@Test
 public void testJoinFilters() {
   String expected = " specialSign.owner = dancer.id";
   String obtained = BOTH.joinFiltersToString(FACTORY);
   assertNotNull("BOTH.joinFilters(FACTORY) NULL", obtained);
   assertEquals("BOTH.joinFilters(FACTORY) KO", expected, obtained);
 }
 @Test
 public void testFilters() {
   String expected = "specialSign.type = 'freckles' AND specialSign.location = 'censored'";
   String obtained = BOTH.filters(FACTORY);
   assertNotNull("BOTH.filters(FACTORY) NULL", obtained);
   assertEquals("BOTH.filters(FACTORY) KO", expected, obtained);
 }
 @Test
 public void testEntities() {
   String expected = ", SpecialSign specialSign";
   String obtained = BOTH.entities(FACTORY);
   assertNotNull("BOTH.entities(FACTORY) NULL", obtained);
   assertEquals("BOTH.entities(FACTORY) KO", expected, obtained);
 }