@Test
public void testItemDocumentToJson() {

	ItemDocument id = Datamodel.makeItemDocument(
			Datamodel.makeWikidataItemIdValue("Q42"),
			Collections.emptyList(),
			Collections.emptyList(),
			Collections.emptyList(),
			Collections.emptyList(),
			Collections.emptyMap());
	String json = "{\"type\":\"item\",\"id\":\"Q42\",\"labels\":{},\"descriptions\":{},\"aliases\":{},\"claims\":{},\"sitelinks\":{}}";
	JsonComparator.compareJsonStrings(json, JsonSerializer.getJsonString(id));
}