BAIS payments 멀티모듈 최소 구현 (2/2) (iss-cb58f86e71d9)

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

@@ -0,0 +1,25 @@
+package com.klaro.bais.payments;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.*;
+
+class PaymentReferenceServiceTest {
+
+    private PaymentReferenceService paymentReferenceService = new PaymentReferenceService();
+
+    @Test
+    void testNormalizeWithNull() {
+        assertEquals("", paymentReferenceService.normalize(null));
+    }
+
+    @Test
+    void testNormalizeWithBlank() {
+        assertEquals("", paymentReferenceService.normalize("  "));
+    }
+
+    @Test
+    void testNormalizeWithValidString() {
+        String input = "  test  ";
+        assertEquals("test", paymentReferenceService.normalize(input));
+    }
+}