code: package it.unibz.inf.ontop.docker.postgres;
  
  import com.google.common.collect.ImmutableList;
  import it.unibz.inf.ontop.docker.AbstractLeftJoinProfTest;
  import it.unibz.inf.ontop.owlapi.OntopOWLEngine;
  import it.unibz.inf.ontop.owlapi.connection.OntopOWLConnection;
  import it.unibz.inf.ontop.owlapi.connection.OntopOWLStatement;
  import org.junit.AfterClass;
  import org.junit.BeforeClass;
  import org.semanticweb.owlapi.model.OWLException;
  import org.semanticweb.owlapi.model.OWLOntologyCreationException;
  
  public class LeftJoinProfPgSQLTest extends AbstractLeftJoinProfTest {
  
      private static final String owlFileName = "/redundant_join/redundant_join_fk_test.owl";
      private static final String obdaFileName = "/redundant_join/redundant_join_fk_test.obda";
      private static final String propertyFileName = "/pgsql/redundant_join_fk_test.properties";
  
      private static OntopOWLEngine REASONER;
      private static OntopOWLConnection CONNECTION;
  
      @BeforeClass
      public static void before() throws OWLOntologyCreationException {
          REASONER = createReasoner(owlFileName, obdaFileName, propertyFileName);
          CONNECTION = REASONER.getConnection();
      }
  
      @Override
      protected OntopOWLStatement createStatement() throws OWLException {
          return CONNECTION.createStatement();
      }
  
      @AfterClass
      public static void after() throws Exception {
          CONNECTION.close();
          REASONER.close();
      }
  
      @Override
      protected ImmutableList<String> getExpectedValuesMultitypedAvg1() {
          return ImmutableList.of("15.5000000000000000", "16.0000000000000000", "19.2500000000000000");
      }
  
      @Override
      protected ImmutableList<String> getExpectedValuesAvgStudents1() {
          return  ImmutableList.of("11.2000000000000000");
      }
  
      @Override
      protected ImmutableList<String> getExpectedValuesAvgStudents2() {
          return ImmutableList.of("10.3333333333333333","12.0000000000000000", "13.0000000000000000");
      }
  
      @Override
      protected ImmutableList<String> getExpectedValuesAvgStudents3() {
          return ImmutableList.of("0", "0", "0", "0", "0", "10.3333333333333333", "12.0000000000000000", "13.0000000000000000");
      }
  
  }
  