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  package org.apache.cayenne;
  
  import org.apache.cayenne.di.Inject;
  import org.apache.cayenne.test.jdbc.DBHelper;
  import org.apache.cayenne.test.jdbc.TableHelper;
  import org.apache.cayenne.testdo.map_to_many.MapToMany;
  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 java.util.ArrayList;
  import java.util.Map;
  
  import static org.junit.Assert.*;
  
  @UseCayenneRuntime(CayenneProjects.MAP_TO_MANY_PROJECT)
  public class CayennePersistentObjectSetToManyMapIT extends RuntimeCase {
  
      @Inject
      protected ObjectContext context;
  
      @Inject
      protected DBHelper dbHelper;
  
      protected TableHelper tMapToMany;
      protected TableHelper tMapToManyTarget;
      protected TableHelper tIdMapToMany;
      protected TableHelper tIdMapToManyTarget;
  
      @Before
      public void setUp() throws Exception {
          tMapToMany = new TableHelper(dbHelper, "MAP_TO_MANY");
          tMapToMany.setColumns("ID");
  
          tMapToManyTarget = new TableHelper(dbHelper, "MAP_TO_MANY_TARGET");
          tMapToManyTarget.setColumns("ID", "MAP_TO_MANY_ID", "NAME");
  
          tIdMapToMany = new TableHelper(dbHelper, "ID_MAP_TO_MANY");
          tIdMapToMany.setColumns("ID");
  
          tIdMapToManyTarget = new TableHelper(dbHelper, "ID_MAP_TO_MANY_TARGET");
          tIdMapToManyTarget.setColumns("ID", "MAP_TO_MANY_ID");
  
          createTestDataSet();
      }
  
      protected void createTestDataSet() throws Exception {
          tMapToMany.insert(1);
          tMapToMany.insert(2);
          tMapToManyTarget.insert(1, 1, "A");
          tMapToManyTarget.insert(2, 1, "B");
          tMapToManyTarget.insert(3, 1, "C");
          tMapToManyTarget.insert(4, 2, "A");
      }
  
      /**
       * Testing if collection type is map, everything should work fine without a runtime exception
       */
      @Test
      public void testRelationCollectionTypeMap() {
          MapToMany o1 = Cayenne.objectForPK(context, MapToMany.class, 1);
          assertTrue(o1.readProperty(MapToMany.TARGETS.getName()) instanceof Map);
          try {
              o1.setToManyTarget(MapToMany.TARGETS.getName(), new ArrayList<MapToMany>(0), true);
          } catch (RuntimeException e) {
              fail();
          }
          assertEquals(0, o1.getTargets().size(), 0);
      }
  }