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gleam_stdlib
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retired
A standard library for the Gleam programming language
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gen/test/gleam@iterator_test.erl
-module(gleam@iterator_test).
-compile(no_auto_import).
-export([to_from_list_test/0, step_test/0, take_test/0, fold_test/0, map_test/0, flat_map_test/0, append_test/0, flatten_test/0, filter_test/0, repeat_test/0, cycle_test/0, unfold_test/0, range_test/0, drop_test/0, find_test/0]).
-export_type([cat/0]).
-type cat() :: {cat, integer()}.
-spec to_from_list_test() -> gleam@should:expectation().
to_from_list_test() ->
Test = fun(Subject) ->
gleam@should:equal(
gleam@iterator:to_list(gleam@iterator:from_list(Subject)),
Subject
)
end,
Test([]),
Test([1]),
Test([1, 2]),
Test([1, 2, 4, 8]).
-spec step_test() -> gleam@should:expectation().
step_test() ->
Test = fun(Subject) ->
Step = gleam@iterator:step(gleam@iterator:from_list(Subject)),
case Subject of
[] ->
gleam@should:equal(Step, done);
[H | T] ->
gleam@should:equal(Step, {next, H, gleam@iterator:from_list(T)})
end
end,
Test([]),
Test([1]),
Test([1, 2]),
Test([1, 2, 3]).
-spec take_test() -> gleam@should:expectation().
take_test() ->
Test = fun(N, Subject) ->
gleam@should:equal(
gleam@iterator:take(gleam@iterator:from_list(Subject), N),
gleam@list:take(Subject, N)
)
end,
Test(0, []),
Test(1, []),
Test(-1, []),
Test(0, [0]),
Test(1, [0]),
Test(-1, [0]),
Test(0, [0, 1, 2, 3, 4]),
Test(1, [0, 1, 2, 3, 4]),
Test(2, [0, 1, 2, 3, 4]),
Test(22, [0, 1, 2, 3, 4]).
-spec fold_test() -> gleam@should:expectation().
fold_test() ->
Test = fun(Subject, Acc, F) ->
gleam@should:equal(
gleam@iterator:fold(gleam@iterator:from_list(Subject), Acc, F),
gleam@list:fold(Subject, Acc, F)
)
end,
F@1 = fun(E, Acc@1) -> [E | Acc@1] end,
Test([], [], F@1),
Test([1], [], F@1),
Test([1, 2, 3], [], F@1),
Test([1, 2, 3, 4, 5, 6, 7, 8], [], F@1).
-spec map_test() -> gleam@should:expectation().
map_test() ->
Test = fun(Subject, F) ->
gleam@should:equal(
gleam@iterator:to_list(
gleam@iterator:map(gleam@iterator:from_list(Subject), F)
),
gleam@list:map(Subject, F)
)
end,
F@1 = fun(E) -> E * 2 end,
Test([], F@1),
Test([1], F@1),
Test([1, 2, 3], F@1),
Test([1, 2, 3, 4, 5, 6, 7, 8], F@1).
-spec flat_map_test() -> gleam@should:expectation().
flat_map_test() ->
Test = fun(Subject, F) ->
gleam@should:equal(
gleam@iterator:to_list(
gleam@iterator:flat_map(gleam@iterator:from_list(Subject), F)
),
gleam@list:flatten(
gleam@list:map(
gleam@list:map(Subject, F),
fun gleam@iterator:to_list/1
)
)
)
end,
F@1 = fun(I) -> gleam@iterator:range(I, I + 2) end,
Test([], F@1),
Test([1], F@1),
Test([1, 2], F@1).
-spec append_test() -> gleam@should:expectation().
append_test() ->
Test = fun(Left, Right) ->
gleam@should:equal(
gleam@iterator:to_list(
gleam@iterator:append(
gleam@iterator:from_list(Left),
gleam@iterator:from_list(Right)
)
),
gleam@list:flatten([Left, Right])
)
end,
Test([], []),
Test([1], [2]),
Test([1, 2], [3, 4]).
-spec flatten_test() -> gleam@should:expectation().
flatten_test() ->
Test = fun(Lists) ->
gleam@should:equal(
gleam@iterator:to_list(
gleam@iterator:flatten(
gleam@iterator:from_list(
gleam@list:map(Lists, fun gleam@iterator:from_list/1)
)
)
),
gleam@list:flatten(Lists)
)
end,
Test([[], []]),
Test([[1], [2]]),
Test([[1, 2], [3, 4]]).
-spec filter_test() -> gleam@should:expectation().
filter_test() ->
Test = fun(Subject, F) ->
gleam@should:equal(
gleam@iterator:to_list(
gleam@iterator:filter(gleam@iterator:from_list(Subject), F)
),
gleam@list:filter(Subject, F)
)
end,
Even = fun(X) -> (X rem 2) =:= 0 end,
Test([], Even),
Test([1], Even),
Test([1, 2], Even),
Test([1, 2, 3], Even),
Test([1, 2, 3, 4], Even),
Test([1, 2, 3, 4, 5], Even),
Test([1, 2, 3, 4, 5, 6], Even).
-spec repeat_test() -> gleam@should:expectation().
repeat_test() ->
gleam@should:equal(
gleam@iterator:take(gleam@iterator:repeat(1), 5),
[1, 1, 1, 1, 1]
).
-spec cycle_test() -> gleam@should:expectation().
cycle_test() ->
gleam@should:equal(
gleam@iterator:take(
gleam@iterator:cycle(gleam@iterator:from_list([1, 2, 3])),
9
),
[1, 2, 3, 1, 2, 3, 1, 2, 3]
).
-spec unfold_test() -> gleam@should:expectation().
unfold_test() ->
gleam@should:equal(
gleam@iterator:take(
gleam@iterator:unfold(2, fun(Acc) -> {next, Acc, Acc * 2} end),
5
),
[2, 4, 8, 16, 32]
),
gleam@should:equal(
gleam@iterator:take(gleam@iterator:unfold(2, fun(_) -> done end), 5),
[]
),
gleam@should:equal(
gleam@iterator:to_list(gleam@iterator:unfold(5, fun(N) -> case N of
0 ->
done;
N@1 ->
{next, N@1, N@1 - 1}
end end)),
[5, 4, 3, 2, 1]
).
-spec range_test() -> gleam@should:expectation().
range_test() ->
Test = fun(A, B, Expected) ->
gleam@should:equal(
gleam@iterator:to_list(gleam@iterator:range(A, B)),
Expected
)
end,
Test(0, 0, []),
Test(1, 1, []),
Test(-1, -1, []),
Test(0, 1, [0]),
Test(0, 5, [0, 1, 2, 3, 4]),
Test(1, -5, [1, 0, -1, -2, -3, -4]).
-spec drop_test() -> gleam@should:expectation().
drop_test() ->
gleam@should:equal(
gleam@iterator:to_list(
gleam@iterator:drop(gleam@iterator:range(0, 10), 5)
),
[5, 6, 7, 8, 9]
).
-spec find_test() -> gleam@should:expectation().
find_test() ->
gleam@should:equal(
gleam@iterator:find(gleam@iterator:range(0, 10), fun(E) -> E =:= 5 end),
{ok, 5}
),
gleam@should:equal(
gleam@iterator:find(
gleam@iterator:range(0, 10),
fun(E@1) -> E@1 > 10 end
),
{error, nil}
),
gleam@should:equal(
gleam@iterator:find(gleam@iterator:from_list([]), fun(_) -> true end),
{error, nil}
),
gleam@should:equal(
gleam@iterator:find(
gleam@iterator:unfold(
{cat, 1},
fun(Cat) -> {next, Cat, {cat, erlang:element(2, Cat) + 1}} end
),
fun(Cat@1) -> erlang:element(2, Cat@1) =:= 10 end
),
{ok, {cat, 10}}
).