Gallery g2 = fetchGallery();
assertEquals(2, g2.getPaintingArray().size());
Painting p2 = (Painting) g2.getPaintingArray().get(0);
// *** TESTING THIS ***
g2.removeFromPaintingArray(p2);
// test before save
assertEquals(1, g2.getPaintingArray().size());
assertNull(p2.getToGallery());