### Question:
JPAEdmReferentialConstraint extends JPAEdmBaseViewImpl implements JPAEdmReferentialConstraintView { @Override public JPAEdmBuilder getBuilder() { if (builder == null) { builder = new JPAEdmRefConstraintBuilder(); } return builder; } JPAEdmReferentialConstraint(final JPAEdmAssociationView associationView,
      final JPAEdmEntityTypeView entityTypeView, final JPAEdmPropertyView propertyView); @Override JPAEdmBuilder getBuilder(); @Override ReferentialConstraint getEdmReferentialConstraint(); @Override boolean isExists(); @Override String getEdmRelationShipName();  }### Answer:
@Test public void testGetBuilder() { assertNotNull(objJPAEdmReferentialConstraint.getBuilder()); }
@Test public void testGetBuilderIdempotent() { JPAEdmBuilder builder1 = objJPAEdmReferentialConstraint.getBuilder(); JPAEdmBuilder builder2 = objJPAEdmReferentialConstraint.getBuilder(); assertEquals(builder1.hashCode(), builder2.hashCode()); }