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  package org.apache.cayenne.access.translator.select;
  
  import org.apache.cayenne.ObjectContext;
  import org.apache.cayenne.dba.DbAdapter;
  import org.apache.cayenne.di.Inject;
  import org.apache.cayenne.map.EntityResolver;
  import org.apache.cayenne.query.ObjectSelect;
  import org.apache.cayenne.reflect.ClassDescriptor;
  import org.apache.cayenne.testdo.testmap.CompoundPaintingLongNames;
  import org.apache.cayenne.unit.di.runtime.CayenneProjects;
  import org.apache.cayenne.unit.di.runtime.RuntimeCase;
  import org.apache.cayenne.unit.di.runtime.UseCayenneRuntime;
  import org.junit.Test;
  import org.mockito.Mockito;
  
  import java.util.List;
  import java.util.stream.Collectors;
  
  import static org.junit.Assert.assertEquals;
  
  @UseCayenneRuntime(CayenneProjects.TESTMAP_PROJECT)
  public class DescriptorColumnExtractorIT extends RuntimeCase {
      @Inject
      private ObjectContext context;
  
      private final List<String> expectedFlattenedDbFields = List.of(
              "toArtist.ARTIST_ID",
              "toArtist.ARTIST_NAME",
              "toGallery.GALLERY_ID",
              "toGallery.GALLERY_NAME",
              "toPaintingInfo.PAINTING_ID",
              "toPaintingInfo.TEXT_REVIEW");
  
      @Test
      public void testEntityResultAddDbFieldsForFlattenedAttributes() {
  
          EntityResolver resolver = context.getEntityResolver();
          ClassDescriptor classDescriptor = resolver.getClassDescriptor("CompoundPaintingLongNames");
  
          TranslatorContext translatorContext = new TranslatorContext(
                  new FluentSelectWrapper(ObjectSelect.query(CompoundPaintingLongNames.class)
                          .column(CompoundPaintingLongNames.SELF)),
                  Mockito.mock(DbAdapter.class),
                  resolver,
                  null);
  
          DescriptorColumnExtractor descriptor = new DescriptorColumnExtractor(translatorContext, classDescriptor);
          descriptor.extract();
  
          List<String> actualFlattenedDbFields = translatorContext.getRootEntityResult()
                  .getDbFields(resolver)
                  .keySet()
                  .stream()
                  .filter(key -> key.startsWith("to"))
                  .sorted()
                  .collect(Collectors.toList());
  
          assertEquals(expectedFlattenedDbFields.get(0), actualFlattenedDbFields.get(0));
          assertEquals(expectedFlattenedDbFields.get(1), actualFlattenedDbFields.get(1));
          assertEquals(expectedFlattenedDbFields.get(2), actualFlattenedDbFields.get(2));
          assertEquals(expectedFlattenedDbFields.get(3), actualFlattenedDbFields.get(3));
          assertEquals(expectedFlattenedDbFields.get(4), actualFlattenedDbFields.get(4));
          assertEquals(expectedFlattenedDbFields.get(5), actualFlattenedDbFields.get(5));
      }
  }