src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetController.java

@@ -12,15 +12,14 @@ import net.hostsharing.hsadminng.hs.hosting.generated.api.v1.model.HsHostingAsse
 import net.hostsharing.hsadminng.hs.hosting.generated.api.v1.model.HsHostingAssetTypeResource;
 import net.hostsharing.hsadminng.mapper.KeyValueMap;
 import net.hostsharing.hsadminng.mapper.Mapper;
+import net.hostsharing.hsadminng.persistence.EntityManagerWrapper;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.ResponseEntity;
 import org.springframework.transaction.annotation.Transactional;
 import org.springframework.web.bind.annotation.RestController;
 import org.springframework.web.servlet.mvc.method.annotation.MvcUriComponentsBuilder;
 
-import jakarta.persistence.EntityManager;
 import jakarta.persistence.EntityNotFoundException;
-import jakarta.persistence.PersistenceContext;
 import java.util.List;
 import java.util.Map;
 import java.util.UUID;
@@ -29,8 +28,8 @@ import java.util.function.BiConsumer;
 @RestController
 public class HsHostingAssetController implements HsHostingAssetsApi {
 
-    @PersistenceContext
+    @Autowired
-    private EntityManager em;
+    private EntityManagerWrapper emw;
 
     @Autowired
     private Context context;
@@ -75,7 +74,7 @@ public class HsHostingAssetController implements HsHostingAssetsApi {
 
         final var entity = mapper.map(body, HsHostingAssetRbacEntity.class, RESOURCE_TO_ENTITY_POSTMAPPER);
 
-        final var mapped = new HostingAssetEntitySaveProcessor(em, entity)
+        final var mapped = new HostingAssetEntitySaveProcessor(emw, entity)
                 .preprocessEntity()
                 .validateEntity()
                 .prepareForSave()
@@ -134,9 +133,9 @@ public class HsHostingAssetController implements HsHostingAssetsApi {
 
         final var entity = rbacAssetRepo.findByUuid(assetUuid).orElseThrow();
 
-        new HsHostingAssetEntityPatcher(em, entity).apply(body);
+        new HsHostingAssetEntityPatcher(emw, entity).apply(body);
 
-        final var mapped = new HostingAssetEntitySaveProcessor(em, entity)
+        final var mapped = new HostingAssetEntitySaveProcessor(emw, entity)
                 .preprocessEntity()
                 .validateEntity()
                 .prepareForSave()
@@ -165,5 +164,5 @@ public class HsHostingAssetController implements HsHostingAssetsApi {
     @SuppressWarnings("unchecked")
     final BiConsumer<HsHostingAssetRbacEntity, HsHostingAssetResource> ENTITY_TO_RESOURCE_POSTMAPPER = (entity, resource)
             -> resource.setConfig(HostingAssetEntityValidatorRegistry.forType(entity.getType())
-                .revampProperties(em, entity, (Map<String, Object>) resource.getConfig()));
+                .revampProperties(emw, entity, (Map<String, Object>) resource.getConfig()));
 }

src/main/java/net/hostsharing/hsadminng/hs/validation/ArrayProperty.java

@@ -26,6 +26,10 @@ public class ArrayProperty<P extends ValidatableProperty<?, E>, E> extends Valid
     }
 
     public static <T> ArrayProperty<?, T[]> arrayOf(final ValidatableProperty<?, T> elementsOf) {
+        if (elementsOf.type != String.class) {
+            // see also net.hostsharing.hsadminng.mapper.PatchableMapWrapper.fixValueType
+            throw new IllegalArgumentException("currently arrayOf(...) is only implemented for stringProperty(...)");
+        }
         //noinspection unchecked
         return (ArrayProperty<?, T[]>) new ArrayProperty<>(elementsOf);
     }

src/main/java/net/hostsharing/hsadminng/mapper/PatchableMapWrapper.java

@@ -6,6 +6,7 @@ import lombok.SneakyThrows;
 import org.apache.commons.lang3.tuple.ImmutablePair;
 
 import jakarta.validation.constraints.NotNull;
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashSet;
 import java.util.Map;
@@ -107,7 +108,7 @@ public class PatchableMapWrapper<T> implements Map<String, T> {
         if (!Objects.equals(value, delegate.get(key))) {
             patched.add(key);
         }
-        return delegate.put(key, value);
+        return delegate.put(key, fixValueType(value));
     }
 
     @Override
@@ -146,4 +147,15 @@ public class PatchableMapWrapper<T> implements Map<String, T> {
     public Set<Entry<String, T>> entrySet() {
         return delegate.entrySet();
     }
+
+    private T fixValueType(final T value) {
+        if (value instanceof ArrayList<?> arrayListValue) {
+            // Jackson deserialization creates ArrayList for JSON arrays, but we need a String[].
+            // Jackson could be configured to create Object[], but that does not help.
+            final var valueToPut = arrayListValue.stream().map(Object::toString).toArray(String[]::new);
+            //noinspection unchecked
+            return (T) valueToPut;
+        }
+        return value;
+    }
 }

src/main/java/net/hostsharing/hsadminng/persistence/EntityManagerWrapper.java

@@ -0,0 +1,300 @@
+package net.hostsharing.hsadminng.persistence;
+
+import lombok.AllArgsConstructor;
+import lombok.NoArgsConstructor;
+import org.springframework.stereotype.Component;
+
+import jakarta.persistence.EntityGraph;
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.EntityManagerFactory;
+import jakarta.persistence.EntityTransaction;
+import jakarta.persistence.FlushModeType;
+import jakarta.persistence.LockModeType;
+import jakarta.persistence.PersistenceContext;
+import jakarta.persistence.Query;
+import jakarta.persistence.StoredProcedureQuery;
+import jakarta.persistence.TypedQuery;
+import jakarta.persistence.criteria.CriteriaBuilder;
+import jakarta.persistence.criteria.CriteriaDelete;
+import jakarta.persistence.criteria.CriteriaQuery;
+import jakarta.persistence.criteria.CriteriaUpdate;
+import jakarta.persistence.metamodel.Metamodel;
+import java.util.List;
+import java.util.Map;
+
+/** A Spring bean wrapper for the EntityManager.
+ *
+ * <p>@PersistenceContext cannot be properly mocked in @WebMvcTest-based tests
+ * because Spring will always create a proxy for the mock which then fails because it has no active transaction.</p>
+ *
+ * <p>Also, @PersistenceContext cannot be used for constructor injection, though a bean factory would solve that problem.</p>
+ *
+ * <p>Use this wrapper **only** if needed for a @WebMvcTest with a mocked EntityManager, otherwise use the original EntityManager.</p>
+  */
+@Component
+@NoArgsConstructor
+@AllArgsConstructor
+public class EntityManagerWrapper implements EntityManager {
+
+    @PersistenceContext
+    EntityManager em;
+
+    @Override
+    public void persist(final Object entity) {
+        em.persist(entity);
+    }
+
+    @Override
+    public <T> T merge(final T entity) {
+        return em.merge(entity);
+    }
+
+    @Override
+    public void remove(final Object entity) {
+        em.remove(entity);
+    }
+
+    @Override
+    public <T> T find(final Class<T> entityClass, final Object primaryKey) {
+        return em.find(entityClass, primaryKey);
+    }
+
+    @Override
+    public <T> T find(final Class<T> entityClass, final Object primaryKey, final Map<String, Object> properties) {
+        return em.find(entityClass, primaryKey, properties);
+    }
+
+    @Override
+    public <T> T find(final Class<T> entityClass, final Object primaryKey, final LockModeType lockMode) {
+        return em.find(entityClass, primaryKey, lockMode);
+    }
+
+    @Override
+    public <T> T find(
+            final Class<T> entityClass,
+            final Object primaryKey,
+            final LockModeType lockMode,
+            final Map<String, Object> properties) {
+        return em.find(entityClass, primaryKey, lockMode, properties);
+    }
+
+    @Override
+    public <T> T getReference(final Class<T> entityClass, final Object primaryKey) {
+        return em.getReference(entityClass, primaryKey);
+    }
+
+    @Override
+    public void flush() {
+        em.flush();
+    }
+
+    @Override
+    public void setFlushMode(final FlushModeType flushMode) {
+        em.setFlushMode(flushMode);
+    }
+
+    @Override
+    public FlushModeType getFlushMode() {
+        return em.getFlushMode();
+    }
+
+    @Override
+    public void lock(final Object entity, final LockModeType lockMode) {
+        em.lock(entity, lockMode);
+    }
+
+    @Override
+    public void lock(final Object entity, final LockModeType lockMode, final Map<String, Object> properties) {
+        em.lock(entity, lockMode, properties);
+    }
+
+    @Override
+    public void refresh(final Object entity) {
+        em.refresh(entity);
+    }
+
+    @Override
+    public void refresh(final Object entity, final Map<String, Object> properties) {
+        em.refresh(entity, properties);
+    }
+
+    @Override
+    public void refresh(final Object entity, final LockModeType lockMode) {
+        em.refresh(entity, lockMode);
+    }
+
+    @Override
+    public void refresh(final Object entity, final LockModeType lockMode, final Map<String, Object> properties) {
+        em.refresh(entity, lockMode, properties);
+    }
+
+    @Override
+    public void clear() {
+        em.clear();
+    }
+
+    @Override
+    public void detach(final Object entity) {
+        em.detach(entity);
+    }
+
+    @Override
+    public boolean contains(final Object entity) {
+        return em.contains(entity);
+    }
+
+    @Override
+    public LockModeType getLockMode(final Object entity) {
+        return em.getLockMode(entity);
+    }
+
+    @Override
+    public void setProperty(final String propertyName, final Object value) {
+        em.setProperty(propertyName, value);
+    }
+
+    @Override
+    public Map<String, Object> getProperties() {
+        return em.getProperties();
+    }
+
+    @Override
+    public Query createQuery(final String qlString) {
+        return em.createQuery(qlString);
+    }
+
+    @Override
+    public <T> TypedQuery<T> createQuery(final CriteriaQuery<T> criteriaQuery) {
+        return em.createQuery(criteriaQuery);
+    }
+
+    @Override
+    public Query createQuery(final CriteriaUpdate updateQuery) {
+        return em.createQuery(updateQuery);
+    }
+
+    @Override
+    public Query createQuery(final CriteriaDelete deleteQuery) {
+        return em.createQuery(deleteQuery);
+    }
+
+    @Override
+    public <T> TypedQuery<T> createQuery(final String qlString, final Class<T> resultClass) {
+        return em.createQuery(qlString, resultClass);
+    }
+
+    @Override
+    public Query createNamedQuery(final String name) {
+        return em.createNamedQuery(name);
+    }
+
+    @Override
+    public <T> TypedQuery<T> createNamedQuery(final String name, final Class<T> resultClass) {
+        return em.createNamedQuery(name, resultClass);
+    }
+
+    @Override
+    public Query createNativeQuery(final String sqlString) {
+        return em.createNativeQuery(sqlString);
+    }
+
+    @Override
+    public Query createNativeQuery(final String sqlString, final Class resultClass) {
+        return em.createNativeQuery(sqlString, resultClass);
+    }
+
+    @Override
+    public Query createNativeQuery(final String sqlString, final String resultSetMapping) {
+        return em.createNativeQuery(sqlString, resultSetMapping);
+    }
+
+    @Override
+    public StoredProcedureQuery createNamedStoredProcedureQuery(final String name) {
+        return em.createNamedStoredProcedureQuery(name);
+    }
+
+    @Override
+    public StoredProcedureQuery createStoredProcedureQuery(final String procedureName) {
+        return em.createStoredProcedureQuery(procedureName);
+    }
+
+    @Override
+    public StoredProcedureQuery createStoredProcedureQuery(final String procedureName, final Class... resultClasses) {
+        return em.createStoredProcedureQuery(procedureName, resultClasses);
+    }
+
+    @Override
+    public StoredProcedureQuery createStoredProcedureQuery(final String procedureName, final String... resultSetMappings) {
+        return em.createStoredProcedureQuery(procedureName, resultSetMappings);
+    }
+
+    @Override
+    public void joinTransaction() {
+        em.joinTransaction();
+    }
+
+    @Override
+    public boolean isJoinedToTransaction() {
+        return em.isJoinedToTransaction();
+    }
+
+    @Override
+    public <T> T unwrap(final Class<T> cls) {
+        return em.unwrap(cls);
+    }
+
+    @Override
+    public Object getDelegate() {
+        return em.getDelegate();
+    }
+
+    @Override
+    public void close() {
+        em.close();
+    }
+
+    @Override
+    public boolean isOpen() {
+        return em.isOpen();
+    }
+
+    @Override
+    public EntityTransaction getTransaction() {
+        return em.getTransaction();
+    }
+
+    @Override
+    public EntityManagerFactory getEntityManagerFactory() {
+        return em.getEntityManagerFactory();
+    }
+
+    @Override
+    public CriteriaBuilder getCriteriaBuilder() {
+        return em.getCriteriaBuilder();
+    }
+
+    @Override
+    public Metamodel getMetamodel() {
+        return em.getMetamodel();
+    }
+
+    @Override
+    public <T> EntityGraph<T> createEntityGraph(final Class<T> rootType) {
+        return em.createEntityGraph(rootType);
+    }
+
+    @Override
+    public EntityGraph<?> createEntityGraph(final String graphName) {
+        return em.createEntityGraph(graphName);
+    }
+
+    @Override
+    public EntityGraph<?> getEntityGraph(final String graphName) {
+        return em.getEntityGraph(graphName);
+    }
+
+    @Override
+    public <T> List<EntityGraph<? super T>> getEntityGraphs(final Class<T> entityClass) {
+        return em.getEntityGraphs(entityClass);
+    }
+}

src/test/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetControllerRestTest.java

@@ -3,18 +3,22 @@ package net.hostsharing.hsadminng.hs.hosting.asset;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import lombok.SneakyThrows;
+import net.hostsharing.hsadminng.config.JsonObjectMapperConfiguration;
 import net.hostsharing.hsadminng.context.Context;
 import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemRealRepository;
 import net.hostsharing.hsadminng.mapper.Array;
 import net.hostsharing.hsadminng.mapper.Mapper;
+import net.hostsharing.hsadminng.persistence.EntityManagerWrapper;
 import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.EnumSource;
 import org.junit.runner.RunWith;
-import org.mockito.Mock;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
+import org.springframework.boot.test.context.TestConfiguration;
 import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Import;
 import org.springframework.http.MediaType;
 import org.springframework.test.context.junit4.SpringRunner;
@@ -24,8 +28,11 @@ import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
 import jakarta.persistence.EntityManager;
 import jakarta.persistence.EntityManagerFactory;
 import jakarta.persistence.SynchronizationType;
+import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
+import java.util.UUID;
 
 import static java.util.Map.entry;
 import static net.hostsharing.hsadminng.hs.booking.item.TestHsBookingItem.CLOUD_SERVER_BOOKING_ITEM_REAL_ENTITY;
@@ -36,12 +43,14 @@ import static net.hostsharing.hsadminng.hs.office.contact.HsOfficeContactRealTes
 import static net.hostsharing.hsadminng.rbac.test.JsonMatcher.lenientlyEquals;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.doNothing;
+import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
 
 @WebMvcTest(HsHostingAssetController.class)
-@Import(Mapper.class)
+@Import({Mapper.class, JsonObjectMapperConfiguration.class})
 @RunWith(SpringRunner.class)
 public class HsHostingAssetControllerRestTest {
 
@@ -54,8 +63,8 @@ public class HsHostingAssetControllerRestTest {
     @Autowired
     Mapper mapper;
 
-    @Mock
+    @MockBean
-    private EntityManager em;
+    private EntityManagerWrapper em;
 
     @MockBean
     EntityManagerFactory emf;
@@ -70,6 +79,15 @@ public class HsHostingAssetControllerRestTest {
     @MockBean
     private HsHostingAssetRbacRepository rbacAssetRepo;
 
+    @TestConfiguration
+    public static class TestConfig {
+
+        @Bean
+        public EntityManager entityManager() {
+            return mock(EntityManager.class);
+        }
+
+    }
     enum ListTestCases {
         CLOUD_SERVER(
                 List.of(
@@ -558,6 +576,7 @@ public class HsHostingAssetControllerRestTest {
         when(emf.createEntityManager(any(Map.class))).thenReturn(em);
         when(emf.createEntityManager(any(SynchronizationType.class))).thenReturn(em);
         when(emf.createEntityManager(any(SynchronizationType.class), any(Map.class))).thenReturn(em);
+//        doNothing().when(transactionManager).commit(any());
     }
 
     @ParameterizedTest
@@ -584,4 +603,115 @@ public class HsHostingAssetControllerRestTest {
             assertThat(resultBody.get(n).path("config")).isEqualTo(testCase.expectedConfig(n));
         }
     }
+
+    @Test
+    void shouldPatchAsset() throws Exception {
+        // given
+        final var givenDomainSetup = HsHostingAssetRealEntity.builder()
+                .type(HsHostingAssetType.DOMAIN_SETUP)
+                .identifier("example.org")
+                .caption("some fake Domain-Setup")
+                .build();
+        final var givenUnixUser = HsHostingAssetRealEntity.builder()
+                .type(HsHostingAssetType.UNIX_USER)
+                .parentAsset(MANAGED_WEBSPACE_HOSTING_ASSET_REAL_TEST_ENTITY)
+                .identifier("xyz00-office")
+                .caption("some fake Unix-User")
+                .config(Map.ofEntries(
+                        entry("password", "$6$salt$hashed-salted-password"),
+                        entry("totpKey", "0x0123456789abcdef"),
+                        entry("shell", "/bin/bash"),
+                        entry("SSD-soft-quota", 128),
+                        entry("SSD-hard-quota", 256),
+                        entry("HDD-soft-quota", 256),
+                        entry("HDD-hard-quota", 512)))
+                .build();
+        final var givenDomainHttpSetupUuid = UUID.randomUUID();
+        final var givenDomainHttpSetupHostingAsset = HsHostingAssetRbacEntity.builder()
+                .type(HsHostingAssetType.DOMAIN_HTTP_SETUP)
+                .identifier("example.org|HTTP")
+                .caption("some fake Domain-HTTP-Setup")
+                .parentAsset(givenDomainSetup)
+                .assignedToAsset(givenUnixUser)
+                .config(new HashMap<>(Map.ofEntries(
+                        entry("htdocsfallback", false),
+                        entry("indexes", false),
+                        entry("cgi", false),
+                        entry("passenger", false),
+                        entry("passenger-errorpage", true),
+                        entry("fastcgi", false),
+                        entry("autoconfig", false),
+                        entry("greylisting", false),
+                        entry("includes", false),
+                        entry("letsencrypt", false),
+                        entry("multiviews", false),
+                        entry("fcgi-php-bin", "/usr/lib/cgi-bin/php8"),
+                        entry("passenger-nodejs", "/usr/bin/node-js7"),
+                        entry("passenger-python", "/usr/bin/python6"),
+                        entry("passenger-ruby", "/usr/bin/ruby5"),
+                        entry("subdomains", Array.of("www", "test1", "test2"))
+                )))
+                .build();
+        when(rbacAssetRepo.findByUuid(givenDomainHttpSetupUuid)).thenReturn(Optional.of(givenDomainHttpSetupHostingAsset));
+        when(em.contains(givenDomainHttpSetupHostingAsset)).thenReturn(true);
+        doNothing().when(em).flush();
+
+        // when
+        final var result = mockMvc.perform(MockMvcRequestBuilders
+                        .patch("/api/hs/hosting/assets/" + givenDomainHttpSetupUuid)
+                        .header("current-user", "superuser-alex@hostsharing.net")
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content("""
+                        {
+                            "type": "DOMAIN_HTTP_SETUP",
+                            "identifier": "updated example.org|HTTP",
+                            "caption": "some updated fake Domain-HTTP-Setup",
+                            "alarmContact": null,
+                            "config": {
+                                "autoconfig": true,
+                                "multiviews": true,
+                                "passenger": false,
+                                "fcgi-php-bin": "/usr/lib/cgi-bin/php9",
+                                "subdomains": ["www","test"]
+                            }
+                        }
+                        """)
+                        .accept(MediaType.APPLICATION_JSON))
+
+                // then
+                .andExpect(status().is2xxSuccessful())
+                .andExpect(jsonPath("$", lenientlyEquals("""
+                        {
+                            "type": "DOMAIN_HTTP_SETUP",
+                            "identifier": "example.org|HTTP",
+                            "caption": "some updated fake Domain-HTTP-Setup",
+                            "alarmContact": null,
+                            "config": {
+                                "autoconfig": true,
+                                "cgi": false,
+                                "fastcgi": false,
+                                "greylisting": false,
+                                "htdocsfallback": false,
+                                "includes": false,
+                                "indexes": false,
+                                "letsencrypt": false,
+                                "multiviews": true,
+                                "passenger": false,
+                                "passenger-errorpage": true,
+                                "passenger-nodejs": "/usr/bin/node-js7",
+                                "passenger-python": "/usr/bin/python6",
+                                "passenger-ruby": "/usr/bin/ruby5",
+                                "fcgi-php-bin": "/usr/lib/cgi-bin/php9",
+                                "subdomains": ["www","test"]
+                            }
+                        }
+                        """)))
+                .andReturn();
+
+        // and the config properties do match not just leniently but even strictly
+        final var resultBody = new ObjectMapper().readTree(result.getResponse().getContentAsString());
+        for (int n = 0; n < resultBody.size(); ++n) {
+//            assertThat(resultBody.get(n).path("config")).isEqualTo(testCase.expectedConfig(n));
+        }
+    }
 }

src/test/java/net/hostsharing/hsadminng/persistence/EntityManagerWrapperUnitTest.java

@@ -0,0 +1,61 @@
+package net.hostsharing.hsadminng.persistence;
+
+import net.hostsharing.hsadminng.mapper.Array;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+import jakarta.persistence.EntityManager;
+
+import java.lang.reflect.Method;
+import java.util.Arrays;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+
+class EntityManagerWrapperUnitTest {
+    private EntityManagerWrapper wrapper;
+    private EntityManager delegateMock;
+
+    @BeforeEach
+    public void setUp() {
+        delegateMock = mock(EntityManager.class);
+        wrapper = new EntityManagerWrapper(delegateMock);
+    }
+
+    @Test
+    public void testAllMethodsAreForwarded() throws Exception {
+        final var methods = EntityManager.class.getMethods();
+
+        for (Method method : methods) {
+            // given prepared dummy arguments (if any)
+            final var args = Arrays.stream(method.getParameterTypes())
+                    .map(this::getDefaultValue)
+                    .toArray();
+
+            // when
+            method.invoke(wrapper, args);
+
+            // then verify that the same method was called on the mock delegate
+            Mockito.verify(delegateMock, times(1)).getClass()
+                    .getMethod(method.getName(), method.getParameterTypes())
+                    .invoke(delegateMock, args);
+        }
+    }
+
+    private Object getDefaultValue(Class<?> type) {
+        if (type == boolean.class) return false;
+        if (type == byte.class) return (byte) 0;
+        if (type == short.class) return (short) 0;
+        if (type == int.class) return 0;
+        if (type == long.class) return 0L;
+        if (type == float.class) return 0.0f;
+        if (type == double.class) return 0.0;
+        if (type == char.class) return '\0';
+        if (type == String.class) return "dummy";
+        if (type == String[].class) return Array.of("dummy");
+        if (type == Class.class) return String.class;
+        if (type == Class[].class) return Array.of(String.class);
+        return mock(type);
+    }
+}