diff options
Diffstat (limited to 'lib/stdlib/test/lists_SUITE.erl')
-rw-r--r-- | lib/stdlib/test/lists_SUITE.erl | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/lib/stdlib/test/lists_SUITE.erl b/lib/stdlib/test/lists_SUITE.erl index af94fc79bc..5dab6f6697 100644 --- a/lib/stdlib/test/lists_SUITE.erl +++ b/lib/stdlib/test/lists_SUITE.erl @@ -158,6 +158,20 @@ append_2(Config) when is_list(Config) -> "abcdef"=lists:append("abc", "def"), [hej, du]=lists:append([hej], [du]), [10, [elem]]=lists:append([10], [[elem]]), + + %% Trapping, both crashing and otherwise. + [append_trapping_1(N) || N <- lists:seq(0, 20)], + + ok. + +append_trapping_1(N) -> + List = lists:duplicate(N + (1 bsl N), gurka), + ImproperList = List ++ crash, + + {'EXIT',_} = (catch (ImproperList ++ [])), + + [3, 2, 1 | List] = lists:reverse(List ++ [1, 2, 3]), + ok. %% Tests the lists:reverse() implementation. The function is @@ -2597,6 +2611,20 @@ subtract(Config) when is_list(Config) -> {'EXIT',_} = (catch sub([a|b], [])), {'EXIT',_} = (catch sub([a|b], [a])), + %% Trapping, both crashing and otherwise. + [sub_trapping(N) || N <- lists:seq(0, 18)], + + %% The current implementation chooses which algorithm to use based on + %% certain thresholds, and we need proper coverage for all corner cases. + [sub_thresholds(N) || N <- lists:seq(0, 32)], + + %% Trapping, both crashing and otherwise. + [sub_trapping(N) || N <- lists:seq(0, 18)], + + %% The current implementation chooses which algorithm to use based on + %% certain thresholds, and we need proper coverage for all corner cases. + [sub_thresholds(N) || N <- lists:seq(0, 32)], + ok. sub_non_matching(A, B) -> @@ -2606,6 +2634,41 @@ sub(A, B) -> Res = A -- B, Res = lists:subtract(A, B). +sub_trapping(N) -> + List = lists:duplicate(N + (1 bsl N), gurka), + ImproperList = List ++ crash, + + {'EXIT',_} = (catch sub_trapping_1(ImproperList, [])), + {'EXIT',_} = (catch sub_trapping_1(List, ImproperList)), + + List = List -- lists:duplicate(N + (1 bsl N), gaffel), + ok = sub_trapping_1(List, []). + +sub_trapping_1([], _) -> ok; +sub_trapping_1(L, R) -> sub_trapping_1(L -- R, [gurka | R]). + +sub_thresholds(N) -> + %% This needs to be long enough to cause trapping. + OtherLen = 1 bsl 18, + Other = lists:seq(0, OtherLen - 1), + + Disjoint = lists:seq(-N, -1), + Subset = lists:seq(1, N), + + %% LHS is disjoint from RHS, so all elements must be retained. + Disjoint = Disjoint -- Other, + + %% LHS is covered by RHS, so all elements must be removed. + [] = Subset -- Other, + + %% RHS is disjoint from LHS, so all elements must be retained. + Other = Other -- Disjoint, + + %% RHS is covered by LHS, so N elements must be removed. + N = OtherLen - length(Other -- Subset), + + ok. + %% Test lists:droplast/1 droplast(Config) when is_list(Config) -> [] = lists:droplast([x]), |