anchor.diff:              )),
               update(2, [<<"r2">>, <<"r1">>], P1, provider(<<"diginet rulz">>)),
               update(3, [<<"r2">>, <<"r1">>], U1,
  -                user(<<"onedata ftw">>, [], [S1])
  +                user(<<"onedata ftw">>, [], [S1], S1)
               )
           ]),
           expect_message([U1], 3, [])
  
positive.code:                 <<"space_name">>, [], [], [{P1, 1000}]
              )),
              update(2, [<<"r2">>, <<"r1">>], P1, provider(<<"diginet rulz">>)),
              update(3, [<<"r2">>, <<"r1">>], U1, user(<<"onedata">>, [], [])),
              update(4, [<<"r2">>, <<"r1">>], G1, group(<<"onedata_gr">>, [], [{U1, Priv1}]))
          ]),
          expect_message([U1], 4, []),
  
negative.code:                 <<"space_name">>, [], [], [{P1, 1000}]
              )),
              update(2, [<<"r2">>, <<"r1">>], P1, provider(<<"diginet rulz">>)),
              update(3, [<<"r2">>, <<"r1">>], U1, user(<<"onedata">>, [], [], undefined)),
              update(4, [<<"r2">>, <<"r1">>], G1, group(<<"onedata_gr">>, [S1], []))
          ]),
          expect_message([U1], 4, []),
  