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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.relationships_collection_to_many.CollectionToMany;
  import org.apache.cayenne.testdo.relationships_collection_to_many.CollectionToManyTarget;
  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.Collection;
  
  import static org.junit.Assert.*;
  
  @UseCayenneRuntime(CayenneProjects.RELATIONSHIPS_COLLECTION_TO_MANY_PROJECT)
  public class CayennePersistentObjectSetToManyCollectionIT extends RuntimeCase {
  
  	@Inject
  	private ObjectContext context;
  
  	@Inject
  	private DBHelper dbHelper;
  
  	@Before
  	public void setUp() throws Exception {
  		TableHelper tCollectionToMany = new TableHelper(dbHelper, "COLLECTION_TO_MANY");
  		tCollectionToMany.setColumns("ID");
  
  		TableHelper tCollectionToManyTarget = new TableHelper(dbHelper, "COLLECTION_TO_MANY_TARGET");
  		tCollectionToManyTarget.setColumns("ID", "COLLECTION_TO_MANY_ID");
  
  		// single data set for all tests
  		tCollectionToMany.insert(1).insert(2);
  		tCollectionToManyTarget.insert(1, 1).insert(2, 1).insert(3, 1).insert(4, 2);
  	}
  
  	@Test
  	public void testReadToMany() {
  
  		CollectionToMany o1 = Cayenne.objectForPK(context, CollectionToMany.class, 1);
  
  		Collection<?> targets = o1.getTargets();
  
  		assertNotNull(targets);
  		assertTrue(((ValueHolder) targets).isFault());
  
  		assertEquals(3, targets.size());
  
  		assertTrue(targets.contains(Cayenne.objectForPK(o1.getObjectContext(), CollectionToManyTarget.class, 1)));
  		assertTrue(targets.contains(Cayenne.objectForPK(o1.getObjectContext(), CollectionToManyTarget.class, 2)));
  		assertTrue(targets.contains(Cayenne.objectForPK(o1.getObjectContext(), CollectionToManyTarget.class, 3)));
  	}
  
  	/**
  	 * Testing if collection type is Collection, everything should work fine without a runtime exception
  	 */
  	@Test
  	public void testRelationCollectionTypeCollection() {
  		CollectionToMany o1 = Cayenne.objectForPK(context, CollectionToMany.class, 1);
  		assertTrue(o1.readProperty(CollectionToMany.TARGETS.getName()) instanceof Collection);
  		try {
  			o1.setToManyTarget(CollectionToMany.TARGETS.getName(), new ArrayList<CollectionToMany>(0), true);
  		} catch (RuntimeException e) {
  			fail();
  		}
  		assertEquals(0, o1.getTargets().size());
  	}
  }
  