anchor.diff:  	SizeBin1 = size(AttrsBin1),
   	<<AttrsBin1:SizeBin1/binary, ?PortLimit, 6, 1:32>> = AttrsBin2.
   
  -fetch_existing() ->
  +fetch_exist() ->
   	[{userdata, [{doc, "Get the value of an existing attribute"}]}].
   
  -fetch_existing(Config) ->
  +fetch_exist(Config) ->
   	AttrsBin = ?config(example_attributes, Config),
   	Attrs = radius_attributes:codec(AttrsBin),
   	"wlan0" = radius_attributes:fetch(?NasPortId, Attrs).
  
positive.code: 	SizeBin1 = size(AttrsBin1),
  	<<AttrsBin1:SizeBin1/binary, ?NasPortType, 6, 19:32>> = AttrsBin2.
  
  store_overwrite() ->
  	[{userdata, [{doc, "Overwrite an existing attribute value"}]}].
  
  store_overwrite(Config) ->
  	AttrsBin1 = ?config(example_attributes, Config),
  	Attrs1 = radius_attributes:codec(AttrsBin1),
  	Attrs2 = radius_attributes:store(?NasPort, 17, Attrs1),
  
negative.code: 			ok
  	end.
  
  find_exist() ->
  	[{userdata, [{doc, "Look for the value of an existing attribute"}]}].
  
  find_exist(Config) ->
  	AttrsBin = ?config(example_attributes, Config),
  	Attrs = radius_attributes:codec(AttrsBin),
  	{ok, "wlan0"} = radius_attributes:find(?NasPortId, Attrs).
  