@Test
public void testNullEdit() {

	Statement s1 = StatementBuilder.forSubjectAndProperty(Q1, P1)
			.withValue(Q1).withId("ID-s1").build();
	Statement s1dup = StatementBuilder.forSubjectAndProperty(Q1, P1)
			.withValue(Q1).build();
	Statement s2 = StatementBuilder.forSubjectAndProperty(Q1, P1)
			.withValue(Q1).withId("ID-s2").build();
	
	ItemDocument currentDocument = ItemDocumentBuilder.forItemId(Q1)
			.withStatement(s1).build();
	
	StatementUpdate su = new StatementUpdate(currentDocument,
			Collections.singletonList(s1dup), Collections.singletonList(s2));
	assertTrue(su.isEmptyEdit());
	
}