anchor.diff:      % given
       [Node | _] = ?config(oz_worker_nodes, Config),
       P1 = create_provider(Node, ?ID(p1), []),
  -    save_user(Node, ?ID(u1), [], []),
  +    U1 = #onedata_user{name = <<"u1">>},
  +    save(Node, ?ID(u1), U1),
       Rev0 = get_rev(Node, onedata_user, ?ID(u1)),
  -    call_worker(Node, {add_connection, P1, self()}),
   
       % when
       Context = init_messages(Node, P1, []),
  
positive.code: 
      % then
      verify_messages_absent(Context, [
          user_expectation(?ID(u1), <<"updated">>)
      ]),
      ok.
  
  
negative.code: 
      % then
      verify_messages_present(Context, [
          expectation(?ID(u1), U1#onedata_user{name = <<"updated4">>})
      ]),
      ok.
  
  