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Diffstat (limited to 'erts/emulator/test/iovec_SUITE.erl')
| -rw-r--r-- | erts/emulator/test/iovec_SUITE.erl | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/erts/emulator/test/iovec_SUITE.erl b/erts/emulator/test/iovec_SUITE.erl new file mode 100644 index 0000000000..49dc64b0d2 --- /dev/null +++ b/erts/emulator/test/iovec_SUITE.erl @@ -0,0 +1,176 @@ +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 2017. All Rights Reserved. +%% +%% Licensed under the Apache License, Version 2.0 (the "License"); +%% you may not use this file except in compliance with the License. +%% You may obtain a copy of the License at +%% +%% http://www.apache.org/licenses/LICENSE-2.0 +%% +%% Unless required by applicable law or agreed to in writing, software +%% distributed under the License is distributed on an "AS IS" BASIS, +%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +%% See the License for the specific language governing permissions and +%% limitations under the License. +%% +%% %CopyrightEnd% +%% + +-module(iovec_SUITE). + +-export([all/0, suite/0, init_per_suite/1, end_per_suite/1]). + +-export([integer_lists/1, binary_lists/1, empty_lists/1, empty_binary_lists/1, + mixed_lists/1, improper_lists/1, illegal_lists/1, cons_bomb/1, + sub_binary_lists/1, iolist_to_iovec_idempotence/1, + iolist_to_iovec_correctness/1]). + +-include_lib("common_test/include/ct.hrl"). + +suite() -> + [{ct_hooks,[ts_install_cth]}, + {timetrap, {minutes, 2}}]. + +all() -> + [integer_lists, binary_lists, empty_lists, empty_binary_lists, mixed_lists, + sub_binary_lists, illegal_lists, improper_lists, cons_bomb, + iolist_to_iovec_idempotence, iolist_to_iovec_correctness]. + +init_per_suite(Config) -> + Config. + +end_per_suite(Config) -> + application:stop(os_mon), + Config. + +integer_lists(Config) when is_list(Config) -> + Variations = gen_variations([I || I <- lists:seq(1, 255)]), + equivalence_test(fun erlang:iolist_to_iovec/1, Variations). + +sub_binary_lists(Config) when is_list(Config) -> + Parent = <<0:256/unit:8, "gazurka">>, + <<0:196/unit:8, Child/binary>> = Parent, + equivalence_test(fun erlang:iolist_to_iovec/1, gen_variations(Child)). + +binary_lists(Config) when is_list(Config) -> + Variations = gen_variations([<<I:8>> || I <- lists:seq(1, 255)]), + equivalence_test(fun erlang:iolist_to_iovec/1, Variations). + +empty_lists(Config) when is_list(Config) -> + Variations = gen_variations([[] || _ <- lists:seq(1, 256)]), + equivalence_test(fun erlang:iolist_to_iovec/1, Variations), + [] = erlang:iolist_to_iovec([]), + ok. + +empty_binary_lists(Config) when is_list(Config) -> + Variations = gen_variations([<<>> || _ <- lists:seq(1, 8192)]), + equivalence_test(fun erlang:iolist_to_iovec/1, Variations), + [] = erlang:iolist_to_iovec(Variations), + ok. + +mixed_lists(Config) when is_list(Config) -> + Variations = gen_variations([<<>>, lists:seq(1, 40), <<12, 45, 78>>]), + equivalence_test(fun erlang:iolist_to_iovec/1, Variations). + +illegal_lists(Config) when is_list(Config) -> + BitStrs = gen_variations(["gurka", <<1:1>>, "gaffel"]), + BadInts = gen_variations(["gurka", 890, "gaffel"]), + Atoms = gen_variations([gurka, "gaffel"]), + BadTails = [["test" | 0], ["gurka", gaffel]], + + Variations = + BitStrs ++ BadInts ++ Atoms ++ BadTails, + + illegality_test(fun erlang:iolist_to_iovec/1, Variations). + +improper_lists(Config) when is_list(Config) -> + Variations = [ + [[[[1 | <<2>>] | <<3>>] | <<4>>] | <<5>>], + [[<<1>>, 2] | <<3, 4, 5>>], + [1, 2, 3 | <<4, 5>>] + ], + equivalence_test(fun erlang:iolist_to_iovec/1, Variations). + +cons_bomb(Config) when is_list(Config) -> + IntBase = gen_variations([I || I <- lists:seq(1, 255)]), + BinBase = gen_variations([<<I:8>> || I <- lists:seq(1, 255)]), + MixBase = gen_variations([<<12, 45, 78>>, lists:seq(1, 255)]), + + Rounds = + case system_mem_size() of + Mem when Mem >= (16 bsl 30) -> 32; + Mem when Mem >= (3 bsl 30) -> 28; + _ -> 20 + end, + + Variations = gen_variations([IntBase, BinBase, MixBase], Rounds), + equivalence_test(fun erlang:iolist_to_iovec/1, Variations). + +iolist_to_iovec_idempotence(Config) when is_list(Config) -> + IntVariations = gen_variations([I || I <- lists:seq(1, 255)]), + BinVariations = gen_variations([<<I:8>> || I <- lists:seq(1, 255)]), + MixVariations = gen_variations([<<12, 45, 78>>, lists:seq(1, 255)]), + + Variations = [IntVariations, BinVariations, MixVariations], + Optimized = erlang:iolist_to_iovec(Variations), + + true = Optimized =:= erlang:iolist_to_iovec(Optimized), + ok. + +iolist_to_iovec_correctness(Config) when is_list(Config) -> + IntVariations = gen_variations([I || I <- lists:seq(1, 255)]), + BinVariations = gen_variations([<<I:8>> || I <- lists:seq(1, 255)]), + MixVariations = gen_variations([<<12, 45, 78>>, lists:seq(1, 255)]), + + Variations = [IntVariations, BinVariations, MixVariations], + Optimized = erlang:iolist_to_iovec(Variations), + + true = is_iolist_equal(Optimized, Variations), + ok. + +illegality_test(Fun, Variations) -> + [{'EXIT',{badarg, _}} = (catch Fun(Variation)) || Variation <- Variations], + ok. + +equivalence_test(Fun, [Head | _] = Variations) -> + %% Check that each variation is equal to the others, and that the sum of + %% them is equal to the input. + Comparand = Fun(Head), + [true = is_iolist_equal(Comparand, Fun(V)) || V <- Variations], + true = is_iolist_equal(Variations, Fun(Variations)), + ok. + +is_iolist_equal(A, B) -> + iolist_to_binary(A) =:= iolist_to_binary(B). + +%% Generates a bunch of lists whose contents will be equal to Base repeated a +%% few times. The lists only differ by their structure, so their reduction to +%% a simpler format should yield the same result. +gen_variations(Base) -> + gen_variations(Base, 16). +gen_variations(Base, N) -> + [gen_flat_list(Base, N), + gen_nested_list(Base, N), + gen_nasty_list(Base, N)]. + +gen_flat_list(Base, N) -> + lists:flatten(gen_nested_list(Base, N)). + +gen_nested_list(Base, N) -> + [Base || _ <- lists:seq(1, N)]. + +gen_nasty_list(Base, N) -> + gen_nasty_list_1(gen_nested_list(Base, N), []). +gen_nasty_list_1([], Result) -> + Result; +gen_nasty_list_1([Head | Base], Result) when is_list(Head) -> + gen_nasty_list_1(Base, [[Result], [gen_nasty_list_1(Head, [])]]); +gen_nasty_list_1([Head | Base], Result) -> + gen_nasty_list_1(Base, [[Result], [Head]]). + +system_mem_size() -> + application:ensure_all_started(os_mon), + {Tot,_Used,_} = memsup:get_memory_data(), + Tot. |