anchor.diff:  
   -record(state, {url, props}).
   
  -property_test_() -> {timeout, 60000, {setup, fun() ->
  +browser_test_() -> {setup, fun() ->
   			application:start(cowboy),
   			HostPort = {<<"localhost">>, 9093},
   			cowboy:start_listener(handle_map_tests, 1,
  
positive.code: 				name = <<"Batman">>
  			},
  			{ok, User1} = rpgb_data:save(User),
  			{ok, Session3} = rpgb_session:set_user(User, Session2)
  	end,
  	fun(_) ->
  		meck:unload(rpgb_data)
  
negative.code: 	]).
  
  g_opacity() ->
  	?LET(N, int(), case N of 0 -> 0.0; _ -> 1 / abs(N) end).
  
  g_color_rgb() ->
  	[R,B,G,_] = g_color_rgba(),
  