// there should be only one with properties on properties
final VertexProperty propertyOnProperty = propertyX.stream().filter(p -> p.iterators().propertyIterator().hasNext()).findAny().get();
assertEquals("a", propertyOnProperty.iterators().propertyIterator("propX1a").next().value());
assertEquals(1, propertyOnProperty.iterators().propertyIterator("propX11").next().value());
assertEquals(123.01d, propertyOnProperty.iterators().propertyIterator("same").next().value());
assertEquals("something", propertyOnProperty.iterators().propertyIterator("extra").next().value());
assertEquals(4, StreamFactory.stream(propertyOnProperty.iterators().propertyIterator()).count());
assertEquals("ha", propertyOnProperty.iterators().hiddenPropertyIterator("propX1ha").next().value());
assertEquals(11, propertyOnProperty.iterators().hiddenPropertyIterator("propX1h1").next().value());
assertEquals(321.01d, propertyOnProperty.iterators().hiddenPropertyIterator("same").next().value());
assertEquals(3, StreamFactory.stream(propertyOnProperty.iterators().hiddenPropertyIterator()).count());