%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2000-2010. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
-module(random_SUITE).
-export([all/0,groups/0,init_per_group/2,end_per_group/2]).
-export([interval_1/1, seed0/1, seed/1]).
-export([init_per_testcase/2, end_per_testcase/2]).
-include_lib("test_server/include/test_server.hrl").
% Default timetrap timeout (set in init_per_testcase).
-define(default_timeout, ?t:minutes(1)).
init_per_testcase(_Case, Config) ->
?line Dog = ?t:timetrap(?default_timeout),
[{watchdog, Dog} | Config].
end_per_testcase(_Case, Config) ->
Dog = ?config(watchdog, Config),
test_server:timetrap_cancel(Dog),
ok.
all() ->
[interval_1, seed0, seed].
groups() ->
[].
init_per_group(_GroupName, Config) ->
Config.
end_per_group(_GroupName, Config) ->
Config.
seed0(doc) ->
["Test that seed is set implicitly, and always the same."];
seed0(suite) ->
[];
seed0(Config) when is_list(Config) ->
?line Self = self(),
?line _ = spawn(fun() -> Self ! random:uniform() end),
?line F1 = receive
Fa -> Fa
end,
?line _ = spawn(fun() -> random:seed(),
Self ! random:uniform() end),
?line F2 = receive
Fb -> Fb
end,
?line F1 = F2,
ok.
seed(doc) ->
["Test that seed/1 and seed/3 is equivalent."];
seed(suite) ->
[];
seed(Config) when is_list(Config) ->
?line Self = self(),
?line Seed = {S1, S2, S3} = now(),
?line _ = spawn(fun() ->
random:seed(S1,S2,S3),
Rands = lists:foldl(fun
(_, Out) -> [random:uniform(10000)|Out]
end, [], lists:seq(1,100)),
Self ! {seed_test, Rands}
end),
?line Rands1 = receive {seed_test, R1s} -> R1s end,
?line _ = spawn(fun() ->
random:seed(Seed),
Rands = lists:foldl(fun
(_, Out) -> [random:uniform(10000)|Out]
end, [], lists:seq(1,100)),
Self ! {seed_test, Rands}
end),
?line Rands2 = receive {seed_test, R2s} -> R2s end,
?line Rands1 = Rands2,
ok.
interval_1(doc) ->
["Check that uniform/1 returns values within the proper interval."];
interval_1(suite) ->
[];
interval_1(Config) when is_list(Config) ->
?line Top = 7,
?line N = 10,
?line check_interval(N, Top),
ok.
check_interval(0, _) -> ok;
check_interval(N, Top) ->
X = random:uniform(Top),
if
X < 1 ->
test_server:fail(too_small);
X > Top ->
test_server:fail(too_large);
true ->
ok
end,
check_interval(N-1, Top).
