services/payments/src/test/java/com/klaro/bais/payments/PaymentReferenceServiceTest.java

@@ -0,0 +1,24 @@
+package com.klaro.bais.payments;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class PaymentReferenceServiceTest {
+
+    private final PaymentReferenceService service = new PaymentReferenceService();
+
+    @Test
+    void testNormalizeNull() {
+        assertEquals("", service.normalize(null));
+    }
+
+    @Test
+    void testNormalizeWhitespace() {
+        assertEquals("", service.normalize("  "));
+    }
+
+    @Test
+    void testNormalizeString() {
+        assertEquals("test", service.normalize(" test "));
+    }
+}