added unit test

src/main/java/it/gov/pagopa/pu/organization/config/RepositoryRestCustomConfiguration.java

@@ -3,8 +3,10 @@
 import jakarta.persistence.EntityManager;
 import jakarta.persistence.metamodel.EntityType;
 import java.util.Set;
+import java.util.function.Consumer;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.data.rest.core.config.RepositoryRestConfiguration;
 import org.springframework.data.rest.webmvc.config.RepositoryRestConfigurer;
 
 @Configuration
@@ -16,12 +18,16 @@ public RepositoryRestCustomConfiguration(EntityManager entityManager){
   }
   @Bean
   public RepositoryRestConfigurer repositoryRestConfigurer() {
-    return RepositoryRestConfigurer.withConfig(config -> {
+    return RepositoryRestConfigurer.withConfig( config() );
+  }
+
+  Consumer<RepositoryRestConfiguration> config () {
+    return config -> {
       Set<EntityType<?>> entities = entityManager.getMetamodel().getEntities();
       config.exposeIdsFor(entities.stream()
         .map(EntityType::getJavaType)
         .toArray(Class[]::new));
-    });
+    };
   }
 
 }

src/test/java/it/gov/pagopa/pu/organization/config/RepositoryRestCustomConfigurationTest.java

@@ -0,0 +1,61 @@
+package it.gov.pagopa.pu.organization.config;
+
+import static org.mockito.Mockito.times;
+
+import it.gov.pagopa.pu.organization.model.Broker;
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.metamodel.EntityType;
+import jakarta.persistence.metamodel.Metamodel;
+import java.util.Collections;
+import java.util.function.Consumer;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.data.rest.core.config.RepositoryRestConfiguration;
+import org.springframework.data.rest.webmvc.config.RepositoryRestConfigurer;
+
+@ExtendWith(MockitoExtension.class)
+class RepositoryRestCustomConfigurationTest {
+
+  @Mock
+  private EntityManager entityManager;
+
+  @Mock
+  private Metamodel metamodel;
+
+  @Mock
+  private EntityType<?> entityType;
+
+  @InjectMocks
+  private RepositoryRestCustomConfiguration config;
+
+  @Test
+  void givenRepositoryRestConfigurerThenOk() {
+    // Act
+    RepositoryRestConfigurer configurer = config.repositoryRestConfigurer();
+
+    // Assert
+    Assertions.assertNotNull(configurer);
+  }
+
+  @Test
+  void givenCustomRepositoryRestConfigurationConfigurationThenOk() {
+    Mockito.when(entityManager.getMetamodel()).thenReturn(metamodel);
+    Mockito.when(metamodel.getEntities()).thenReturn(Collections.singleton(entityType));
+    Mockito.when(entityType.getJavaType()).thenReturn((Class) Broker.class);
+    // Act
+    Consumer<RepositoryRestConfiguration> consumer = config.config();
+
+    // Assert
+    Assertions.assertNotNull(consumer);
+    RepositoryRestConfiguration repositoryRestConfiguration = Mockito.mock(RepositoryRestConfiguration.class);
+    consumer.accept(repositoryRestConfiguration);
+    Mockito.verify(entityManager, times(1)).getMetamodel();
+    Mockito.verify(metamodel, times(1)).getEntities();
+    Mockito.verify(entityType, times(1)).getJavaType();
+  }
+}