code: package it.unibz.inf.ontop.owlapi;
  
  import org.junit.*;
  
  /**
   * Checks that that SLICE does not distribute over UNION (reproduces a bug).
   */
  public class SliceOverUnionDistribution extends AbstractOWLAPITest {
  
      @BeforeClass
      public static void setUp() throws Exception {
          initOBDA("/slice/create.sql",
                  "/slice/university.obda",
                  "/slice/university.ttl");
      }
  
      @AfterClass
      public static void tearDown() throws Exception {
          release();
      }
  
      @Test
      public void testQuery() throws Exception {
          String query = "PREFIX : <http://example.org/voc#>\n" +
                  "PREFIX foaf: <http://xmlns.com/foaf/0.1/>\n" +
                  "\n" +
                  "SELECT ?person ?name WHERE {\n" +
                  "    ?person foaf:lastName ?name .\n" +
                  "    {\n" +
                  "        SELECT ?person WHERE { ?person rdf:type :Teacher . } LIMIT 1\n" +
                  "    }\n" +
                  "}";
          checkNumberOfReturnedValues(query, 1);
      }
  }
  