diff options
| -rw-r--r-- | lib/stdlib/test/lists_SUITE.erl | 42 |
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. |