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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, take_test/0, fold_test/0, map_test/0, filter_test/0, repeat_test/0, cycle_test/0, unfold_test/0, range_test/0, drop_test/0]).
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]).
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]).
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,
F1 = fun(E, Acc1) -> [E | Acc1] end,
Test([], [], F1),
Test([1], [], F1),
Test([1, 2, 3], [], F1),
Test([1, 2, 3, 4, 5, 6, 7, 8], [], F1).
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,
F1 = fun(E) -> E * 2 end,
Test([], F1),
Test([1], F1),
Test([1, 2, 3], F1),
Test([1, 2, 3, 4, 5, 6, 7, 8], F1).
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).
repeat_test() ->
gleam@should:equal(
gleam@iterator:take(gleam@iterator:repeat(1), 5),
[1, 1, 1, 1, 1]
).
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]
).
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;
N1 ->
{next, N1, N1 - 1}
end end)),
[5, 4, 3, 2, 1]
).
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]).
drop_test() ->
gleam@should:equal(
gleam@iterator:to_list(
gleam@iterator:drop(gleam@iterator:range(0, 10), 5)
),
[5, 6, 7, 8, 9]
).