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 ee8e097..87bb520 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
@@ -1,24 +1,24 @@
 package com.klaro.bais.payments;
 
-import org.junit.jupiter.api.Test;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
-public class PaymentReferenceServiceTest {
+import org.junit.jupiter.api.Test;
 
+class PaymentReferenceServiceTest {
     private final PaymentReferenceService service = new PaymentReferenceService();
 
     @Test
-    public void testNormalize_null() {
+    void testNormalize_NullInput() {
         assertEquals("", service.normalize(null));
     }
 
     @Test
-    public void testNormalize_empty() {
-        assertEquals("", service.normalize("    "));
+    void testNormalize_EmptyInput() {
+        assertEquals("", service.normalize(" "));
     }
 
     @Test
-    public void testNormalize_normalString() {
-        assertEquals("validString", service.normalize("   validString   "));
+    void testNormalize_ValidInput() {
+        assertEquals("valid input", service.normalize("  valid input  " ));
     }
-}
+}
\ No newline at end of file