p1.setPaintingTitle("1");
a1.addToPaintingArray(p1);
Painting p2 = context.newObject(Painting.class);
p2.setPaintingTitle("2");
a1.addToPaintingArray(p2);
// test before save
assertEquals(2, a1.getPaintingArray().size());
assertSame(a1, p1.getToArtist());
assertSame(a1, p2.getToArtist());