src/test/java/com/klaro/bais/PaymentServiceTest.java

@@ -1,25 +1,24 @@
 package com.klaro.bais;
 
-import static org.junit.jupiter.api.Assertions.*;
 import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.*;
 
-public class PaymentServiceTest {
+class PaymentServiceTest {
+
+    private final PaymentService paymentService = new PaymentService();
 
     @Test
-    public void testApprovePositiveAmount() {
-        PaymentService service = new PaymentService();
-        assertTrue(service.approve(100)); // Positive amount should be approved
+    void testApprovePositiveAmount() {
+        assertTrue(paymentService.approve(100)); // 100 should be approved
     }
 
     @Test
-    public void testApproveZeroAmount() {
-        PaymentService service = new PaymentService();
-        assertFalse(service.approve(0)); // Zero amount should be rejected
+    void testApproveZeroAmount() {
+        assertFalse(paymentService.approve(0)); // 0 should not be approved
     }
 
     @Test
-    public void testApproveNegativeAmount() {
-        PaymentService service = new PaymentService();
-        assertFalse(service.approve(-50)); // Negative amount should be rejected
+    void testApproveNegativeAmount() {
+        assertFalse(paymentService.approve(-100)); // Negative should not be approved
     }
-}
+}