removing first insert from assertThrows

persistence-modules/spring-boot-persistence-mongodb-2/src/test/java/com/baeldung/boot/composite/key/CustomerServiceIntegrationTest.java

@@ -60,10 +60,10 @@ public class CustomerServiceIntegrationTest {
         ticketId.setVenue("V");
 
         Ticket ticket = new Ticket(ticketId, "Event C");
+        service.insert(ticket);
 
         assertThrows(DuplicateKeyException.class, () -> {
             service.insert(ticket);
-            service.insert(ticket);
         });
     }