fix: integration test expecting createdAt resolution to match up with expected

Author: coling01

src/test/java/uk/gov/hmcts/cp/subscription/integration/SubscriptionUpdateControllerIntegrationTest.java

@@ -7,6 +7,7 @@
 import uk.gov.hmcts.cp.subscription.entities.ClientSubscriptionEntity;
 import uk.gov.hmcts.cp.subscription.model.EntityEventType;
 
+import java.time.format.DateTimeFormatter;
 import java.util.List;
 
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.put;
@@ -24,6 +25,7 @@ void beforeEach() {
     @Test
     void update_client_subscription_should_update_subscription() throws Exception {
         ClientSubscriptionEntity existing = insertSubscription("https://oldendpoint", List.of(EntityEventType.PCR));
+        String existingCreatedAt = existing.getCreatedAt().format(DateTimeFormatter.ISO_LOCAL_DATE_TIME);
         String body = new ObjectMapper().writeValueAsString(request);
         mockMvc.perform(put("/client-subscriptions/{id}", existing.getId())
                         .contentType(MediaType.APPLICATION_JSON)
@@ -35,6 +37,6 @@ void update_client_subscription_should_update_subscription() throws Exception {
                 .andExpect(jsonPath("$.eventTypes.[0]").value("CUSTODIAL_RESULT"))
                 .andExpect(jsonPath("$.eventTypes.[1]").value("PCR"))
                 .andExpect(jsonPath("$.notificationEndpoint.webhookUrl").value("https://my-callback-url"))
-                .andExpect(jsonPath("$.createdAt").value(existing.getCreatedAt().toString()));
+                .andExpect(jsonPath("$.createdAt").value(existingCreatedAt + "Z"));
     }
 }