✅ réussite des test fin de cette feature

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/subscription/exception/SubscriptionNotFoundException.java

@@ -0,0 +1,21 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.subscription.exception;
+
+import java.text.MessageFormat;
+import java.util.Optional;
+import java.util.UUID;
+
+public class SubscriptionNotFoundException extends RuntimeException {
+    public static final String THE_SUBSCRIPTION_WITH_CUSTOMER_ID_DOES_NOT_EXIST_MESSAGE = "The subscriptions with the customer id {0} does not exists";
+    public static final String THE_SUBSCRIPTION_WITH_SUBSCRIPTION_ID_DOES_NOT_EXIST_MESSAGE = "The subscription with subscription id {0} does not exists";
+
+    public SubscriptionNotFoundException(Optional<UUID> customerUUID, Optional<UUID> subscriptionUUID) {
+        super(buildMessage(customerUUID, subscriptionUUID));
+    }
+
+    private static String buildMessage(Optional<UUID> customerUUID, Optional<UUID> subscriptionUUID) {
+        if (customerUUID.isPresent()) {
+            return MessageFormat.format(THE_SUBSCRIPTION_WITH_CUSTOMER_ID_DOES_NOT_EXIST_MESSAGE, customerUUID.get());
+        }
+        return MessageFormat.format(THE_SUBSCRIPTION_WITH_SUBSCRIPTION_ID_DOES_NOT_EXIST_MESSAGE, subscriptionUUID.get());
+    }
+}

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/subscription/repository/SubscriptionRepository.java

@@ -1,4 +1,4 @@
-package fr.iut_fbleau.but3.dev62.mylibrary.subscription;
+package fr.iut_fbleau.but3.dev62.mylibrary.subscription.repository;
 
 import fr.iut_fbleau.but3.dev62.mylibrary.subscription.entity.Subscription;
 

src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/subscription/usecase/SubscriptionUseCase.java

@@ -0,0 +1,110 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.subscription.usecase;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.subscription.PaymentMethodInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.subscription.SubscriptionDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.subscription.SubscriptionInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.subscription.converter.SubscriptionConverter;
+import fr.iut_fbleau.but3.dev62.mylibrary.subscription.entity.PaymentMethod;
+import fr.iut_fbleau.but3.dev62.mylibrary.subscription.entity.Subscription;
+import fr.iut_fbleau.but3.dev62.mylibrary.subscription.exception.NotValidSubscriptionException;
+import fr.iut_fbleau.but3.dev62.mylibrary.subscription.exception.SubscriptionNotFoundException;
+import fr.iut_fbleau.but3.dev62.mylibrary.subscription.repository.SubscriptionRepository;
+import fr.iut_fbleau.but3.dev62.mylibrary.subscription.validator.PaymentMethodValidator;
+import fr.iut_fbleau.but3.dev62.mylibrary.subscription.validator.SubscriptionValidator;
+
+import java.util.*;
+
+public class SubscriptionUseCase {
+
+    private final SubscriptionRepository subscriptionRepository;
+
+    public SubscriptionUseCase(SubscriptionRepository subscriptionRepository) {
+
+        this.subscriptionRepository = subscriptionRepository;
+    }
+
+    private Map<String, Object> Output(Subscription subscription){
+        Map<String, Object> result = new HashMap<>();
+
+        result.put("subscriptionId", subscription.getSubscriptionId());
+        result.put("startDate", subscription.getStartDate());
+        result.put("endDate", subscription.getEndDate());
+        result.put("monthlyAmount", subscription.getMonthlyAmount());
+
+        return result;
+    }
+
+    public Map<String, Object> registerSubscription(SubscriptionInfo newSubscription, PaymentMethodInfo newPaymentMethod)
+            throws NotValidSubscriptionException {
+        SubscriptionValidator.validate(newSubscription);
+        PaymentMethodValidator.validate(newPaymentMethod);
+        Subscription subscriptionToRegister = SubscriptionConverter.toDomain(newSubscription, newPaymentMethod);
+        Subscription subscriptionToRegistered = subscriptionRepository.save(subscriptionToRegister);
+        return Output(subscriptionToRegistered);
+    }
+
+    public List<SubscriptionDTO> findSubscriptionByCustomerId(UUID customerId) {
+        List<Subscription> optionalSubscriptions = subscriptionRepository.FindByCustomerId(customerId);
+        return optionalSubscriptions.stream()
+                .map(SubscriptionConverter::toDTO)
+                .toList();
+    }
+
+    public Optional<SubscriptionDTO> findSubscriptionBySubscriptionId(UUID subscriptionId) {
+        Optional<Subscription> optionalSubscription = subscriptionRepository.findBySubscriptionId(subscriptionId);
+        return optionalSubscription.map(SubscriptionConverter::toDTO);
+    }
+
+    public SubscriptionDTO updateSubscription(UUID SubscriptionUUID, SubscriptionInfo subscriptionInfo, PaymentMethodInfo paymentMethodInfo)
+            throws SubscriptionNotFoundException, NotValidSubscriptionException {
+        SubscriptionValidator.validate(subscriptionInfo);
+        PaymentMethodValidator.validate(paymentMethodInfo);
+        Subscription subscriptionBySubscriptionUUID = getSubscriptionIfDoesNotExistThrowSubscriptionNotFoundException(
+                SubscriptionUUID);
+        PaymentMethod paymentMethod = PaymentMethod.builder()
+                .paymentType(paymentMethodInfo.paymentType())
+                .details(paymentMethodInfo.details())
+                .build();
+        Subscription subscription = Subscription.builder()
+                .subscriptionId(SubscriptionUUID)
+                .customerId(subscriptionBySubscriptionUUID.getCustomerId())
+                .desiredSubscriptionDuration(subscriptionInfo.desiredSubscriptionDuration())
+                .paymentMethod(paymentMethod)
+                .desiredStartDate(subscriptionInfo.desiredStartDate())
+                .monthlyAmount(subscriptionBySubscriptionUUID.getMonthlyAmount())
+                .build();
+        subscription.setDateSubscription();
+        Subscription updatedSubscription = subscriptionRepository.save(subscription);
+        return SubscriptionConverter.toDTO(updatedSubscription);
+    }
+
+    public void deleteSubscription(UUID subscriptionUUID) throws SubscriptionNotFoundException {
+        Subscription subscriptionToDelete = getSubscriptionIfDoesNotExistThrowSubscriptionNotFoundException(subscriptionUUID);
+        this.subscriptionRepository.delete(subscriptionToDelete);
+    }
+
+    public void deleteSubscriptionsOfACustomer(UUID customerUUID) throws SubscriptionNotFoundException {
+        List<Subscription> subscriptionsToDelete = getSubscriptionByCustomerIdIfDoesNotExistThrowSubscriptionNotFoundException(customerUUID);
+        for (Subscription subscription : subscriptionsToDelete) {
+            subscriptionRepository.delete(subscription);
+        }
+    }
+
+    private Subscription getSubscriptionIfDoesNotExistThrowSubscriptionNotFoundException(UUID subscriptionUUID)
+            throws SubscriptionNotFoundException {
+        Optional<Subscription> optionalSubscriptionBySubscriptionId = subscriptionRepository.findBySubscriptionId(subscriptionUUID);
+        if (optionalSubscriptionBySubscriptionId.isEmpty()) {
+            throw new SubscriptionNotFoundException(Optional.empty(),Optional.of(subscriptionUUID));
+        }
+        return optionalSubscriptionBySubscriptionId.get();
+    }
+
+    private List<Subscription> getSubscriptionByCustomerIdIfDoesNotExistThrowSubscriptionNotFoundException(UUID customerUUID)
+            throws SubscriptionNotFoundException {
+        List<Subscription> optionalSubscriptionBySubscriptionId = subscriptionRepository.FindByCustomerId(customerUUID);
+        if (optionalSubscriptionBySubscriptionId.isEmpty()) {
+            throw new SubscriptionNotFoundException(Optional.of(customerUUID),Optional.empty());
+        }
+        return optionalSubscriptionBySubscriptionId;
+    }
+}

src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/subscription/exception/SubscriptionNotFoundExceptionTest.java

@@ -0,0 +1,74 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.subscription.exception;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.util.Optional;
+import java.util.UUID;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class SubscriptionNotFoundExceptionTest {
+
+    @Test
+    @DisplayName("Exception message should contain the UUID provided for customer")
+    void testExceptionMessageContainsUUIDForCustomer() {
+        UUID customerUUID = UUID.randomUUID();
+
+        SubscriptionNotFoundException exception = new SubscriptionNotFoundException(Optional.of(customerUUID), Optional.empty());
+
+        String expectedMessage = String.format("The subscriptions with the customer id %s does not exists", customerUUID);
+        assertEquals(expectedMessage, exception.getMessage());
+    }
+
+    @Test
+    @DisplayName("Exception message should contain the UUID provided for subscription")
+    void testExceptionMessageContainsUUIDForSubscription() {
+        UUID subscriptionUUID = UUID.randomUUID();
+
+        SubscriptionNotFoundException exception = new SubscriptionNotFoundException(Optional.empty(), Optional.of(subscriptionUUID));
+
+        String expectedMessage = String.format("The subscription with subscription id %s does not exists", subscriptionUUID);
+        assertEquals(expectedMessage, exception.getMessage());
+    }
+
+    @Test
+    @DisplayName("Exception should use the correct constant message format for customer")
+    void testExceptionUsesConstantMessageCustomerFormat() {
+        UUID customerUUID = UUID.randomUUID();
+
+        SubscriptionNotFoundException exception = new SubscriptionNotFoundException(Optional.of(customerUUID), Optional.empty());
+
+        String expectedFormatWithPlaceholder = "The subscriptions with the customer id {0} does not exists";
+        assertEquals(SubscriptionNotFoundException.THE_SUBSCRIPTION_WITH_CUSTOMER_ID_DOES_NOT_EXIST_MESSAGE,
+                expectedFormatWithPlaceholder);
+        assertTrue(exception.getMessage().contains(customerUUID.toString()));
+    }
+
+    @Test
+    @DisplayName("Exception should use the correct constant message format for subscription")
+    void testExceptionUsesConstantMessageSubscriptionFormat() {
+        UUID subscriptionUUID = UUID.randomUUID();
+
+        SubscriptionNotFoundException exception = new SubscriptionNotFoundException(Optional.empty(), Optional.of(subscriptionUUID));
+
+        String expectedFormatWithPlaceholder = "The subscription with subscription id {0} does not exists";
+        assertEquals(SubscriptionNotFoundException.THE_SUBSCRIPTION_WITH_SUBSCRIPTION_ID_DOES_NOT_EXIST_MESSAGE,
+                expectedFormatWithPlaceholder);
+        assertTrue(exception.getMessage().contains(subscriptionUUID.toString()));
+    }
+
+    @Test
+    @DisplayName("Exception should be properly thrown and caught")
+    void testExceptionCanBeThrownAndCaught() {
+        UUID subscriptionUUID = UUID.randomUUID();
+
+        try {
+            throw new SubscriptionNotFoundException(Optional.empty(), Optional.of(subscriptionUUID));
+        } catch (SubscriptionNotFoundException e) {
+            String expectedMessage = String.format("The subscription with subscription id %s does not exists", subscriptionUUID);
+            assertEquals(expectedMessage, e.getMessage());
+        }
+    }
+}

src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/subscription/repository/SubscriptionRepositoryTest.java

@@ -2,7 +2,6 @@ package fr.iut_fbleau.but3.dev62.mylibrary.subscription.repository;
 
 import fr.iut_fbleau.but3.dev62.mylibrary.subscription.DesiredSubscriptionDuration;
 import fr.iut_fbleau.but3.dev62.mylibrary.subscription.PaymentType;
-import fr.iut_fbleau.but3.dev62.mylibrary.subscription.SubscriptionRepository;
 import fr.iut_fbleau.but3.dev62.mylibrary.subscription.entity.PaymentMethod;
 import fr.iut_fbleau.but3.dev62.mylibrary.subscription.entity.Subscription;
 import org.junit.jupiter.api.BeforeEach;

src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/subscription/usecase/SubscriptionUseCaseTest.java

@@ -0,0 +1,273 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.subscription.usecase;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.review.exception.NotValidReviewException;
+import fr.iut_fbleau.but3.dev62.mylibrary.subscription.*;
+import fr.iut_fbleau.but3.dev62.mylibrary.subscription.entity.PaymentMethod;
+import fr.iut_fbleau.but3.dev62.mylibrary.subscription.entity.Subscription;
+import fr.iut_fbleau.but3.dev62.mylibrary.subscription.exception.NotValidSubscriptionException;
+import fr.iut_fbleau.but3.dev62.mylibrary.subscription.exception.SubscriptionNotFoundException;
+import fr.iut_fbleau.but3.dev62.mylibrary.subscription.repository.SubscriptionRepository;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.time.LocalDate;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.UUID;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.*;
+import static org.mockito.Mockito.never;
+
+@ExtendWith(MockitoExtension.class)
+public class SubscriptionUseCaseTest {
+
+    @Mock
+    private SubscriptionRepository subscriptionRepository;
+
+    @InjectMocks
+    private SubscriptionUseCase subscriptionUseCase;
+
+    private UUID subscriptionId;
+    private UUID customerId;
+    private Integer desiredSubscriptionDuration;
+    private PaymentMethod paymentMethod;
+    private LocalDate desiredStartDate;
+    private double monthlyAmount;
+    private Subscription testSubscription;
+    private SubscriptionInfo validSubscriptionInfo;
+    private PaymentMethodInfo validPaymentMethodInfo;
+
+    @BeforeEach
+    void setUp() {
+        subscriptionId = UUID.randomUUID();
+        customerId = UUID.randomUUID();
+        desiredSubscriptionDuration = DesiredSubscriptionDuration.THREE.getValue();
+        desiredStartDate = LocalDate.of(2026, 6, 24);
+        paymentMethod = PaymentMethod.builder()
+                .paymentType(PaymentType.CB.name())
+                .details("Maxime Lebreton")
+                .build();
+        monthlyAmount = 12.99;
+
+        testSubscription = Subscription.builder()
+                .subscriptionId(subscriptionId)
+                .customerId(customerId)
+                .desiredSubscriptionDuration(desiredSubscriptionDuration)
+                .paymentMethod(paymentMethod)
+                .desiredStartDate(desiredStartDate)
+                .monthlyAmount(monthlyAmount)
+                .build();
+
+        validPaymentMethodInfo = new PaymentMethodInfo(PaymentType.PAYPAL.name(),"");
+        validSubscriptionInfo = new SubscriptionInfo(desiredSubscriptionDuration, desiredStartDate);
+    }
+
+    @Nested
+    @DisplayName("Register subscription tests")
+    class RegisterSubscriptionTests {
+
+        @Test
+        @DisplayName("Should register review when valid data is provided")
+        void testRegisterSubscriptionithValidData() throws NotValidSubscriptionException {
+            when(subscriptionRepository.save(any(Subscription.class))).thenReturn(testSubscription);
+
+            Map<String, Object> registeredSubscription = subscriptionUseCase.registerSubscription(validSubscriptionInfo, validPaymentMethodInfo);
+
+            assertNotNull(registeredSubscription);
+            assertEquals(subscriptionId, (UUID) registeredSubscription.get("subscriptionId"));
+            verify(subscriptionRepository, times(1)).save(any(Subscription.class));
+        }
+
+        @Test
+        @DisplayName("Should throw exception when review data is not valid")
+        void testRegisterSubscriptionWithInvalidData() {
+            PaymentMethodInfo invalidPaymentMethodInfo = new PaymentMethodInfo("carte","");
+            SubscriptionInfo invalidSubscriptionInfo = new SubscriptionInfo(0, desiredStartDate);
+
+            assertThrows(NotValidSubscriptionException.class,
+                    () -> subscriptionUseCase.registerSubscription(invalidSubscriptionInfo, invalidPaymentMethodInfo));
+
+            verify(subscriptionRepository, never()).save(any(Subscription.class));
+        }
+    }
+
+    @Nested
+    @DisplayName("Find subscription tests")
+    class FindSubscriptionTests {
+
+        @Test
+        @DisplayName("Should return reviews when customer ID exists")
+        void testFindSubscriptionByCustomerId() {
+            when(subscriptionRepository.FindByCustomerId(customerId)).thenReturn(List.of(testSubscription));
+
+            List<SubscriptionDTO> foundSubscriptions = subscriptionUseCase.findSubscriptionByCustomerId(customerId);
+
+            assertFalse(foundSubscriptions.isEmpty());
+            boolean allSameCustomer = foundSubscriptions.stream()
+                    .allMatch(review -> review.getCustomerId().equals(customerId));
+            assertTrue(allSameCustomer);
+            verify(subscriptionRepository, times(1)).FindByCustomerId(customerId);
+        }
+
+        @Test
+        @DisplayName("Should return empty Optional when customer ID doesn't exist")
+        void testFindSubscriptionByCustomerIdNotFound() {
+            UUID nonExistentCustomerId = UUID.randomUUID();
+            when(subscriptionRepository.FindByCustomerId(nonExistentCustomerId)).thenReturn(List.of());
+
+            List<SubscriptionDTO> foundSubscriptions = subscriptionUseCase.findSubscriptionByCustomerId(nonExistentCustomerId);
+
+            assertTrue(foundSubscriptions.isEmpty());
+            verify(subscriptionRepository, times(1)).FindByCustomerId(nonExistentCustomerId);
+        }
+
+        @Test
+        @DisplayName("Should return subscription when Subscription ID exists")
+        void testFindSubscriptionBySubscriptionId() {
+            when(subscriptionRepository.findBySubscriptionId(subscriptionId)).thenReturn(Optional.of(testSubscription));
+
+            Optional<SubscriptionDTO> foundSubscription = subscriptionUseCase.findSubscriptionBySubscriptionId(subscriptionId);
+
+            assertTrue(foundSubscription.isPresent());
+            assertEquals(testSubscription.getCustomerId(), foundSubscription.get().getCustomerId());
+            assertEquals(testSubscription.getMonthlyAmount(), foundSubscription.get().getMonthlyAmount());
+            verify(subscriptionRepository, times(1)).findBySubscriptionId(subscriptionId);
+        }
+
+        @Test
+        @DisplayName("Should return empty Optional when subscription ID doesn't exist")
+        void testFindSubscriptionBySubscriptionIdNotFound() {
+            UUID nonExistentSubscriptionId = UUID.randomUUID();
+            when(subscriptionRepository.findBySubscriptionId(nonExistentSubscriptionId)).thenReturn(Optional.empty());
+
+            Optional<SubscriptionDTO> foundSubscription = subscriptionUseCase.findSubscriptionBySubscriptionId(nonExistentSubscriptionId);
+
+            assertTrue(foundSubscription.isEmpty());
+            verify(subscriptionRepository, times(1)).findBySubscriptionId(nonExistentSubscriptionId);
+        }
+    }
+
+    @Nested
+    @DisplayName("Update subscription tests")
+    class UpdateSubscriptionTests {
+
+        @Test
+        @DisplayName("Should update subscription when valid data is provided")
+        void testUpdateSubscriptionWithValidData() throws SubscriptionNotFoundException, NotValidReviewException {
+            when(subscriptionRepository.findBySubscriptionId(subscriptionId)).thenReturn(Optional.of(testSubscription));
+
+            LocalDate updateDdesiredStartDate = LocalDate.of(2026, 6, 24);
+            Subscription updatedSubscription = Subscription.builder()
+                    .subscriptionId(subscriptionId)
+                    .customerId(customerId)
+                    .desiredSubscriptionDuration(desiredSubscriptionDuration)
+                    .paymentMethod(paymentMethod)
+                    .desiredStartDate(desiredStartDate)
+                    .monthlyAmount(monthlyAmount)
+                    .build();
+
+            when(subscriptionRepository.save(any(Subscription.class))).thenReturn(updatedSubscription);
+
+            SubscriptionInfo updateInfo = new SubscriptionInfo(DesiredSubscriptionDuration.SIX.getValue(), updateDdesiredStartDate);
+
+            SubscriptionDTO result = subscriptionUseCase.updateSubscription(subscriptionId, updateInfo, validPaymentMethodInfo);
+
+            assertNotNull(result);
+            assertEquals(customerId, result.getCustomerId());
+            assertEquals(monthlyAmount, result.getMonthlyAmount());
+            verify(subscriptionRepository, times(1)).findBySubscriptionId(subscriptionId);
+            verify(subscriptionRepository, times(1)).save(any(Subscription.class));
+        }
+
+        @Test
+        @DisplayName("Should throw exception when subscription ID doesn't exist")
+        void testUpdateSubscriptionNotFound() {
+            UUID nonExistentSubscriptionId = UUID.randomUUID();
+            when(subscriptionRepository.findBySubscriptionId(nonExistentSubscriptionId)).thenReturn(Optional.empty());
+
+            SubscriptionInfo updateInfo = new SubscriptionInfo(desiredSubscriptionDuration, desiredStartDate);
+
+            assertThrows(SubscriptionNotFoundException.class,
+                    () -> subscriptionUseCase.updateSubscription(nonExistentSubscriptionId, updateInfo, validPaymentMethodInfo));
+
+            verify(subscriptionRepository, times(1)).findBySubscriptionId(nonExistentSubscriptionId);
+            verify(subscriptionRepository, never()).save(any(Subscription.class));
+        }
+
+        @Test
+        @DisplayName("Should throw exception when update data is not valid")
+        void testUpdateSubscriptionWithInvalidData() {
+            SubscriptionInfo invalidUpdateInfo = new SubscriptionInfo(0, desiredStartDate);
+
+            assertThrows(NotValidSubscriptionException.class,
+                    () -> subscriptionUseCase.updateSubscription(subscriptionId, invalidUpdateInfo, validPaymentMethodInfo));
+
+            verify(subscriptionRepository, never()).findBySubscriptionId(any(UUID.class));
+            verify(subscriptionRepository, never()).save(any(Subscription.class));
+        }
+    }
+
+    @Nested
+    @DisplayName("Delete subscription tests")
+    class DeleteSubscriptionTests {
+
+        @Test
+        @DisplayName("Should delete subscriptions when customer ID exists")
+        void testDeleteSubscriptionsOfACustomer() throws SubscriptionNotFoundException {
+            when(subscriptionRepository.FindByCustomerId(customerId)).thenReturn(List.of(testSubscription));
+            doNothing().when(subscriptionRepository).delete(testSubscription);
+
+            subscriptionUseCase.deleteSubscriptionsOfACustomer(customerId);
+
+            verify(subscriptionRepository, times(1)).FindByCustomerId(customerId);
+            verify(subscriptionRepository, times(1)).delete(testSubscription);
+        }
+
+        @Test
+        @DisplayName("Should throw exception when customer ID doesn't exist")
+        void testDeleteSubscriptionsOfACustomerNotFound() {
+            UUID nonExistentCustomerId = UUID.randomUUID();
+            when(subscriptionRepository.FindByCustomerId(nonExistentCustomerId)).thenReturn(List.of());
+
+            assertThrows(SubscriptionNotFoundException.class,
+                    () -> subscriptionUseCase.deleteSubscriptionsOfACustomer(nonExistentCustomerId));
+
+            verify(subscriptionRepository, times(1)).FindByCustomerId(nonExistentCustomerId);
+            verify(subscriptionRepository, never()).delete(any(Subscription.class));
+        }
+
+        @Test
+        @DisplayName("Should delete subscription when subscription ID exist")
+        void testDeleteSubscription() throws SubscriptionNotFoundException {
+            when(subscriptionRepository.findBySubscriptionId(subscriptionId)).thenReturn(Optional.of(testSubscription));
+            doNothing().when(subscriptionRepository).delete(testSubscription);
+
+            subscriptionUseCase.deleteSubscription(subscriptionId);
+
+            verify(subscriptionRepository, times(1)).findBySubscriptionId(subscriptionId);
+            verify(subscriptionRepository, times(1)).delete(testSubscription);
+        }
+
+        @Test
+        @DisplayName("Should throw exception when subscription ID doesn't exist")
+        void testDeleteSubscriptionNotFound() {
+            UUID nonExistentSubscriptionId = UUID.randomUUID();
+            when(subscriptionRepository.findBySubscriptionId(nonExistentSubscriptionId)).thenReturn(Optional.empty());
+
+            assertThrows(SubscriptionNotFoundException.class,
+                    () -> subscriptionUseCase.deleteSubscription(nonExistentSubscriptionId));
+
+            verify(subscriptionRepository, times(1)).findBySubscriptionId(nonExistentSubscriptionId);
+            verify(subscriptionRepository, never()).delete(any(Subscription.class));
+        }
+    }
+}