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  package org.apache.cayenne.access.translator.select;
  
  import org.apache.cayenne.access.jdbc.ColumnDescriptor;
  import org.apache.cayenne.access.sqlbuilder.sqltree.EmptyNode;
  import org.apache.cayenne.exp.path.CayennePath;
  import org.apache.cayenne.exp.property.PropertyFactory;
  import org.junit.Test;
  
  import static org.junit.Assert.*;
  
  /**
   * @since 4.2
   */
  public class ColumnDescriptorStageTest {
  
      @Test
      public void perform() {
          TranslatableQueryWrapper wrapper = new MockQueryWrapperBuilder()
                  .withDistinct(true)
                  .withMetaData(new MockQueryMetadataBuilder()
                          .withSuppressDistinct()
                          .build())
                  .build();
          TranslatorContext context = new MockTranslatorContext(wrapper);
  
          context.addResultNode(new EmptyNode());
          context.addResultNode(new EmptyNode(), CayennePath.of("key"));
          context.addResultNode(new EmptyNode(), false, PropertyFactory.COUNT, CayennePath.of("key2"));
  
          ColumnDescriptorStage stage = new ColumnDescriptorStage();
          stage.perform(context);
  
          assertEquals(1, context.getColumnDescriptors().size());
          ColumnDescriptor descriptor = context.getColumnDescriptors().iterator().next();
          assertEquals("key", descriptor.getDataRowKey());
      }
  }