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

@@ -0,0 +1,23 @@
+package com.klaro.bais;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.*;
+
+public class PaymentServiceTest {
+    private final PaymentService paymentService = new PaymentService();
+
+    @Test
+    public void testApproveWithPositiveAmount() {
+        assertTrue(paymentService.approve(100));
+    }
+
+    @Test
+    public void testApproveWithZeroAmount() {
+        assertFalse(paymentService.approve(0));
+    }
+
+    @Test
+    public void testApproveWithNegativeAmount() {
+        assertFalse(paymentService.approve(-100));
+    }
+}