUtilsTest.java
index 343d3f62..f8cfe5f0 100644
--- a/libs/user-sdk-event/src/test/java/it/pagopa/selfcare/user/UserUtilsTest.java
+++ b/libs/user-sdk-event/src/test/java/it/pagopa/selfcare/user/UserUtilsTest.java
@@ -9,10 +9,7 @@
 import java.time.LocalTime;
 import java.time.OffsetDateTime;
 import java.time.ZoneOffset;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.List;
-import java.util.Map;
+import java.util.*;
 
 import static org.junit.jupiter.api.Assertions.*;
 
@@ -124,4 +121,82 @@ void getHMAC256_withValidInputs_shouldReturnValidHash() {
 
         assertNotNull(hash);
     }
+
+    @Test
+    void retrieveFdProductIfItChanged_withValidProducts_shouldReturnMostRecentlyUpdatedProduct() {
+        List<OnboardedProduct> products = new ArrayList<>();
+        OnboardedProduct product1 = new OnboardedProduct();
+        product1.setProductId("1");
+        product1.setUpdatedAt(OffsetDateTime.now().minusDays(1));
+        product1.setCreatedAt(OffsetDateTime.now().minusDays(2));
+        products.add(product1);
+
+        OnboardedProduct product2 = new OnboardedProduct();
+        product2.setProductId("2");
+        product2.setUpdatedAt(OffsetDateTime.now());
+        product2.setCreatedAt(OffsetDateTime.now().minusDays(1));
+        products.add(product2);
+
+        List<String> productIdToCheck = List.of("1", "2");
+
+        OnboardedProduct result = UserUtils.retrieveFdProductIfItChanged(products, productIdToCheck);
+
+        assertNotNull(result);
+        assertEquals("2", result.getProductId());
+    }
+
+    @Test
+    void retrieveFdProductIfItChanged_withEmptyProductList() {
+        List<OnboardedProduct> products = Collections.emptyList();
+        List<String> productIdToCheck = List.of("1", "2");
+
+        OnboardedProduct result = UserUtils.retrieveFdProductIfItChanged(products, productIdToCheck);
+
+        assertNull(result);
+    }
+
+    @Test
+    void retrieveFdProductIfItChanged_withNoFdProductIds() {
+        List<OnboardedProduct> products = new ArrayList<>();
+        OnboardedProduct product1 = new OnboardedProduct();
+        product1.setProductId("1");
+        product1.setUpdatedAt(OffsetDateTime.now().minusDays(1));
+        product1.setCreatedAt(OffsetDateTime.now().minusDays(2));
+        products.add(product1);
+
+        OnboardedProduct product2 = new OnboardedProduct();
+        product2.setProductId("2");
+        product2.setUpdatedAt(OffsetDateTime.now());
+        product2.setCreatedAt(OffsetDateTime.now().minusDays(1));
+        products.add(product2);
+
+        List<String> productIdToCheck = List.of("3", "4");
+
+        OnboardedProduct result = UserUtils.retrieveFdProductIfItChanged(products, productIdToCheck);
+
+        assertNull(result);
+    }
+
+    @Test
+    void retrieveFdProductIfItChanged_withProductsWithSameUpdatedAt() {
+        List<OnboardedProduct> products = new ArrayList<>();
+        OnboardedProduct product1 = new OnboardedProduct();
+        product1.setProductId("1");
+        product1.setUpdatedAt(OffsetDateTime.now());
+        product1.setCreatedAt(OffsetDateTime.now().minusDays(2));
+        products.add(product1);
+
+        OnboardedProduct product2 = new OnboardedProduct();
+        product2.setProductId("2");
+        product2.setUpdatedAt(OffsetDateTime.now());
+        product2.setCreatedAt(OffsetDateTime.now().minusDays(1));
+        products.add(product2);
+
+        List<String> productIdToCheck = List.of("1", "2");
+
+        OnboardedProduct result = UserUtils.retrieveFdProductIfItChanged(products, productIdToCheck);
+
+        assertNotNull(result);
+        assertEquals("2", result.getProductId());
+    }
 }