Feat: Added UnitTest for CharityRegistry class

helpmehelpapplication/src/test/java/ntnu/systemutvikling/team6/models/CharityRegistryTest.java

@@ -0,0 +1,87 @@
+package ntnu.systemutvikling.team6.models;
+
+import ntnu.sytemutvikling.team6.models.Charity;
+import ntnu.sytemutvikling.team6.models.CharityRegistry;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class CharityRegistryTest {
+    private CharityRegistry registry;
+    private Charity charity;
+
+    @BeforeEach
+    public void setup(){
+        registry = new CharityRegistry();
+        charity = new Charity("Charity1", "Something Somewhere Somehow", "Cancer");
+    }
+
+
+    @Test
+    void testAddCharitySuccessfully() {
+        registry.addCharity(charity);
+
+        assertEquals(1, registry.getAllCharities().size());
+        assertTrue(registry.getAllCharities().contains(charity));
+    }
+
+    @Test
+    void testAddCharityNullThrowsException() {
+        assertThrows(IllegalArgumentException.class, () -> registry.addCharity(null));
+    }
+
+    @Test
+    void testGetAllCharitiesReturnsUnmodifiableList() {
+        registry.addCharity(charity);
+
+        List<Charity> charities = registry.getAllCharities();
+        assertThrows(UnsupportedOperationException.class, () -> charities.add(charity));
+    }
+
+    @Test
+    void testFindCharityByIdFound() {
+        registry.addCharity(charity);
+
+        Optional<Charity> result = registry.findCharityById(charity.getId());
+
+        assertTrue(result.isPresent());
+        assertEquals(charity, result.get());
+    }
+
+    @Test
+    void testFindCharityByIdNotFound() {
+        Optional<Charity> result = registry.findCharityById(UUID.randomUUID());
+        assertTrue(result.isEmpty());
+    }
+
+    @Test
+    void testFindCharityByIdNullThrowsException() {
+        assertThrows(IllegalArgumentException.class, () -> registry.findCharityById(null));
+    }
+
+    @Test
+    void testRemoveCharitySuccessfully() {
+        registry.addCharity(charity);
+
+        boolean removed = registry.removeCharity(charity.getId());
+
+        assertTrue(removed);
+        assertTrue(registry.getAllCharities().isEmpty());
+    }
+
+    @Test
+    void testRemoveCharityNotFound() {
+        boolean removed = registry.removeCharity(UUID.randomUUID());
+        assertFalse(removed);
+    }
+
+    @Test
+    void testRemoveCharityNullThrowsException() {
+        assertThrows(IllegalArgumentException.class, () -> registry.removeCharity(null));
+    }
+}