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-rw-r--r--lib/stdlib/test/lists_SUITE.erl42
1 files changed, 40 insertions, 2 deletions
diff --git a/lib/stdlib/test/lists_SUITE.erl b/lib/stdlib/test/lists_SUITE.erl
index 6bed793028..a0f7fd2744 100644
--- a/lib/stdlib/test/lists_SUITE.erl
+++ b/lib/stdlib/test/lists_SUITE.erl
@@ -62,7 +62,7 @@
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,
- suffix/1, subtract/1, droplast/1]).
+ suffix/1, subtract/1, droplast/1, hof/1]).
%% Sort randomized lists until stopped.
%%
@@ -123,7 +123,8 @@ groups() ->
{tickets, [parallel], [otp_5939, otp_6023, otp_6606, otp_7230]},
{zip, [parallel], [zip_unzip, zip_unzip3, zipwith, zipwith3]},
{misc, [parallel], [reverse, member, dropwhile, takewhile,
- filter_partition, suffix, subtract]}
+ filter_partition, suffix, subtract,
+ hof]}
].
init_per_suite(Config) ->
@@ -2708,3 +2709,40 @@ droplast(Config) when is_list(Config) ->
?line {'EXIT', {function_clause, _}} = (catch lists:droplast(x)),
ok.
+
+%% Briefly test the common high-order functions to ensure they
+%% are covered.
+hof(Config) when is_list(Config) ->
+ L = [1,2,3],
+ [1,4,9] = lists:map(fun(N) -> N*N end, L),
+ [1,4,5,6] = lists:flatmap(fun(1) -> [1];
+ (2) -> [];
+ (3) -> [4,5,6]
+ end, L),
+ [{1,[a]},{2,[b]},{3,[c]}] =
+ lists:keymap(fun(A) -> [A] end, 2, [{1,a},{2,b},{3,c}]),
+
+ [1,3] = lists:filter(fun(N) -> N rem 2 =:= 1 end, L),
+ FilterMapFun = fun(1) -> true;
+ (2) -> {true,42};
+ (3) -> false
+ end,
+ [1,42] = lists:filtermap(FilterMapFun, L),
+ [1,42] = lists:zf(FilterMapFun, L),
+
+ [3,2,1] = lists:foldl(fun(E, A) -> [E|A] end, [], L),
+ [1,2,3] = lists:foldr(fun(E, A) -> [E|A] end, [], L),
+ {[1,4,9],[3,2,1]} = lists:mapfoldl(fun(E, A) ->
+ {E*E,[E|A]}
+ end, [], L),
+ {[1,4,9],[1,2,3]} = lists:mapfoldr(fun(E, A) ->
+ {E*E,[E|A]}
+ end, [], L),
+
+ true = lists:any(fun(N) -> N =:= 2 end, L),
+ false = lists:any(fun(N) -> N =:= 42 end, L),
+
+ true = lists:all(fun(N) -> is_integer(N) end, L),
+ false = lists:all(fun(N) -> N rem 2 =:= 0 end, L),
+
+ ok.