diff --git a/services/payments/src/test/java/com/klaro/bais/payments/PaymentReferenceServiceTest.java b/services/payments/src/test/java/com/klaro/bais/payments/PaymentReferenceServiceTest.java
index 77624c9..6c139a6 100644
--- a/services/payments/src/test/java/com/klaro/bais/payments/PaymentReferenceServiceTest.java
+++ b/services/payments/src/test/java/com/klaro/bais/payments/PaymentReferenceServiceTest.java
@@ -1,28 +1,25 @@
 package com.klaro.bais.payments;
 
 import org.junit.jupiter.api.Test;
-import static org.junit.jupiter.api.Assertions.*;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 class PaymentReferenceServiceTest {
+
     private final PaymentReferenceService service = new PaymentReferenceService();
 
     @Test
-    void testNormalize_NullInput() {
+    void testNormalizeWithNull() {
         assertEquals("", service.normalize(null));
     }
 
     @Test
-    void testNormalize_EmptyInput() {
+    void testNormalizeWithEmptyString() {
         assertEquals("", service.normalize(""));
     }
 
     @Test
-    void testNormalize_WhitespaceInput() {
-        assertEquals("", service.normalize("   "));
+    void testNormalizeWithNormalString() {
+        assertEquals("Hello, World!", service.normalize("   Hello, World!   ")); 
     }
-
-    @Test
-    void testNormalize_ValidInput() {
-        assertEquals("valid", service.normalize(" valid "));
-    }
-}
\ No newline at end of file
+}