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  package org.apache.cayenne.dbsync.reverse.dbimport;
  
  import org.apache.cayenne.configuration.ConfigurationNameMapper;
  import org.apache.cayenne.configuration.ConfigurationTree;
  import org.apache.cayenne.configuration.DataChannelDescriptor;
  import org.apache.cayenne.configuration.DataMapLoader;
  import org.apache.cayenne.configuration.DefaultConfigurationNameMapper;
  import org.apache.cayenne.configuration.xml.DataChannelMetaData;
  import org.apache.cayenne.configuration.xml.DefaultHandlerFactory;
  import org.apache.cayenne.configuration.xml.HandlerFactory;
  import org.apache.cayenne.configuration.xml.NoopDataChannelMetaData;
  import org.apache.cayenne.configuration.xml.XMLDataChannelDescriptorLoader;
  import org.apache.cayenne.configuration.xml.XMLDataMapLoader;
  import org.apache.cayenne.configuration.xml.XMLReaderProvider;
  import org.apache.cayenne.dbsync.naming.DefaultObjectNameGenerator;
  import org.apache.cayenne.dbsync.naming.NoStemStemmer;
  import org.apache.cayenne.di.AdhocObjectFactory;
  import org.apache.cayenne.di.ClassLoaderManager;
  import org.apache.cayenne.di.DIBootstrap;
  import org.apache.cayenne.di.Injector;
  import org.apache.cayenne.di.Module;
  import org.apache.cayenne.di.spi.DefaultAdhocObjectFactory;
  import org.apache.cayenne.di.spi.DefaultClassLoaderManager;
  import org.apache.cayenne.map.DataMap;
  import org.apache.cayenne.map.ObjEntity;
  import org.apache.cayenne.resource.URLResource;
  import org.junit.Before;
  import org.junit.Test;
  import org.xml.sax.XMLReader;
  
  import java.net.URL;
  import java.util.ArrayList;
  
  import static org.junit.Assert.*;
  
  public class ManyToManyCandidateEntityTest {
  
      private DataMap map;
  
      @Before
      public void setUp() throws Exception {
          Module testModule = binder -> {
              binder.bind(ClassLoaderManager.class).to(DefaultClassLoaderManager.class);
              binder.bind(AdhocObjectFactory.class).to(DefaultAdhocObjectFactory.class);
              binder.bind(DataMapLoader.class).to(XMLDataMapLoader.class);
              binder.bind(ConfigurationNameMapper.class).to(DefaultConfigurationNameMapper.class);
              binder.bind(HandlerFactory.class).to(DefaultHandlerFactory.class);
              binder.bind(DataChannelMetaData.class).to(NoopDataChannelMetaData.class);
              binder.bind(XMLReader.class).toProviderInstance(new XMLReaderProvider(false)).withoutScope();
          };
  
          Injector injector = DIBootstrap.createInjector(testModule);
  
          // create and initialize loader instance to test
          XMLDataChannelDescriptorLoader loader = new XMLDataChannelDescriptorLoader();
          injector.injectMembers(loader);
  
          String testConfigName = "relationship-optimisation";
          URL url = getClass().getResource("cayenne-" + testConfigName + ".xml");
  
          ConfigurationTree<DataChannelDescriptor> tree = loader.load(new URLResource(url));
  
          map = tree.getRootNode().getDataMap(testConfigName);
      }
  
      @Test
      public void testMatchingForManyToManyEntity() {
          ObjEntity manyToManyEntity = map.getObjEntity("Table1Table2");
  
          assertNotNull(ManyToManyCandidateEntity.build(manyToManyEntity));
      }
  
      @Test
      public void testMatchingForNotManyToManyEntity() {
          ObjEntity entity = map.getObjEntity("Table1");
  
          assertNull(ManyToManyCandidateEntity.build(entity));
      }
  
      @Test
      public void testOptimisationForManyToManyEntity() {
          ObjEntity manyToManyEntity = map.getObjEntity("Table1Table2");
  
          ManyToManyCandidateEntity.build(manyToManyEntity)
                  .optimizeRelationships(new DefaultObjectNameGenerator(NoStemStemmer.getInstance()));
  
          ObjEntity table1Entity = map.getObjEntity("Table1");
          ObjEntity table2Entity = map.getObjEntity("Table2");
  
          assertEquals(1, table1Entity.getRelationships().size());
          assertEquals(table2Entity, new ArrayList<>(table1Entity.getRelationships()).get(0).getTargetEntity());
  
          assertEquals(1, table2Entity.getRelationships().size());
          assertEquals(table1Entity, new ArrayList<>(table2Entity.getRelationships()).get(0).getTargetEntity());
      }
  
  }
  