async def METHOD_NAME(backend, alice, alice_ws, realm):
    await backend.vlob.create(
        organization_id=alice.organization_id,
        author=alice.device_id,
        realm_id=realm,
        encryption_revision=1,
        vlob_id=VLOB_ID,
        timestamp=NOW,
        blob=b"v1",
    )
    await backend.vlob.update(
        organization_id=alice.organization_id,
        author=alice.device_id,
        encryption_revision=1,
        vlob_id=VLOB_ID,
        version=2,
        timestamp=NOW,
        blob=b"v2",
    )
    for last_checkpoint in (0, 1):
        rep = await vlob_poll_changes(alice_ws, realm, last_checkpoint)
        assert rep == VlobPollChangesRepOk({VLOB_ID: 2}, 2)