test: added negative tests for DonationTest

src/test/java/edu/group5/app/model/donation/DonationTest.java

@@ -1,23 +1,99 @@
 package edu.group5.app.model.donation;
 
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
 import java.math.BigDecimal;
 import java.sql.Timestamp;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 
 public class DonationTest {
+
+  private String expectedMessage;
+  private int donationId1;
+  private int userId1;
+  private int organizationId1;
+  private BigDecimal amount1;
+  private Timestamp date1;
+  private String paymentMethod1;
+  private Donation donation;
+
+  @BeforeEach
+  void setUp(){
+    donationId1 = 1;
+    userId1 = 101;
+    organizationId1 =  202;
+    amount1 = new BigDecimal("500.0");
+    date1 = new Timestamp(System.currentTimeMillis());
+    paymentMethod1 = "Card";
+    donation = new Donation(donationId1, userId1,
+        organizationId1, amount1, date1, paymentMethod1);
+
+  }
+
+  private void exceptionTest(int donationId, int userId,
+                             int organizationId, BigDecimal amount,
+                             Timestamp date, String paymentMethod) {
+    IllegalArgumentException exception = assertThrows(
+        IllegalArgumentException.class, () -> new Donation(
+            donationId, userId, organizationId, amount, date, paymentMethod)
+    );
+    assertEquals(expectedMessage, exception.getMessage());
+  }
+
+  @Test
+  void testIfDonationGetsDonationValues() {
+
+    assertEquals(1, donation.donationId());
+    assertEquals(101, donation.userId());
+    assertEquals(202, donation.organizationId());
+    assertEquals(new BigDecimal("500.0"), donation.amount());
+    assertEquals(date1, donation.date());
+    assertEquals("Card", donation.paymentMethod());
+  }
+
+  @Test
+  void testIfThrowsExceptionWhenDonationIdIsNotPositive() {
+    expectedMessage = "Donation ID must be positive";
+    exceptionTest(0, userId1, organizationId1,
+        amount1, date1, paymentMethod1);
+  }
+
+  @Test
+  void testIfThrowsExceptionWhenUserIdIsNotPositive() {
+    expectedMessage = "User ID must be positive";
+    exceptionTest(donationId1, -1, organizationId1,
+        amount1, date1, paymentMethod1);
+  }
+  @Test
+  void testIfThrowsExceptionWhenOrganizationIdIsNotPositive() {
+    expectedMessage = "Organization ID must be positive";
+    exceptionTest(donationId1, userId1, 0,
+        amount1, date1, paymentMethod1);
+  }
   @Test
-  void testConstructorAndGetters() {
-    Timestamp now = new Timestamp(System.currentTimeMillis());
-    Donation donation = new Donation(1, 101, 202, new BigDecimal("500.0"), now, "Card");
-    assertEquals(1, donation.getDonationId());
-    assertEquals(101, donation.getUserId());
-    assertEquals(202, donation.getOrganizationId());
-    assertEquals(new BigDecimal("500.0"), donation.getAmount());
-    assertEquals(now, donation.getDate());
-    assertEquals("Card", donation.getPaymentMethod());
+  void testIfThrowsExceptionWhenAmountIsNotPositive() {
+    expectedMessage = "Amount must be positive and not null";
+    exceptionTest(donationId1, userId1, organizationId1,
+        new BigDecimal("0.00"), date1, paymentMethod1);
   }
+  @Test
+  void testIfThrowsExceptionWhenDateIsNull() {
+    expectedMessage = "Date must not be null";
+    exceptionTest(donationId1, userId1, organizationId1,
+        amount1, null, paymentMethod1);
+  }
+  @Test
+  void testIfThrowsExceptionWhenPaymentMethodIsNullOrEmpty() {
+    expectedMessage = "Payment method must not be empty";
+    exceptionTest(donationId1, userId1, organizationId1,
+        amount1, date1, null);
+    exceptionTest(donationId1, userId1, organizationId1,
+        amount1, date1, " ");
+
+  }
+
 
 }