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-rw-r--r--lib/stdlib/test/lists_SUITE.erl33
1 files changed, 31 insertions, 2 deletions
diff --git a/lib/stdlib/test/lists_SUITE.erl b/lib/stdlib/test/lists_SUITE.erl
index 175eb29af9..c84b4d9a5d 100644
--- a/lib/stdlib/test/lists_SUITE.erl
+++ b/lib/stdlib/test/lists_SUITE.erl
@@ -62,7 +62,8 @@
zip_unzip/1, zip_unzip3/1, zipwith/1, zipwith3/1,
filter_partition/1,
otp_5939/1, otp_6023/1, otp_6606/1, otp_7230/1,
- prefix/1, suffix/1, subtract/1, droplast/1, hof/1]).
+ prefix/1, suffix/1, subtract/1, droplast/1, hof/1,
+ split/1]).
%% Sort randomized lists until stopped.
%%
@@ -124,7 +125,7 @@ groups() ->
{zip, [parallel], [zip_unzip, zip_unzip3, zipwith, zipwith3]},
{misc, [parallel], [reverse, member, dropwhile, takewhile,
filter_partition, prefix, suffix, subtract,
- hof]}
+ hof, split]}
].
init_per_suite(Config) ->
@@ -2759,3 +2760,31 @@ hof(Config) when is_list(Config) ->
false = lists:all(fun(N) -> N rem 2 =:= 0 end, L),
ok.
+
+%% Test lists:split/2
+split(Config) when is_list(Config) ->
+ Lens = lists:seq(0, 32),
+ do_split(Lens),
+
+ %% Error cases.
+ {'EXIT',_} = (catch lists:split(a, [])),
+ {'EXIT',_} = (catch lists:split(-1, [])),
+ {'EXIT',_} = (catch lists:split(0, {a,b})),
+ ok.
+
+do_split([Len|Lens]) ->
+ List = [rand:uniform(1000) || _ <- lists:seq(1, Len)],
+ do_split_1(0, Len, List),
+ do_split(Lens);
+do_split([]) ->
+ ok.
+
+do_split_1(N, Len, List) when N =:= Len + 1 ->
+ {'EXIT',_} = (catch lists:split(N, List));
+do_split_1(N, Len, List) ->
+ {A,B} = lists:split(N, List),
+ List = A ++ B,
+ N = length(A),
+ LenB = length(B),
+ LenB = Len - N,
+ do_split_1(N+1, Len, List).