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Add a PropEr test for cowboy_dispatcher:split_host/1

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Mostly thanks to Magnus Klaar as it took me a while to figure
out how PropEr tests had to be written.
This commit is contained in:
Loïc Hoguin 2011-07-26 10:46:06 +02:00
parent 503a0c7662
commit e5d4c1f22f
4 changed files with 109 additions and 2 deletions
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68
test/dispatcher_prop.erl Normal file
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%% Copyright (c) 2011, Magnus Klaar <magnus.klaar@gmail.com>
%% Copyright (c) 2011, Loïc Hoguin <essen@dev-extend.eu>
%%
%% Permission to use, copy, modify, and/or distribute this software for any
%% purpose with or without fee is hereby granted, provided that the above
%% copyright notice and this permission notice appear in all copies.
%%
%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-module(dispatcher_prop).
-include_lib("proper/include/proper.hrl").
%% Generators.
hostname_head_char() ->
oneof([choose($a, $z), choose($A, $Z), choose($0, $9)]).
hostname_char() ->
oneof([choose($a, $z), choose($A, $Z), choose($0, $9), $-]).
hostname_label() ->
?SUCHTHAT(Label, [hostname_head_char()|list(hostname_char())],
length(Label) < 64).
hostname() ->
?SUCHTHAT(Hostname,
?LET(Labels, list(hostname_label()), string:join(Labels, ".")),
length(Hostname) > 0 andalso length(Hostname) =< 255).
port_number() ->
choose(1, 16#ffff).
port_str() ->
oneof(["", ?LET(Port, port_number(), ":" ++ integer_to_list(Port))]).
server() ->
?LET({Hostname, PortStr}, {hostname(), port_str()},
list_to_binary(Hostname ++ PortStr)).
%% Properties.
prop_split_host_symmetric() ->
?FORALL(Server, server(),
begin case cowboy_dispatcher:split_host(Server) of
{Tokens, RawHost, undefined} ->
(Server == RawHost) and (Server == binary_join(Tokens, "."));
{Tokens, RawHost, Port} ->
PortBin = (list_to_binary(":" ++ integer_to_list(Port))),
(Server == << RawHost/binary, PortBin/binary >>)
and (Server == << (binary_join(Tokens, "."))/binary,
PortBin/binary >>)
end end).
%% Internal.
%% Contributed by MononcQc on #erlounge.
binary_join(Flowers, Leaf) ->
case Flowers of
[] -> <<>>;
[Petal|Pot] -> iolist_to_binary(
[Petal | [[Leaf | Pollen] || Pollen <- Pot]])
end.

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test/proper_SUITE.erl Normal file
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%% Copyright (c) 2011, Loïc Hoguin <essen@dev-extend.eu>
%%
%% Permission to use, copy, modify, and/or distribute this software for any
%% purpose with or without fee is hereby granted, provided that the above
%% copyright notice and this permission notice appear in all copies.
%%
%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-module(proper_SUITE).
-include_lib("common_test/include/ct.hrl").
-export([all/0, groups/0]). %% ct.
-export([dispatcher_split_host/1]). %% cowboy_dispatcher.
%% ct.
all() ->
[{group, dispatcher}].
groups() ->
[{dispatcher, [], [dispatcher_split_host]}].
%% cowboy_dispatcher.
dispatcher_split_host(_Config) ->
true = proper:quickcheck(dispatcher_prop:prop_split_host_symmetric(),
[{on_output, fun(Format, Data) ->
io:format(user, Format, Data), %% Console.
io:format(Format, Data) %% Logs.
end}]).