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-module(list_test).
-compile(no_auto_import).

-export([length_test/0, reverse_test/0, is_empty_test/0, contains_test/0, head_test/0, tail_test/0, filter_test/0, map_test/0, traverse_test/0, drop_test/0, take_test/0, new_test/0, append_test/0, flatten_test/0, fold_test/0, fold_right_test/0, find_test/0, all_test/0]).

length_test() ->
    expect:equal(list:length([]), 0),
    expect:equal(list:length([1]), 1),
    expect:equal(list:length([1, 1]), 2),
    expect:equal(list:length([1, 1, 1]), 3).

reverse_test() ->
    expect:equal(list:reverse([]), []),
    expect:equal(list:reverse([1, 2, 3, 4, 5]), [5, 4, 3, 2, 1]).

is_empty_test() ->
    expect:true(list:is_empty([])),
    expect:false(list:is_empty([1])).

contains_test() ->
    expect:true(list:contains([0, 4, 5, 1], 1)),
    expect:false(list:contains([0, 4, 5, 7], 1)),
    expect:false(list:contains([], 1)).

head_test() ->
    expect:equal(list:head([0, 4, 5, 7]), {ok, 0}),
    expect:is_error(list:head([])).

tail_test() ->
    expect:equal(list:tail([0, 4, 5, 7]), {ok, [4, 5, 7]}),
    expect:equal(list:tail([0]), {ok, []}),
    expect:is_error(list:tail([])).

filter_test() ->
    expect:equal(list:filter([], fun(_) -> true end), []),
    expect:equal(list:filter([0, 4, 5, 7, 3], fun(_) -> true end),
                 [0, 4, 5, 7, 3]),
    expect:equal(list:filter([0, 4, 5, 7, 3], fun(X) -> X > 4 end), [5, 7]),
    expect:equal(list:filter([0, 4, 5, 7, 3], fun(X) -> X < 4 end), [0, 3]).

map_test() ->
    expect:equal(list:map([], fun(X) -> X * 2 end), []),
    expect:equal(list:map([0, 4, 5, 7, 3], fun(X) -> X * 2 end),
                 [0, 8, 10, 14, 6]).

traverse_test() ->
    Fun = fun(X) -> case X =:= 6 orelse X =:= 5 orelse X =:= 4 of
            true ->
                {ok, X * 2};

            false ->
                {error, X}
        end end,
    expect:equal(list:traverse([5, 6, 5, 6], Fun), {ok, [10, 12, 10, 12]}),
    expect:equal(list:traverse([4, 6, 5, 7, 3], Fun), {error, 7}).

drop_test() ->
    expect:equal(list:drop([], 5), []),
    expect:equal(list:drop([1, 2, 3, 4, 5, 6, 7, 8], 5), [6, 7, 8]).

take_test() ->
    expect:equal(list:take([], 5), []),
    expect:equal(list:take([1, 2, 3, 4, 5, 6, 7, 8], 5), [1, 2, 3, 4, 5]).

new_test() ->
    expect:equal(list:new(), []).

append_test() ->
    expect:equal(list:append([1], [2, 3]), [1, 2, 3]).

flatten_test() ->
    expect:equal(list:flatten([]), []),
    expect:equal(list:flatten([[]]), []),
    expect:equal(list:flatten([[], [], []]), []),
    expect:equal(list:flatten([[1, 2], [], [3, 4]]), [1, 2, 3, 4]).

fold_test() ->
    expect:equal(list:fold([1, 2, 3], [], fun(X, Acc) -> [X | Acc] end),
                 [3, 2, 1]).

fold_right_test() ->
    expect:equal(list:fold_right([1, 2, 3], [], fun(X, Acc) -> [X | Acc] end),
                 [1, 2, 3]).

find_test() ->
    F = fun(X) -> case X of
            2 ->
                {ok, 4};

            _ ->
                {error, 0}
        end end,
    expect:equal(list:find([1, 2, 3], F), {ok, 4}),
    expect:equal(list:find([1, 3, 2], F), {ok, 4}),
    expect:is_error(list:find([1, 3], F)).

all_test() ->
    expect:equal(list:all([1, 2, 3, 4, 5], fun(X) -> X > 0 end), true),
    expect:equal(list:all([1, 2, 3, 4, 5], fun(X) -> X < 0 end), false),
    expect:equal(list:all([], fun(_) -> false end), true).