t = db.updatec;
t.drop();

t.update({"_id": 123}, {$set: {"v": {"i": 123, "a": 456}}, $push: {"f": 234}}, 1, 0);
t.update({"_id": 123}, {$set: {"v": {"i": 123, "a": 456}}, $push: {"f": 234}}, 1, 0);

assert.docEq({"_id": 123, "f": [234, 234], "v": {"i": 123, "a": 456}}, t.findOne());