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  package org.apache.cayenne.ashwood;
  
  import java.util.Arrays;
  import java.util.List;
  
  import org.apache.cayenne.ObjectContext;
  import org.apache.cayenne.di.Inject;
  import org.apache.cayenne.map.DbEntity;
  import org.apache.cayenne.map.EntityResolver;
  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.Before;
  import org.junit.Test;
  
  import static org.junit.Assert.assertEquals;
  
  @UseCayenneRuntime(CayenneProjects.WEIGHTED_SORT_PROJECT)
  public class WeightedAshwoodEntitySorterIT extends RuntimeCase {
  
      @Inject
      protected ObjectContext context;
  
      EntityResolver resolver;
  
      @Before
      public void setUp() throws Exception {
          this.resolver = context.getEntityResolver();
      }
  
      @Test
      public void testSortDbEntities() {
          // since it is impossible to ensure non-coincidental sort order of unrelated
          // DbEntities (without overriding DbEntity.hashCode()), we'll test on 2 entities
          // with a relationship, and reverse the topological order with SortWeight annotation.
  
          List<DbEntity> eSorted = Arrays.asList(resolver.getDbEntity("SORT_DEP"), resolver.getDbEntity("SORT_ROOT"));
  
          List<DbEntity> e1 = Arrays.asList(resolver.getDbEntity("SORT_ROOT"), resolver.getDbEntity("SORT_DEP"));
  
          List<DbEntity> e2 = Arrays.asList(resolver.getDbEntity("SORT_DEP"), resolver.getDbEntity("SORT_ROOT"));
  
          WeightedAshwoodEntitySorter sorter = new WeightedAshwoodEntitySorter();
          sorter.setEntityResolver(resolver);
  
          sorter.sortDbEntities(e1, false);
          assertEquals(eSorted, e1);
  
          sorter.sortDbEntities(e2, false);
          assertEquals(eSorted, e2);
      }
  }
  