### Question:
NullIndividualHelper implements IndividualHelper { @Override public PropertyHelper property(URI propertyId) { return new NullPropertyHelper(propertyId); }  @Override Set<URI> types(); @Override PropertyHelper property(URI propertyId); @Override PropertyHelper property(String propertyId); @Override PropertyHelper property(Term property);  }### Answer:
@Test public void testPropertyURI() throws Exception { assertThat(sut.property(RDFS.LABEL.as(URI.class)),instanceOf(NullPropertyHelper.class)); }
@Test public void testPropertyString() throws Exception { assertThat(sut.property(RDFS.LABEL.qualifiedEntityName()),instanceOf(NullPropertyHelper.class)); }
@Test public void testPropertyTerm() throws Exception { assertThat(sut.property(RDFS.LABEL),instanceOf(NullPropertyHelper.class)); }